Femoral Neck and Shaft Fractures: Epidemiology, Surgical Anatomy & Biomechanics of Isolated & Ipsilateral Injuries

Introduction & Epidemiology

Femoral shaft and neck fractures represent distinct entities in orthopedic trauma, each demanding precise diagnosis and meticulous management to prevent significant morbidity and mortality. While often discussed separately due to anatomical and biomechanical differences, their potential for simultaneous occurrence (ipsilateral femoral neck and shaft fractures) necessitates a comprehensive evaluative approach, highlighting the "Don't Miss It" imperative. These injuries are associated with substantial societal and economic burdens due to prolonged hospitalization, rehabilitation, and potential for long-term disability.

Femoral Neck Fractures:
These injuries are characterized by a bimodal distribution. In younger patients, they typically result from high-energy trauma (e.g., motor vehicle collisions, falls from height) and are often associated with polytrauma. In the elderly, low-energy falls on osteoporotic bone are the predominant mechanism. The critical concern in femoral neck fractures, particularly displaced ones, is the disruption of the tenuous blood supply to the femoral head, predisposing to avascular necrosis (AVN) and nonunion. This makes timely diagnosis and appropriate surgical management paramount.

Femoral Shaft Fractures:
Femoral shaft fractures are predominantly high-energy injuries, common in young, active individuals involved in vehicular trauma, falls, or sports. They are frequently associated with significant soft tissue injury, substantial blood loss (often 1-2 liters internally), and a high incidence of concomitant injuries (e.g., head trauma, abdominal trauma, thoracic trauma, or ipsilateral lower extremity injuries forming a "floating knee"). In the elderly, pathological fractures or low-energy falls can also cause femoral shaft fractures, often with a different fracture pattern. The primary goals of treatment include restoration of length, alignment, and rotation, with early mobilization to prevent complications associated with prolonged recumbency.

Ipsilateral Femoral Neck and Shaft Fractures:
This rare but critical combination injury, often described as an "unhappy triad" when associated with knee ligamentous injury, occurs in approximately 2-6% of femoral shaft fractures. The femoral neck component can be subtle or initially missed, leading to delayed diagnosis and potentially devastating complications such as nonunion or AVN of the femoral head. A high index of suspicion and thorough diagnostic imaging are essential for optimal outcomes.

Surgical Anatomy & Biomechanics

Understanding the intricate anatomy and biomechanics of the femur is fundamental to effective surgical planning and execution for both neck and shaft fractures.

Femoral Neck Anatomy and Biomechanics

The femoral neck connects the femoral head to the shaft, angling superiorly, anteriorly, and medially. Its unique architecture makes it susceptible to shear and bending forces.

• Vascularity: The blood supply to the femoral head is predominantly extraskeletal, derived from the medial and lateral femoral circumflex arteries, which form an arterial ring at the base of the femoral neck. From this ring, retinacular arteries ascend along the femoral neck within the capsular reflections (especially the superior and inferior retinacular arteries of Weitbrecht). The artery of the ligamentum teres (a branch of the obturator artery) provides a variable, often minor, contribution to the superior portion of the femoral head, particularly important in children. Displacement of a femoral neck fracture, especially Garden III and IV patterns, can severely compromise these retinacular vessels, leading to ischemia and AVN.
• Bone Structure: The femoral neck consists of cancellous bone, with distinct trabecular systems: the primary compressive group (medial head to calcar femorale), primary tensile group (lateral head to greater trochanter), and secondary compressive and tensile groups. The Ward's triangle, an area of relatively sparse trabeculae, is particularly vulnerable in osteoporotic bone.
• Biomechanics: The femoral neck is subjected to significant compressive and tensile forces during weight-bearing. Its oblique orientation relative to the shaft creates shear stresses. The Pauwels classification quantifies the angle of the fracture line relative to the horizontal, directly correlating with the shear forces and prognosis for nonunion (Pauwels I: <30°, Pauwels II: 30-50°, Pauwels III: >50°). Higher Pauwels angles indicate greater shear forces and poorer prognosis with internal fixation. The Garden classification, on the other hand, describes the degree of displacement and impaction, which is critical for assessing vascular compromise.

Femoral Shaft Anatomy and Biomechanics

The femoral shaft is the longest and strongest bone in the body, primarily composed of dense cortical bone designed to withstand substantial axial, bending, and torsional loads.

• Muscle Anatomy and Deforming Forces:
  • Proximal Fragment: Abducted and externally rotated by the gluteus medius and minimus, and piriformis/obturator externus respectively. Flexed by the iliopsoas.
  • Distal Fragment: Adducted by the adductor musculature and flexed by the gastrocnemius.
  • Overall: These powerful muscles create significant deforming forces that make closed reduction challenging and often dictate the need for surgical intervention to restore alignment.
• Neurovascular Structures: The femoral artery and vein, along with the femoral nerve, lie anteriorly in the adductor canal, while the sciatic nerve is posterior. Surgical approaches must protect these vital structures.
• Biomechanics: The femur acts as a lever arm for muscle action and transmits forces from the pelvis to the tibia. Its cylindrical shape provides optimal resistance to bending and torsional stresses. Fracture patterns (transverse, oblique, spiral, comminuted) reflect the type and magnitude of forces applied. Transverse fractures often result from direct bending forces, while spiral fractures indicate torsional forces. Comminuted fractures signify high-energy impact.

Indications & Contraindications

The management of femoral neck and shaft fractures is predominantly surgical, with specific indications and contraindications guiding the choice of procedure.

Femoral Neck Fractures

Indications for Operative Management:
* Nearly all femoral neck fractures: Due to the risk of nonunion and AVN, even nondisplaced fractures in active patients are often stabilized.
* Displaced fractures in young patients (<60-65 years): Urgent anatomical reduction and stable internal fixation (e.g., cannulated screws, dynamic hip screw) to preserve the femoral head.
* Displaced fractures in elderly, low-demand patients: Hemiarthroplasty (bipolar or unipolar) or total hip arthroplasty (THA) for pre-existing hip pathology or high-demand individuals.
* Nondisplaced/impacted fractures in young, active patients: Internal fixation (e.g., multiple cannulated screws) to ensure stability and allow early mobilization.
* Pathological fractures: Biopsy and fixation, often with adjunctive cement.

Relative Contraindications for Operative Management (Internal Fixation of Femoral Neck):
* Severe comminution making stable internal fixation impossible.
* Extreme osteoporosis where hardware purchase is insufficient.
* Severe medical comorbidities precluding surgery (rare, as even debilitated patients benefit from pain relief and nursing care).
* Pre-existing severe degenerative hip disease (favoring arthroplasty).

Femoral Shaft Fractures

Indications for Operative Management:
* Nearly all adult femoral shaft fractures: Intramedullary (IM) nailing is the gold standard due to superior biomechanics, high union rates, and early weight-bearing.
* Open fractures: Requires debridement, stabilization, and antibiotic therapy.
* Pathological fractures: Often requires IM nailing with cement augmentation.
* Polytrauma patients: Early stabilization (damage control orthopedics) reduces systemic complications.
* Associated injuries: Ipsilateral neck fracture, floating knee, proximal/distal extension making plating or different IM nail crucial.

Relative Contraindications for Operative Management (IM Nailing of Femoral Shaft):
* Hemodynamic instability or severe medical comorbidities: In severe polytrauma, external fixation may be chosen as a temporizing measure (damage control orthopedics) prior to definitive nailing.
* Active infection at the intended entry site.
* Severe open fractures (Gustilo-Anderson Type IIIC): Initial external fixation to allow for soft tissue healing and vascular repair before definitive nailing.
* Pneumatic splint: While not a contraindication, it's a temporary measure for transport, not definitive treatment.

Summary Table: Operative vs. Non-Operative Indications

Pre-Operative Planning & Patient Positioning

Thorough pre-operative planning is crucial for optimizing outcomes, minimizing complications, and ensuring efficient surgical execution.

Pre-Operative Planning

1. Clinical Assessment:

   • ATLS Protocol: For high-energy trauma, follow Advanced Trauma Life Support guidelines. Assess ABCs, identify life-threatening injuries, and stabilize the patient.
   • Neurological Exam: Document pre-operative neurological status, particularly for the sciatic and femoral nerves.
   • Vascular Exam: Assess distal pulses and perfusion. For high-energy femoral shaft fractures, consider ankle-brachial index (ABI) or Doppler ultrasound if vascular injury is suspected.
   • Skin and Soft Tissues: Inspect for open wounds, abrasions, or degloving injuries. Document Gustilo-Anderson classification for open fractures.
   • Associated Injuries: Systematically evaluate for other injuries, especially in polytrauma. A "floating knee" (ipsilateral femoral shaft and tibial shaft fractures) or ipsilateral femoral neck fracture must be ruled out.

2. Imaging:

   • X-rays:
     • Femoral Neck: Standard AP and lateral views of the hip. Crucially, a true lateral view of the proximal femur is often missed and vital for assessing displacement. Obtain a full-length femur AP and lateral to rule out shaft fractures.
     • Femoral Shaft: Full-length AP and lateral views of the entire femur, including the hip and knee joints, to identify ipsilateral neck or supracondylar fractures. Traction views can aid in assessing comminution and reducibility.
   • CT Scan:
     • Femoral Neck: Essential for diagnosing occult fractures (when X-rays are negative but clinical suspicion is high), evaluating comminution, and assessing articular extension.
     • Femoral Shaft: Useful for complex comminuted patterns, assessing cortical defects, or pre-operative templating, especially for distal or proximal metadiaphyseal fractures.
   • MRI: The gold standard for detecting occult femoral neck fractures, often used when CT is equivocal or unavailable, particularly in young patients with persistent groin pain after trauma.
   • Angiography: Indicated if there's suspicion of vascular injury in open or severely displaced fractures.

   
   Figure 1: Critical imaging for femoral fractures. Note the full-length femoral views to assess for ipsilateral injuries and the detail required for hip anatomy.

3. Templating:

   • Femoral Neck (Arthroplasty): Use templates to determine appropriate component size, offset, and stem length.
   • Femoral Shaft (IM Nailing): Measure contralateral femur for nail length and diameter. Pre-bend reamers on X-ray, if necessary, for specific sagittal plane deformities.

4. Timing of Surgery:

   • Femoral Neck: Displaced fractures in young patients are orthopedic emergencies; fixation within 6 hours significantly reduces AVN risk.
   • Femoral Shaft: Early fixation within 24 hours (damage control orthopedics principles applied for unstable polytrauma patients) reduces pulmonary complications and mortality.

Patient Positioning

1. Femoral Neck Fractures:

   • Supine on a radiolucent table: Most common for cannulated screw fixation or dynamic hip screw. Allows for easy C-arm access.
   • Lateral decubitus: For hemiarthroplasty or THA, often on a beanbag. This position provides excellent exposure for posterolateral or direct lateral approaches.

2. Femoral Shaft Fractures:

   • Supine on a fracture table: The most common approach for antegrade IM nailing. Provides continuous traction for length restoration and C-arm access. Careful padding of perineum and contralateral leg is crucial to prevent pressure sores or nerve palsies. The ipsilateral foot is often placed in a traction boot.
   • Supine on a radiolucent table: Used for retrograde IM nailing, plating, or if a fracture table is contraindicated or unavailable. Requires manual traction or external fixator as a temporary reduction aid.
   • Lateral decubitus: Occasionally used for specific plating approaches, but less common for IM nailing.

Key considerations for Positioning:
* Reduction: Ensure the ability to achieve and maintain reduction with positioning.
* C-arm Access: Critical for intra-operative fluoroscopy to confirm reduction, guide hardware placement, and assess alignment.
* Neurovascular Protection: Meticulous padding and careful limb manipulation to prevent iatrogenic nerve or vascular injury.
* Sterility: Ensure wide sterile field and proper draping.

Detailed Surgical Approach / Technique

Surgical techniques for femoral neck and shaft fractures vary significantly based on fracture morphology, patient age, bone quality, and surgeon preference. The following outlines general principles and common approaches.

Femoral Neck Fractures

1. Closed Reduction and Internal Fixation (CRPP & Cannulated Screws)

• Indications: Nondisplaced or minimally displaced fractures (Garden I, II, III impacted) in physiologically young, active patients.
• Patient Positioning: Supine on a radiolucent table or fracture table.
• Reduction Maneuver (for displaced fractures): Apply longitudinal traction, internal rotation (to correct external rotation deformity), and slight abduction (to correct adduction). Confirm reduction with AP and lateral fluoroscopy. Assess for adequate restoration of Garden alignment and Pauwels angle. A perfectly anatomical reduction is the goal for young patients.
• Approach:
  • Percutaneous: Two to three small incisions over the lateral proximal femur.
• Technique:
  1. Guide Wire Placement: Insert 2-3 parallel guide wires across the fracture site into the femoral head. Aim for maximum spread within the head (inverted triangle configuration on AP, centered on lateral). Wires should enter the femoral head subchondrally for optimal fixation, avoiding articular penetration.
  2. Screw Selection: Typically, 6.5mm or 7.3mm cannulated partially threaded screws are used. Screw length is critical.
  3. Screw Insertion: Predrill through the lateral cortex if bicortical purchase is desired. Insert screws over guide wires, ensuring appropriate depth and compression across the fracture site. Lag technique provides compression.
  4. Confirm Fixation: AP and lateral fluoroscopy to confirm screw position, fracture reduction, and stability.
• Pearls:
  • Ensure true AP and lateral views during reduction and guide wire placement.
  • Avoid excessive internal rotation to prevent anterior capsular impingement.
  • The inferior-posterior screw provides the most biomechanical stability against shear forces.

2. Hemiarthroplasty or Total Hip Arthroplasty (THA)

• Indications: Displaced fractures (Garden III, IV) in elderly, low-demand patients (hemiarthroplasty) or active elderly patients with pre-existing degenerative hip disease (THA).
• Patient Positioning: Lateral decubitus, often on a beanbag, for posterolateral or direct lateral approach. Supine for anterior approach.
• Approach:
  • Posterolateral Approach (Kocher-Langenbeck): Incision centered over the greater trochanter, extending proximally and distally. Incise the fascia lata. Develop the internervous plane between the gluteus maximus (supplied by inferior gluteal nerve) and the gluteus medius/minimus (supplied by superior gluteal nerve). Externally rotate the leg, detach piriformis and short external rotators (gemelli, obturators) from the greater trochanter. Incise the posterior capsule.
  • Direct Lateral Approach (Hardinge): Incision centered over the greater trochanter. Split the tensor fascia lata in line with its fibers. Reflect the vastus lateralis anteriorly. The gluteus medius and minimus are often partially split or detached from the greater trochanter. Incise the capsule.
• Technique (Hemiarthroplasty):
  1. Femoral Head Excision: Dislocate the hip, osteotomize the femoral neck at the desired level (typically 1 cm above the lesser trochanter).
  2. Femoral Canal Preparation: Progressively ream the femoral canal, then broach to match the chosen prosthetic stem.
  3. Trial Reduction: Insert trial stem and head to assess leg length, stability, and range of motion.
  4. Implant Insertion: Insert the definitive femoral stem (cemented or uncemented) and prosthetic head.
  5. Capsular Repair/Rotator Reattachment: Repair posterior capsule and reattach external rotators to enhance stability.

Femoral Shaft Fractures

1. Intramedullary (IM) Nailing

• Indications: Gold standard for nearly all adult femoral shaft fractures (transverse, oblique, spiral, comminuted).
• Patient Positioning: Supine on a fracture table or radiolucent table with traction.
• Reduction Maneuver: Apply strong longitudinal traction to restore length. Manipulation of the fracture fragments with external maneuvers (e.g., ball spike pushers, manual pressure) or a temporary external fixator as a reduction aid. Fluoroscopy confirms reduction in both AP and lateral planes. Ensure rotational alignment is correct (e.g., compare patellar position, contralateral leg).
• Approaches:
  • Antegrade IM Nailing:
    • Piriformis Fossa Entry: Traditionally the gold standard. Incision curvilinear or longitudinal starting from tip of greater trochanter, extending proximally. Split gluteus medius fibers. Use an awl to open piriformis fossa.
    • Greater Trochanteric Entry (Trochanteric Entry Nail): More common now. Incision at or slightly anterior to the tip of the greater trochanter. Advantages include easier access in obese patients, less abductor injury, potentially better for proximal fractures.
  • Retrograde IM Nailing:
    • Indications: Ipsilateral femoral neck fracture, ipsilateral tibial fracture (floating knee), morbid obesity, pregnancy, polytrauma patients requiring multiple surgeries in supine position, very distal shaft fractures.
    • Approach: Medial parapatellar or lateral parapatellar incision, entering the knee joint. Entry portal is typically in the intercondylar notch, slightly anterior to Blumensaat's line.
• Technique (Antegrade, Reamed Nailing):
  1. Entry Portal: Create appropriate entry portal (piriformis or greater trochanteric) using an awl.
  2. Reaming: Pass a guide wire across the fracture into the distal fragment. Over-ream the canal incrementally by 1-2mm larger than the chosen nail diameter. Reaming clears the canal and provides cancellous bone graft.
  3. Nail Insertion: Insert the IM nail over the guide wire. Gentle blows, ensuring the fracture is continuously reduced. The nail should pass just distal to the fracture site initially, then be driven across.
  4. Proximal Locking: Lock proximally (typically 2 screws) to control rotation and prevent shortening.
  5. Distal Locking: Lock distally (1 or 2 screws) using a targeting device or freehand technique with fluoroscopy. This secures the fracture in length and rotation.
  6. Confirm Fixation: Full-length AP and lateral fluoroscopy to confirm length, alignment, and rotation.
• Pearls:
  • Avoid varus malalignment at the entry site, especially with piriformis entry.
  • Ensure anatomical reduction before reaming and nailing.
  • Careful guide wire placement is critical to avoid articular penetration or malalignment.
  • Polytrauma patients may benefit from unreamed nails initially to reduce the systemic inflammatory response.
  • Ipsilateral femoral neck and shaft fractures often require fixation of the neck first, then the shaft, using either a reconstructive IM nail or separate constructs.

2. Plate Fixation

• Indications: Select cases where IM nailing is unsuitable: very proximal or distal metadiaphyseal fractures, pediatric fractures (avoiding physeal damage), ipsilateral neck and shaft fractures (if nailing contraindicated for neck), articular extension, severe comminution with large segmental defects, or when IM nailing fails.
• Approaches:
  • Lateral Approach (Direct Lateral or Minimally Invasive): Incision on the lateral thigh. Split vastus lateralis muscle to expose the femur.
  • Anterolateral Approach: Incision centered on the anterior border of the greater trochanter, extending distally. Identify and protect the interval between rectus femoris and vastus lateralis (internervous plane).
• Technique:
  1. Exposure & Reduction: Expose the fracture site. Achieve anatomical reduction of length, alignment, and rotation. Use reduction clamps, temporary external fixators, or lag screws.
  2. Plate Application: Select an appropriately sized locked compression plate (LCP) or dynamic compression plate (DCP). Apply the plate as a bridging osteosynthesis (for comminuted fractures) or a compression plate (for simple patterns).
  3. Screw Insertion: Insert screws through the plate, ensuring adequate cortical purchase. For LCPs, fixed-angle locking screws provide angular stability, important in osteoporotic bone.
  4. Confirm Fixation: AP and lateral fluoroscopy or X-rays to confirm reduction and stable fixation.
• Pearls:
  • Minimally invasive plate osteosynthesis (MIPO) can reduce soft tissue stripping and improve biological healing, especially for bridging comminuted fractures.
  • Protect the vastus lateralis innervation.
  • The choice between plating and nailing depends on fracture location and morphology.

Complications & Management

Complications following femoral neck and shaft fractures can be severe, ranging from minor hardware-related issues to life-threatening systemic events. Early recognition and appropriate management are crucial.

Femoral Neck Fractures

| Complication | Incidence (%) | Salvage Strategy
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Introduction & Epidemiology

Fractures of the femur, encompassing both the femoral neck and shaft, represent a critical domain in orthopedic trauma due due to their association with high morbidity, prolonged functional recovery, and potential life-threatening complications. These distinct yet sometimes concomitant injuries demand swift and precise diagnosis, judicious surgical planning, and meticulous operative execution. This comprehensive review highlights essential considerations for orthopedic surgeons, residents, and medical students in managing these significant fractures.

Femoral fractures typically present with a bimodal epidemiological distribution. In younger, physiologically active individuals, these injuries are predominantly the result of high-energy trauma, such as motor vehicle collisions, industrial accidents, or significant falls from height. These patients often present with multiple associated injuries (polytrauma), necessitating an Advanced Trauma Life Support (ATLS) approach and a high index of suspicion for concurrent pathology. Conversely, in the elderly population, femoral fractures are overwhelmingly associated with low-energy mechanisms, primarily ground-level falls in the context of underlying osteoporosis. This demographic experiences elevated risks for medical comorbidities, complications related to prolonged immobility, and mortality.

Femoral Neck Fractures:
These injuries are intracapsular and occur in the subcapital, transcervical, or basicervical regions. Their unique anatomy and tenuous vascular supply to the femoral head make them particularly challenging. The incidence of femoral neck fractures is significantly higher in the elderly due to osteoporosis, with women being affected more often than men. Approximately half of all hip fractures involve the femoral neck. In younger patients, while less common, femoral neck fractures result from substantial trauma and carry a higher risk of complications if not anatomically reduced and stably fixed due to the implications for future hip function.

Femoral Shaft Fractures:
The femoral shaft, being the largest and strongest bone in the body, typically fractures under extreme force. As such, these are predominantly high-energy injuries, with motor vehicle accidents accounting for a substantial proportion. The incidence is highest in young males. Femoral shaft fractures are often associated with significant blood loss (estimates range from 1 to 2 liters internally) and a high rate of concomitant injuries (20-60%), including head injuries, abdominal and thoracic trauma, and ipsilateral lower extremity injuries (e.g., knee ligamentous injury or a "floating knee" with an ipsilateral tibial fracture). Open femoral shaft fractures are also common due to the high-energy mechanism, complicating management and increasing infection risk.

Ipsilateral Femoral Neck and Shaft Fractures:
This specific combination, occurring in approximately 2-6% of femoral shaft fractures, presents a diagnostic and therapeutic challenge. The femoral neck component is often subtle or initially overshadowed by the more obvious shaft injury, leading to a missed diagnosis in up to 30-50% of cases upon initial presentation. A missed or delayed diagnosis of a displaced femoral neck fracture in this context significantly increases the risk of avascular necrosis (AVN) and nonunion, with devastating consequences for the patient. Therefore, comprehensive imaging and a heightened awareness are paramount.

Surgical Anatomy & Biomechanics

A profound understanding of the surgical anatomy and biomechanics of the femur is the cornerstone of effective management for both neck and shaft fractures. This knowledge guides surgical approaches, implant selection, and prognostication.

Femoral Neck Anatomy and Biomechanics

The femoral neck is a critical region connecting the femoral head to the shaft, characterized by its unique angulation and vulnerability to vascular compromise.

• Vascular Supply: The arterial supply to the femoral head is predominantly extraskeletal. The medial and lateral femoral circumflex arteries (branches of the profunda femoris artery) form an anastomotic ring at the base of the femoral neck, beneath the joint capsule. From this ring, retinacular arteries (specifically the superior, inferior, anterior, and posterior retinacular arteries of Weitbrecht ) ascend along the femoral neck, piercing the synovial membrane and capsule to supply the femoral head. The most crucial of these are the superior and inferior retinacular arteries. The artery of the ligamentum teres (a branch of the obturator artery) provides a variable, often minor, contribution to the superior portion of the femoral head, particularly significant in children. Displacement of a femoral neck fracture, especially in the subcapital and transcervical regions, frequently disrupts these retinacular vessels, leading to ischemia and subsequent avascular necrosis (AVN) of the femoral head.
• Bone Structure: The femoral neck consists of cancellous bone with a complex trabecular architecture designed to transmit loads. Key trabecular systems include the primary compressive group (extending from the medial cortex of the femoral shaft to the superomedial aspect of the femoral head and calcar femorale), the primary tensile group (extending from the lateral cortex of the shaft to the superolateral aspect of the femoral head), and secondary groups. The Ward's triangle , an area of relatively sparse trabeculae in the central femoral neck, is particularly susceptible to fracture in osteoporotic bone.
• Biomechanics: The femoral neck is subjected to significant compressive, tensile, and shear forces during weight-bearing. Its characteristic anteversion (average 10-20 degrees) and inclination (neck-shaft angle, average 125-135 degrees) influence load transmission.
  • Garden Classification: This widely used classification system for femoral neck fractures in adults describes the degree of displacement and impaction, directly correlating with the likelihood of vascular disruption and AVN:
    • Garden I: Incomplete fracture, valgus impacted.
    • Garden II: Complete, nondisplaced fracture.
    • Garden III: Complete fracture, partially displaced (typically varus, with intact posterior retinaculum).
    • Garden IV: Complete fracture, fully displaced (no cortical contact).
  • Pauwels Classification: This system classifies femoral neck fractures based on the angle of the fracture line relative to the horizontal, reflecting the magnitude of shear forces:
    • Pauwels I: <30 degrees (low shear).
    • Pauwels II: 30-50 degrees (moderate shear).
    • Pauwels III: >50 degrees (high shear).
      Higher Pauwels angles are associated with increased instability and a greater risk of nonunion with internal fixation, often requiring more stable constructs or arthroplasty.

Femoral Shaft Anatomy and Biomechanics

The femoral shaft is a robust diaphysis designed to withstand substantial axial, bending, and torsional loads, often failing only under high-energy trauma.

• Muscle Attachments and Deforming Forces: The powerful muscles surrounding the femur create characteristic deforming forces on fracture fragments, making closed reduction challenging.
  • Proximal Fragment: Flexed by the iliopsoas, abducted by the gluteus medius and minimus, and externally rotated by the short external rotators (piriformis, obturators, gemelli, quadratus femoris).
  • Distal Fragment: Adducted by the adductor musculature and flexed by the gastrocnemius (especially in supracondylar fractures).
  • Overall: These forces can lead to significant shortening, angular deformity (varus/valgus), and rotational malalignment if not appropriately controlled.
• Neurovascular Structures: The major neurovascular bundle (femoral artery, femoral vein, femoral nerve) lies anteromedially, superficial to the adductor musculature in the adductor canal. Posteriorly, the sciatic nerve traverses the posterior thigh. Surgical approaches and fracture manipulation must meticulously protect these critical structures.
• Bone Structure and Biomechanics: The femoral shaft is composed primarily of dense cortical bone, providing immense strength. The canal is relatively wide proximally and distally, narrowing in the isthmus. Fracture patterns often indicate the mechanism of injury:
  • Transverse fractures: Direct bending forces.
  • Oblique fractures: Combination of axial and bending forces.
  • Spiral fractures: Torsional forces.
  • Comminuted fractures: High-energy impact, often with significant soft tissue injury.
  • Segmental fractures: Rare, high-energy injury with two distinct fracture lines isolating a segment of bone.
• Gustilo-Anderson Classification: For open femoral shaft fractures, this classification guides management based on wound size, soft tissue damage, and contamination.

Indications & Contraindications

The management of femoral neck and shaft fractures is predominantly operative, with non-operative treatment reserved for highly selected cases. The choice of surgical technique depends on patient factors, fracture morphology, and associated injuries.

Femoral Neck Fractures

Indications for Operative Management:

1. Nearly all femoral neck fractures in physiologically active patients: Due to the high risk of nonunion and avascular necrosis (AVN) with non-operative treatment, even nondisplaced or minimally displaced fractures are typically stabilized.
2. Displaced fractures (Garden III/IV) in young patients (<60-65 years): Urgent anatomical reduction and stable internal fixation (e.g., multiple cannulated screws, dynamic hip screw with derotation screw). The goal is to preserve the native femoral head. Surgery should ideally be performed within 6 hours of injury to minimize AVN risk.
3. Nondisplaced or minimally displaced fractures (Garden I/II) in young, active patients: Internal fixation (typically multiple cannulated screws) to prevent secondary displacement and allow early mobilization.
4. Displaced fractures (Garden III/IV) in elderly, low-demand patients (often >75 years or with significant comorbidities): Hemiarthroplasty (bipolar or unipolar) is generally preferred for its predictable outcomes, earlier mobilization, and lower re-operation rates compared to internal fixation.
5. Displaced fractures (Garden III/IV) in active elderly patients (physiologically <75 years) or those with pre-existing symptomatic hip pathology (e.g., osteoarthritis): Total Hip Arthroplasty (THA) offers better long-term functional outcomes and lower re-operation rates than hemiarthroplasty for this subgroup.
6. Pathological fractures: Requires stabilization, often with adjunctive cement, and biopsy for definitive diagnosis.

Relative Contraindications for Operative Management (Internal Fixation of Femoral Neck):

• Severe comminution of the femoral neck, precluding stable internal fixation.
• Extreme osteoporosis where hardware purchase is insufficient (favoring arthroplasty).
• Severe medical comorbidities that genuinely preclude any surgical intervention (rare, as even debilitated patients benefit from pain relief and nursing care with arthroplasty).
• Pre-existing severe degenerative hip disease: (absolute indication for THA).
• Significant delay to surgery (>24-48 hours) for displaced fractures in young patients: While still fixable, the AVN risk is significantly elevated, and surgeon judgment regarding outcomes is critical.

Femoral Shaft Fractures

Indications for Operative Management:

1. Nearly all adult femoral shaft fractures: Intramedullary (IM) nailing is the gold standard, offering superior biomechanics, high union rates, and allowing early weight-bearing and mobilization.
2. Open fractures: Requires urgent surgical debridement, stabilization (often IM nail), and aggressive antibiotic therapy.
3. Pathological fractures: IM nailing, frequently with cement augmentation, is necessary to prevent further collapse and provide stability.
4. Polytrauma patients: Early stabilization (within 24 hours, often with damage control orthopedics principles) reduces systemic complications such as fat embolism syndrome and acute respiratory distress syndrome (ARDS).
5. Associated injuries: Ipsilateral femoral neck fracture, ipsilateral tibial fracture ("floating knee"), or significant articular extension into the knee or hip joint may influence the choice of fixation (e.g., retrograde IM nail for floating knee, plates for articular extension, reconstructive nail for ipsilateral neck/shaft).
6. Failed non-operative management: While rare, if a highly selected non-operative case fails, surgical intervention becomes indicated.

Relative Contraindications for Operative Management (IM Nailing of Femoral Shaft):

• Hemodynamic instability or severe medical comorbidities: In severe polytrauma, external fixation may be chosen as a temporizing measure (damage control orthopedics) until the patient is physiologically stable for definitive nailing.
• Active infection at the intended entry site for IM nailing.
• Severe open fractures (Gustilo-Anderson Type IIIC): Initial external fixation to allow for comprehensive soft tissue debridement, vascular repair, and stabilization of soft tissues before definitive IM nailing.
• Intramedullary canal too narrow for available nails (rare, may require plating or reaming).
• Extreme proximal or distal metaphyseal extension where intramedullary nails may not provide optimal fixation or control, potentially favoring plate fixation.

Summary Table: Operative vs. Non-Operative Indications

Pre-Operative Planning & Patient Positioning

Meticulous pre-operative planning and appropriate patient positioning are critical steps that underpin successful surgical outcomes and minimize intra-operative and post-operative complications for femoral fractures.

Pre-Operative Planning

1. Clinical Assessment and Resuscitation:

   • ATLS Protocol: For high-energy trauma, strictly adhere to ATLS guidelines. Prioritize airway, breathing, and circulation (ABCs). Identify and manage life-threatening injuries before addressing femoral fractures. Polytrauma patients often require resuscitation for hemorrhagic shock, which can be significant with femoral shaft fractures.
   • Neurological Exam: Thoroughly document pre-operative neurological status, specifically evaluating sciatic, femoral, and peroneal nerve function. This baseline is crucial for detecting iatrogenic injury.
   • Vascular Exam: Assess distal pulses and perfusion (dorsalis pedis, posterior tibial). For high-energy femoral shaft fractures, consider ankle-brachial index (ABI) measurement or Doppler ultrasound, especially if there is significant displacement or an open wound in proximity to major vessels.
   • Skin and Soft Tissues: Detailed examination for open wounds, abrasions, contusions, or degloving injuries. Document the Gustilo-Anderson classification for any open fractures, as this dictates antibiotic prophylaxis and debridement urgency.
   • Associated Injuries: A systematic "head-to-toe" evaluation is mandatory. Pay particular attention to the ipsilateral limb to rule out other injuries such as hip dislocation, acetabular fractures, ipsilateral femoral neck fracture, or tibial plateau/shaft fractures ("floating knee"). Missed injuries are a significant source of morbidity.

2. Diagnostic Imaging:

   • Radiographs:
     • Femoral Neck: Standard AP and true lateral views of the hip are essential. A true lateral view of the proximal femur can be challenging but is paramount for assessing displacement and identifying basicervical fractures. Traction views may be helpful.
     • Femoral Shaft: Full-length AP and lateral radiographs of the entire femur, including the hip and knee joints, are non-negotiable. This is to rule out ipsilateral femoral neck, subtrochanteric, or supracondylar/intercondylar knee fractures. Rotation and angulation should be carefully assessed.
   • Computed Tomography (CT) Scan:
     • Femoral Neck: Indispensable for detecting occult femoral neck fractures (when X-rays are negative but clinical suspicion persists, especially in young patients), assessing comminution, and evaluating articular involvement. Multiplanar reconstructions are invaluable.
     • Femoral Shaft: Useful for complex comminuted patterns, assessing cortical defects, or identifying intra-articular extension in proximal or distal shaft fractures. Essential for evaluating associated injuries (e.g., pelvic or acetabular fractures).
   • Magnetic Resonance Imaging (MRI): The gold standard for detecting occult femoral neck fractures when X-rays and CT are equivocal, particularly in young patients with unexplained hip pain after trauma. It can also identify soft tissue injuries and stress fractures.
   • Angiography: Indicated if there is clinical suspicion of vascular injury (e.g., diminished pulses, rapidly expanding hematoma, Type IIIC open fracture).

   
   Figure 1: Critical imaging for femoral fractures. AP and lateral views of the entire femur, extending from the pelvis to the knee, are mandatory to identify subtle ipsilateral injuries. A dedicated hip series, including a true lateral, is crucial for femoral neck assessment.

3. Pre-operative Templating:

   • Femoral Neck (Arthroplasty): Use contralateral hip radiographs or digital templates to determine appropriate femoral component size, neck length, and offset to restore hip biomechanics and leg length.
   • Femoral Shaft (IM Nailing): Measure the contralateral femur for nail length and diameter. Consider the native femoral bow (sagittal plane curvature) and anticipate potential reaming requirements. This also helps plan entry portal and locking screw placement.

4. Timing of Surgery:

   • Femoral Neck: Displaced fractures in young, active patients are orthopedic emergencies. Surgical fixation within 6 hours significantly reduces the risk of AVN. Delay beyond 24 hours is associated with a dramatic increase in complication rates.
   • Femoral Shaft: Early fixation within 24 hours (or 3-5 days in hemodynamically unstable polytrauma patients undergoing damage control orthopedics) reduces the incidence of systemic complications such as fat embolism syndrome, ARDS, pneumonia, and venous thromboembolism.

Patient Positioning

Correct patient positioning is paramount for surgical access, maintenance of reduction, and accurate implant placement, while protecting the patient from iatrogenic injury.

1. Femoral Neck Fractures:

   • Supine on a radiolucent operating table: This is the standard for cannulated screw fixation or dynamic hip screw application. It allows for unrestricted C-arm access for AP and lateral fluoroscopy. The contralateral limb can be placed in a well-padded stirrup or frog-leg position to facilitate abduction and internal rotation as needed for reduction.
   • Lateral decubitus: Utilized for hemiarthroplasty or total hip arthroplasty (THA) via posterolateral or direct lateral approaches. The patient is secured with a beanbag and appropriate supports to maintain stability.
   • Anterior supine position: For THA via the direct anterior approach, often on a specialized table that allows hip hyperextension and external rotation for femoral access.

2. Femoral Shaft Fractures:

   • Supine on a fracture table: The most common and preferred position for antegrade IM nailing. The affected leg is placed in a traction boot, and longitudinal traction is applied to restore length. The contralateral limb is typically abducted and flexed in a well-padded stirrup or leg holder to allow C-arm access from the perineum to the knee. Meticulous padding of the perineum, bony prominences, and neurovascular bundles is crucial to prevent pressure sores or nerve palsies. The amount of traction must be carefully monitored.
   • Supine on a radiolucent operating table: Used for retrograde IM nailing, plating, or when a fracture table is unavailable or contraindicated. Manual traction or a temporary external fixator can aid in reduction and maintenance.
   • Lateral decubitus: Occasionally used for specific plating approaches, but less common for IM nailing. It allows access to the lateral and posterior aspects of the femur.

Key Considerations for Positioning (Both):
* Fracture Reduction: Ensure the chosen position allows for effective reduction maneuvers and maintenance of reduction throughout the procedure.
* C-arm Access: Unobstructed fluoroscopic imaging in multiple planes (AP, lateral, oblique) is critical for confirming reduction, guiding hardware placement, and assessing alignment. The C-arm must be able to rotate freely.
* Neurovascular Protection: Meticulous padding and careful limb manipulation are essential to prevent iatrogenic nerve (e.g., sciatic, peroneal, femoral) or vascular injury, especially around traction points and bony prominences.
* Sterility: Ensure a wide sterile field and meticulous draping that accommodates the surgical approach and C-arm movements.
* Anesthetic Considerations: Collaborate with the anesthesiologist regarding patient stability, potential for blood loss, and nerve blocks.

Detailed Surgical Approach / Technique

The surgical approach and technique are highly dependent on the fracture type, location, displacement, patient age, and associated injuries.

Femoral Neck Fractures

1. Closed Reduction and Internal Fixation (CRPP & Cannulated Screws)

• Indications: Nondisplaced or minimally displaced fractures (Garden I, II) in young, active patients, or for Garden III fractures where anatomical reduction is achieved in young patients.
• Patient Positioning: Supine on a radiolucent table or fracture table with a traction boot.
• Reduction Maneuver (for displaced fractures): Requires judicious fluoroscopic guidance.
  1. Apply longitudinal traction to disimpact the fracture.
  2. Internally rotate the limb to correct external rotation and restore anteversion.
  3. Gently abduct to correct varus displacement.
  4. Confirm reduction with AP and true lateral fluoroscopy. Key indicators for satisfactory reduction include:
     • AP View: Restoration of the normal neck-shaft angle (125-135°), no significant varus or valgus malalignment, and intact medial cortical continuity (Shenton's line).
     • Lateral View: Restoration of normal femoral neck anteversion, absence of posterior sag or angulation, and parallel "Garden alignment" between the medial cortex of the femoral neck and the inferior cortex of the femoral head. Anatomical reduction is paramount in young patients.
• Approach: Two to three small (1-2 cm) incisions on the lateral aspect of the proximal femur, aligned with the planned guide wire entry points.
• Technique (Multiple Cannulated Screws):
  1. Guide Wire Placement: Insert 2-3 parallel guide wires (e.g., 2.0 or 2.5 mm) across the fracture site into the femoral head. An inverted triangle configuration on the AP view and central placement on the lateral view provides optimal biomechanical stability. Wires should achieve subchondral bone purchase in the femoral head. Avoid penetration of the articular cartilage.
  2. Screw Selection: Typically, 6.5mm or 7.3mm cannulated partially threaded screws are used. Screw length is measured using a depth gauge over the guide wire.
  3. Screw Insertion: Predrill through the lateral cortex if bicortical purchase is desired. Insert screws over the guide wires. The lag effect provided by partially threaded screws compresses the fracture fragments. The inferior-posterior screw is biomechanically the most important for resisting shear forces.
  4. Confirm Fixation: AP and lateral fluoroscopy to confirm final screw position, fracture reduction, and stability.
• Pearls:
  • Obtain a true lateral fluoroscopic image. Failure to do so can lead to an anterior or posterior malreduction.
  • In impacted valgus fractures (Garden I), avoid over-reduction or further displacement. Fixation in situ is often sufficient.
  • Maintain reduction throughout the procedure. Any loss of reduction should prompt re-reduction.

2. Hemiarthroplasty or Total Hip Arthroplasty (THA)

• Indications: Displaced fractures (Garden III/IV) in elderly, low-demand patients (hemiarthroplasty) or active elderly patients with pre-existing degenerative hip disease (THA).
• Patient Positioning: Lateral decubitus for posterolateral or direct lateral approaches, or supine for direct anterior approach.
• Approach (Posterolateral, Kocher-Langenbeck):
  1. Incision: A curvilinear or straight incision centered over the greater trochanter, extending proximally and distally.
  2. Internervous Plane: Incise the fascia lata. Develop the interval between the gluteus maximus (supplied by the inferior gluteal nerve) and the gluteus medius/minimus (supplied by the superior gluteal nerve). The short external rotators (piriformis, obturators, gemelli) are identified posterior to the greater trochanter.
  3. Capsulotomy: Externally rotate the leg. Detach the piriformis and short external rotators from their insertion on the greater trochanter (tag with sutures for reattachment). Incise the posterior hip capsule, typically in a T-shape or straight line.
• Technique (General Arthroplasty Principles):
  1. Femoral Head Excision: Dislocate the hip. Osteotomize the femoral neck at the desired level (typically 1 cm above the lesser trochanter, ensuring enough bone for stem support).
  2. Femoral Canal Preparation: Progressively ream the femoral canal to the desired diameter, then broach to achieve appropriate fit and fill for the chosen prosthetic stem (cemented or uncemented).
  3. Trial Reduction: Insert trial stem and head (and acetabular component for THA) to assess leg length equality, hip stability through range of motion, and soft tissue tension. Adjust as needed.
  4. Implant Insertion: Insert the definitive femoral stem (cemented or uncemented) and prosthetic head. For THA, prepare the acetabulum with reaming and insert the acetabular component (cemented or uncemented) followed by the liner.
  5. Capsular Repair/Rotator Reattachment: Repair the posterior capsule and reattach the short external rotators to the greater trochanter to enhance posterior hip stability. Close layers.

Femoral Shaft Fractures

1. Intramedullary (IM) Nailing

• Indications: Gold standard for most adult femoral shaft fractures.
• Patient Positioning: Supine on a fracture table is most common for antegrade nailing. Supine on a regular radiolucent table for retrograde nailing or if a fracture table is contraindicated.
• Reduction Maneuver:
  1. Traction: Apply strong longitudinal traction (via fracture table or manually) to restore length and axial alignment.
  2. Manipulation: Use external maneuvers (e.g., ball spike pushers, manual pressure) or a temporary external fixator as a reduction aid.
  3. Rotational Alignment: Critically assess. Compare patellar alignment, foot rotation, or intra-operative CT guidance if available. Significant rotational malunion is functionally debilitating.
  4. Fluoroscopy: Continuously confirm reduction in both AP and lateral planes.
• Approaches & Entry Portals:
  • Antegrade IM Nailing:
    • Piriformis Fossa Entry: (Traditional) A curvilinear or longitudinal incision proximal to the greater trochanter. Split the gluteus medius fibers. Locate the piriformis fossa (medial to the greater trochanter tip). Use an awl or drill to create the entry portal. Risk of iatrogenic AVN of the femoral head if not placed correctly.
    • Greater Trochanteric Entry (Trochanteric Entry Nail): (Increasingly common) Incision at or slightly anterior to the tip of the greater trochanter. Benefits include easier access, potentially less abductor muscle damage, and better for proximal fractures. Avoids the piriformis fossa.
  • Retrograde IM Nailing:
    • Indications: Ipsilateral femoral neck fracture, ipsilateral tibial fracture ("floating knee"), morbid obesity, pregnancy, polytrauma patients requiring simultaneous treatment of other injuries in a supine position, or very distal shaft fractures.
    • Approach: Medial or lateral parapatellar incision, entering the knee joint. The entry portal is created in the intercondylar notch, typically slightly anterior to Blumensaat's line and medial to the PCL origin. Avoid damaging the PCL and chondral surfaces.
• Technique (Antegrade, Reamed Nailing):
  1. Entry Portal Creation: Use an awl or drill to create the chosen entry portal.
  2. Guide Wire Insertion: Insert a flexible guide wire (e.g., 2.5 mm ball-tipped) across the fracture site into the distal fragment. Ensure central placement in both AP and lateral views.
  3. Reaming: Progressively ream the femoral canal incrementally (e.g., 0.5 or 1.0 mm per reamer) typically 1-2 mm larger than the chosen nail diameter. Reaming promotes biological healing by stimulating endosteal blood supply and providing cancellous bone graft. Use caution in patients with head injury or pulmonary compromise (fat embolism risk).
  4. Nail Insertion: Insert the IM nail over the guide wire. Drive the nail using gentle blows, maintaining continuous reduction of the fracture. The nail should pass just distal to the fracture site initially, then be driven across.
  5. Proximal Locking: Lock proximally (typically 2 screws) using a targeting guide. This controls rotation and prevents shortening.
  6. Distal Locking: Lock distally (1 or 2 screws) using a targeting device or freehand technique with fluoroscopy. This secures the fracture in length and rotation. Ensure bicortical purchase for all locking screws.
  7. Confirm Fixation: Full-length AP and lateral fluoroscopy to confirm length, alignment (varus/valgus, antecurvatum/recurvatum), and rotation.
• Pearls:
  • For ipsilateral femoral neck and shaft fractures, the femoral neck fracture is typically fixed first (e.g., cannulated screws) via an anterior or separate incision, followed by antegrade IM nailing of the shaft using a reconstructive nail (allowing for proximal locking into the femoral head). Alternatively, a retrograde IM nail can be used for the shaft after neck fixation.
  • Unreamed Nailing: May be chosen for hemodynamically unstable polytrauma patients (damage control orthopedics) or severe open fractures to minimize the systemic inflammatory response, although reaming may improve union rates.
  • Careful guide wire and reamer manipulation is vital to prevent canal perforation.

2. Plate Fixation

• Indications: Used for select cases where IM nailing is unsuitable or contraindicated:
  • Very proximal or distal metadiaphyseal fractures where nail purchase is inadequate.
  • Pediatric fractures (to avoid physeal damage).
  • Ipsilateral femoral neck and shaft fractures where the neck component requires plating or is amenable to separate fixation from a shaft plate.
  • Articular extension into the hip or knee.
  • Severely comminuted fractures with large segmental defects that may benefit from a biological plating technique (MIPO).
  • Certain open fractures with extensive soft tissue damage or contamination.
• Approaches:
  • Lateral Approach (Direct Lateral or Minimally Invasive Plate Osteosynthesis - MIPO): Incision on the lateral thigh. Split the vastus lateralis muscle to expose the femur. For MIPO, small incisions are made proximally and distally, and the plate is slid submuscularly or subfascially.
  • Anterolateral Approach: Incision centered on the anterior border of the greater trochanter, extending distally. The internervous plane between the rectus femoris and vastus lateralis is identified and protected.
• Technique:
  1. Exposure & Reduction: Expose the fracture site as minimally as possible while achieving indirect or direct anatomical reduction of length, alignment, and rotation. Use reduction clamps, temporary external fixators, or lag screws.
  2. Plate Application: Select an appropriately sized locked compression plate (LCP) or dynamic compression plate (DCP). Apply the plate as a bridging osteosynthesis (for comminuted fractures, maintaining indirect reduction and avoiding stripping of fragments) or a compression plate (for simple patterns).
  3. Screw Insertion: Insert screws through the plate, ensuring adequate cortical purchase. For LCPs, fixed-angle locking screws provide angular stability, particularly advantageous in osteoporotic bone or comminuted fractures.
  4. Confirm Fixation: AP and lateral fluoroscopy or radiographs to confirm reduction and stable fixation.
• Pearls:
  • MIPO techniques can preserve soft tissue vascularity and promote biological healing, especially for comminuted fractures.
  • Protect the vastus lateralis innervation.
  • Avoid excessive soft tissue stripping ("biological fixation") to preserve periosteal blood supply.
  • Consider plate position to avoid stress risers or compromise of future arthroplasty if indicated.

Complications & Management

Complications following femoral neck and shaft fractures can be broadly categorized into systemic and local. Early recognition and aggressive management are paramount for optimizing patient outcomes.

Systemic Complications (More prevalent in high-energy trauma/polytrauma)

• Hemorrhage and Shock: Femoral shaft fractures can lead to significant blood loss (1-2 liters). Aggressive resuscitation, blood product transfusion, and early fracture stabilization are critical.
• Fat Embolism Syndrome (FES): Occurs when fat globules enter the bloodstream, causing pulmonary and cerebral symptoms. Incidence is 0.5-2% but often higher in polytrauma. Management is supportive (oxygen, ventilation), with early fixation reducing risk.
• Acute Respiratory Distress Syndrome (ARDS): A severe form of lung injury, often associated with FES or severe trauma. Supportive care in ICU.
• Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE): High risk due to immobility and trauma. Prophylaxis with mechanical (compression devices) and pharmacological agents (anticoagulants) is crucial.
• Infection (Surgical Site): Particularly for open fractures. Prophylactic antibiotics, meticulous debridement, and sterile technique are essential.
• Pneumonia, Urinary Tract Infections: Common in bedridden patients. Early mobilization and diligent nursing care prevent these.

Local Complications

Femoral Neck Fractures

| Complication | Incidence (%) | Salvage Strategy |
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Introduction & Epidemiology

Fractures of the femur, encompassing both the femoral neck and shaft, represent a critical domain in orthopedic trauma due to their association with high morbidity, prolonged functional recovery, and potential life-threatening complications. These distinct yet sometimes concomitant injuries demand swift and precise diagnosis, judicious surgical planning, and meticulous operative execution. This comprehensive review highlights essential considerations for orthopedic surgeons, residents, and medical students in managing these significant fractures.

Femoral fractures typically present with a bimodal epidemiological distribution. In younger, physiologically active individuals, these injuries are predominantly the result of high-energy trauma, such as motor vehicle collisions, industrial accidents, or significant falls from height. These patients often present with multiple associated injuries (polytrauma), necessitating an Advanced Trauma Life Support (ATLS) approach and a high index of suspicion for concurrent pathology. Conversely, in the elderly population, femoral fractures are overwhelmingly associated with low-energy mechanisms, primarily ground-level falls in the context of underlying osteoporosis. This demographic experiences elevated risks for medical comorbidities, complications related to prolonged immobility, and mortality.

Femoral Neck Fractures:
These injuries are intracapsular and occur in the subcapital, transcervical, or basicervical regions. Their unique anatomy and tenuous vascular supply to the femoral head make them particularly challenging. The incidence of femoral neck fractures is significantly higher in the elderly due to osteoporosis, with women being affected more often than men. Approximately half of all hip fractures involve the femoral neck. In younger patients, while less common, femoral neck fractures result from substantial trauma and carry a higher risk of complications if not anatomically reduced and stably fixed due to the implications for future hip function. Early diagnosis of subtle or occult femoral neck fractures is paramount to prevent delayed displacement, nonunion, and avascular necrosis.

Femoral Shaft Fractures:
The femoral shaft, being the largest and strongest bone in the body, typically fractures under extreme force. As such, these are predominantly high-energy injuries, with motor vehicle accidents accounting for a substantial proportion. The incidence is highest in young males. Femoral shaft fractures are often associated with significant blood loss (estimates range from 1 to 2 liters internally) and a high rate of concomitant injuries (20-60%), including head injuries, abdominal and thoracic trauma, and ipsilateral lower extremity injuries (e.g., knee ligamentous injury or a "floating knee" with an ipsilateral tibial fracture). Open femoral shaft fractures are also common due to the high-energy mechanism, complicating management and increasing infection risk. Early stabilization significantly reduces systemic complications.

Ipsilateral Femoral Neck and Shaft Fractures:
This specific combination, occurring in approximately 2-6% of femoral shaft fractures, presents a diagnostic and therapeutic challenge. The femoral neck component is often subtle or initially overshadowed by the more obvious shaft injury, leading to a missed diagnosis in up to 30-50% of cases upon initial presentation. A missed or delayed diagnosis of a displaced femoral neck fracture in this context significantly increases the risk of avascular necrosis (AVN) and nonunion, with devastating consequences for the patient. Therefore, comprehensive imaging and a heightened awareness are paramount to adhere to the "Don't Miss It" principle for this specific injury pattern.

Surgical Anatomy & Biomechanics

A profound understanding of the surgical anatomy and biomechanics of the femur is the cornerstone of effective management for both neck and shaft fractures. This knowledge guides surgical approaches, implant selection, and prognostication.

Femoral Neck Anatomy and Biomechanics

The femoral neck is a critical region connecting the femoral head to the shaft, characterized by its unique angulation and vulnerability to vascular compromise.

• Vascular Supply: The arterial supply to the femoral head is predominantly extraskeletal. The medial and lateral femoral circumflex arteries (branches of the profunda femoris artery) form an anastomotic ring at the base of the femoral neck, beneath the joint capsule. From this ring, retinacular arteries (specifically the superior, inferior, anterior, and posterior retinacular arteries of Weitbrecht ) ascend along the femoral neck, piercing the synovial membrane and capsule to supply the femoral head. The most crucial of these are the superior and inferior retinacular arteries. The artery of the ligamentum teres (a branch of the obturator artery) provides a variable, often minor, contribution to the superior portion of the femoral head, particularly significant in children. Displacement of a femoral neck fracture, especially in the subcapital and transcervical regions, frequently disrupts these retinacular vessels, leading to ischemia and subsequent avascular necrosis (AVN) of the femoral head. The timing of reduction and fixation is critical, as delays beyond 6-12 hours in displaced fractures can significantly increase the risk of AVN.
• Bone Structure: The femoral neck consists of cancellous bone with a complex trabecular architecture designed to transmit loads. Key trabecular systems include the primary compressive group (extending from the medial cortex of the femoral shaft to the superomedial aspect of the femoral head and calcar femorale), the primary tensile group (extending from the lateral cortex of the shaft to the superolateral aspect of the femoral head), and secondary groups. The Ward's triangle , an area of relatively sparse trabeculae in the central femoral neck, is particularly susceptible to fracture in osteoporotic bone.
• Biomechanics: The femoral neck is subjected to significant compressive, tensile, and shear forces during weight-bearing. Its characteristic anteversion (average 10-20 degrees) and inclination (neck-shaft angle, average 125-135 degrees) influence load transmission.
  • Garden Classification: This widely used classification system for femoral neck fractures in adults describes the degree of displacement and impaction, directly correlating with the likelihood of vascular disruption and AVN:
    • Garden I: Incomplete fracture, valgus impacted.
    • Garden II: Complete, nondisplaced fracture.
    • Garden III: Complete fracture, partially displaced (typically varus, with intact posterior retinaculum).
    • Garden IV: Complete fracture, fully displaced (no cortical contact).
  • Pauwels Classification: This system classifies femoral neck fractures based on the angle of the fracture line relative to the horizontal, reflecting the magnitude of shear forces:
    • Pauwels I: <30 degrees (low shear).
    • Pauwels II: 30-50 degrees (moderate shear).
    • Pauwels III: >50 degrees (high shear).
      Higher Pauwels angles are associated with increased instability and a greater risk of nonunion with internal fixation, often requiring more stable constructs or arthroplasty. The biomechanical stress across the fracture increases significantly with higher Pauwels angles, demanding more rigid fixation or prosthetic replacement.

Femoral Shaft Anatomy and Biomechanics

The femoral shaft is a robust diaphysis designed to withstand substantial axial, bending, and torsional loads, often failing only under high-energy trauma.

• Muscle Attachments and Deforming Forces: The powerful muscles surrounding the femur create characteristic deforming forces on fracture fragments, making closed reduction challenging.
  • Proximal Fragment: Typically flexed by the iliopsoas, abducted by the gluteus medius and minimus, and externally rotated by the short external rotators (piriformis, obturators, gemelli, quadratus femoris).
  • Distal Fragment: Adducted by the adductor musculature and flexed by the gastrocnemius (especially in supracondylar fractures).
  • Overall: These forces can lead to significant shortening, angular deformity (varus/valgus), and rotational malalignment if not appropriately controlled. Surgical intervention aims to counteract these forces and restore anatomical alignment.
• Neurovascular Structures: The major neurovascular bundle (femoral artery, femoral vein, femoral nerve) lies anteromedially, superficial to the adductor musculature in the adductor canal. Posteriorly, the sciatic nerve traverses the posterior thigh. Surgical approaches and fracture manipulation must meticulously protect these critical structures. Iatrogenic nerve injury, though rare, can have devastating functional consequences.
• Bone Structure and Biomechanics: The femoral shaft is composed primarily of dense cortical bone, providing immense strength. The canal is relatively wide proximally and distally, narrowing in the isthmus. Fracture patterns often indicate the mechanism of injury:
  • Transverse fractures: Direct bending forces.
  • Oblique fractures: Combination of axial and bending forces.
  • Spiral fractures: Torsional forces.
  • Comminuted fractures: High-energy impact, often with significant soft tissue injury.
  • Segmental fractures: Rare, high-energy injury with two distinct fracture lines isolating a segment of bone.
• Gustilo-Anderson Classification: For open femoral shaft fractures, this classification system (Type I, II, IIIA, IIIB, IIIC) dictates the urgency and extent of surgical debridement, antibiotic prophylaxis, and soft tissue management, with Type IIIC indicating arterial injury requiring vascular repair.

Indications & Contraindications

The management of femoral neck and shaft fractures is predominantly operative, with non-operative treatment reserved for highly selected cases. The choice of surgical technique depends on patient factors, fracture morphology, bone quality, and associated injuries.

Femoral Neck Fractures

Indications for Operative Management:

1. Nearly all femoral neck fractures in physiologically active patients: Due to the high risk of nonunion and avascular necrosis (AVN) with non-operative treatment, even nondisplaced or minimally displaced fractures are typically stabilized.
2. Displaced fractures (Garden III/IV) in young patients (<60-65 years): Urgent anatomical reduction and stable internal fixation (e.g., multiple cannulated screws, dynamic hip screw with derotation screw). The primary goal is to preserve the native femoral head. Surgery should ideally be performed within 6 hours of injury to minimize AVN risk. Delays beyond this window significantly increase the risk of poor outcomes.
3. Nondisplaced or minimally displaced fractures (Garden I/II) in young, active patients: Internal fixation (typically multiple cannulated screws) is indicated to prevent secondary displacement and allow early mobilization. These are not "stable" enough for prolonged bed rest.
4. Displaced fractures (Garden III/IV) in elderly, low-demand patients (often >75 years or with significant comorbidities): Hemiarthroplasty (bipolar or unipolar) is generally preferred due to predictable outcomes, earlier mobilization, and lower re-operation rates compared to internal fixation, particularly in the context of compromised bone quality.
5. Displaced fractures (Garden III/IV) in active elderly patients (physiologically <75 years) or those with pre-existing symptomatic hip pathology (e.g., osteoarthritis, inflammatory arthritis): Total Hip Arthroplasty (THA) offers superior long-term functional outcomes and lower re-operation rates compared to hemiarthroplasty for this specific subgroup.
6. Pathological fractures: Requires stabilization, often with adjunctive cement augmentation, and biopsy for definitive diagnosis and oncologic staging.

Relative Contraindications for Operative Management (Internal Fixation of Femoral Neck):

• Severe comminution of the femoral neck, precluding stable internal fixation. This often leads to mechanical failure.
• Extreme osteoporosis where hardware purchase is insufficient (favoring arthroplasty due to better fixation in poor bone).
• Severe medical comorbidities that genuinely preclude any surgical intervention (rare, as even debilitated patients benefit from pain relief and nursing care with arthroplasty). The risk-benefit ratio must be carefully weighed.
• Pre-existing severe degenerative hip disease: (absolute indication for THA, as preserving a diseased femoral head is futile).
• Significant delay to surgery (>24-48 hours) for displaced fractures in young patients: While still fixable, the AVN risk is significantly elevated, and surgeon judgment regarding outcomes and patient counseling is critical.

Femoral Shaft Fractures

Indications for Operative Management:

1. Nearly all adult femoral shaft fractures: Intramedullary (IM) nailing is the gold standard, offering superior biomechanics, high union rates, and allowing early weight-bearing and mobilization.
2. Open fractures: Requires urgent surgical debridement, stabilization (often IM nail), and aggressive broad-spectrum antibiotic therapy. The Gustilo-Anderson classification guides the management protocol.
3. Pathological fractures: IM nailing, frequently with cement augmentation, is necessary to prevent further collapse and provide stability, often as part of a comprehensive oncological treatment plan.
4. Polytrauma patients: Early fixation (within 24 hours, often with damage control orthopedics principles for unstable patients) reduces the incidence of systemic complications such as fat embolism syndrome and acute respiratory distress syndrome (ARDS), and facilitates nursing care.
5. Associated injuries: Ipsilateral femoral neck fracture, ipsilateral tibial fracture ("floating knee"), or significant articular extension into the knee or hip joint may influence the choice of fixation (e.g., retrograde IM nail for floating knee, plates for articular extension, reconstructive nail for ipsilateral neck/shaft).
6. Failed non-operative management: While rare, if a highly selected non-operative case (e.g., specific pediatric fractures) fails to achieve or maintain acceptable alignment, surgical intervention becomes indicated.

Relative Contraindications for Operative Management (IM Nailing of Femoral Shaft):

• Hemodynamic instability or severe medical comorbidities: In severe polytrauma, external fixation may be chosen as a temporizing measure (damage control orthopedics) until the patient is physiologically stable for definitive nailing. This strategy minimizes the "second hit" phenomenon.
• Active infection at the intended entry site for IM nailing. This can necessitate initial debridement and external fixation.
• Severe open fractures (Gustilo-Anderson Type IIIC): Initial external fixation to allow for comprehensive soft tissue debridement, vascular repair, and stabilization of soft tissues before definitive IM nailing, once the soft tissue envelope is optimized.
• Intramedullary canal too narrow for available nails (rare, may require plating or reaming to accommodate).
• Extreme proximal or distal metaphyseal extension where intramedullary nails may not provide optimal fixation or rotational control, potentially favoring plate fixation, especially for intra-articular components.

Summary Table: Operative vs. Non-Operative Indications

Pre-Operative Planning & Patient Positioning

Meticulous pre-operative planning and appropriate patient positioning are critical steps that underpin successful surgical outcomes and minimize intra-operative and post-operative complications for femoral fractures.

Pre-Operative Planning

1. Clinical Assessment and Resuscitation:

   • ATLS Protocol: For high-energy trauma, strictly adhere to ATLS guidelines. Prioritize airway, breathing, and circulation (ABCs). Identify and manage life-threatening injuries before addressing femoral fractures. Polytrauma patients often require aggressive resuscitation for hemorrhagic shock, which can be significant with femoral shaft fractures (up to 2-3 liters of blood loss). Early fracture stabilization can help control blood loss.
   • Neurological Exam: Thoroughly document pre-operative neurological status, specifically evaluating sciatic, femoral, and peroneal nerve function. This baseline is crucial for detecting iatrogenic injury.
   • Vascular Exam: Assess distal pulses and perfusion (dorsalis pedis, posterior tibial). For high-energy femoral shaft fractures, consider ankle-brachial index (ABI) measurement or Doppler ultrasound, especially if there is significant displacement, open wounds in proximity to major vessels, or clinical signs of vascular compromise. Angiography may be necessary for suspected Type IIIC open fractures or segmental arterial injuries.
   • Skin and Soft Tissues: Detailed examination for open wounds, abrasions, contusions, or degloving injuries. Document the Gustilo-Anderson classification for any open fractures, as this dictates antibiotic prophylaxis and debridement urgency. For closed fractures, assess for compartment syndrome, though rare in the thigh.
   • Associated Injuries: A systematic "head-to-toe" evaluation is mandatory. Pay particular attention to the ipsilateral limb to rule out other injuries such as hip dislocation, acetabular fractures, ipsilateral femoral neck fracture, or tibial plateau/shaft fractures ("floating knee"). Missed injuries are a significant source of morbidity and require modification of the treatment plan.

2. Diagnostic Imaging:

   • Radiographs:
     • Femoral Neck: Standard AP and true lateral views of the hip are essential. A true lateral view of the proximal femur can be challenging but is paramount for assessing displacement, identifying basicervical fractures, and evaluating the degree of comminution. Traction views may be helpful in disimpacting and visualizing the fracture.
     • Femoral Shaft: Full-length AP and lateral radiographs of the entire femur, including the hip and knee joints, are non-negotiable. This is to rule out ipsilateral femoral neck, subtrochanteric, or supracondylar/intercondylar knee fractures. Rotation and angulation should be carefully assessed. AP and lateral views centered on the fracture are also needed.
   • Computed Tomography (CT) Scan:
     • Femoral Neck: Indispensable for detecting occult femoral neck fractures (when X-rays are negative but clinical suspicion persists, especially in young patients and polytrauma), assessing comminution, and evaluating articular involvement. Multiplanar reconstructions are invaluable. It helps delineate the precise fracture pattern (e.g., Garden classification, Pauwels angle) and bone stock.
     • Femoral Shaft: Useful for complex comminuted patterns, assessing cortical defects, or identifying intra-articular extension in proximal or distal shaft fractures. Essential for evaluating associated injuries (e.g., pelvic or acetabular fractures). It can also help assess rotational alignment in complex fractures.
   • Magnetic Resonance Imaging (MRI): The gold standard for detecting occult femoral neck fractures when X-rays and CT are equivocal, particularly in young patients with unexplained hip pain after trauma. It can also identify stress fractures, bone bruises, and soft tissue injuries.
   • Angiography: Indicated if there is clinical suspicion of vascular injury (e.g., diminished pulses, rapidly expanding hematoma, Type IIIC open fracture, or proximity of hardware to major vessels).

   
   Figure 1: Critical imaging for femoral fractures. AP and lateral views of the entire femur, extending from the pelvis to the knee, are mandatory to identify subtle ipsilateral injuries. A dedicated hip series, including a true lateral, is crucial for femoral neck assessment. Note the need for high-quality images free of rotation and distraction to accurately classify and plan fixation.

3. Pre-operative Templating:

   • Femoral Neck (Arthroplasty): Use contralateral hip radiographs or digital templates to determine appropriate femoral component size, neck length, and offset to restore hip biomechanics and leg length equality. This minimizes the risk of leg length discrepancy and instability.
   • Femoral Shaft (IM Nailing): Measure the contralateral femur for nail length and diameter. Consider the native femoral bow (sagittal plane curvature) and anticipate potential reaming requirements. This also helps plan entry portal and locking screw placement. Proper nail diameter is crucial to achieve adequate cortical contact for stability.

4. Timing of Surgery:

   • Femoral Neck: Displaced fractures in young, active patients are orthopedic emergencies. Surgical fixation within 6 hours significantly reduces the risk of AVN. Delay beyond 24 hours is associated with a dramatic increase in complication rates. For elderly patients, surgery within 24-48 hours is generally recommended to reduce medical complications.
   • Femoral Shaft: Early fixation within 24 hours (or 3-5 days in hemodynamically unstable polytrauma patients undergoing damage control orthopedics, i.e., "early appropriate care") reduces the incidence of systemic complications such as fat embolism syndrome, ARDS, pneumonia, and venous thromboembolism.

Patient Positioning

Correct patient positioning is paramount for surgical access, maintenance of reduction, and accurate implant placement, while protecting the patient from iatrogenic injury.

1. Femoral Neck Fractures:

   • Supine on a radiolucent operating table: This is the standard for cannulated screw fixation or dynamic hip screw application. It allows for unrestricted C-arm access for AP and lateral fluoroscopy. The contralateral limb can be placed in a well-padded stirrup or frog-leg position to facilitate abduction and internal rotation as needed for reduction. Traction may be used cautiously.
   • Lateral decubitus: Utilized for hemiarthroplasty or total hip arthroplasty (THA) via posterolateral or direct lateral approaches. The patient is secured with a beanbag and appropriate supports to maintain stability.
   • Anterior supine position: For THA via the direct anterior approach, often on a specialized table that allows hip hyperextension and external rotation for femoral access.

2. Femoral Shaft Fractures:

   • Supine on a fracture table: The most common and preferred position for antegrade IM nailing. The affected leg is placed in a traction boot, and longitudinal traction is applied to restore length. The contralateral limb is typically abducted and flexed in a well-padded stirrup or leg holder to allow C-arm access from the perineum to the knee. Meticulous padding of the perineum, bony prominences (e.g., sacrum, heels, fibular head), and neurovascular bundles is crucial to prevent pressure sores or nerve palsies. The amount of traction must be carefully monitored to avoid neurological injury.
   • Supine on a radiolucent operating table: Used for retrograde IM nailing, plating, or when a fracture table is unavailable or contraindicated. Requires manual traction or a temporary external fixator as an aid for reduction and maintenance of length.
   • Lateral decubitus: Occasionally used for specific plating approaches (e.g., subtrochanteric fractures, femoral shortening osteotomy), but less common for IM nailing of diaphyseal fractures.

Key Considerations for Positioning (Both):
* Fracture Reduction: Ensure the chosen position allows for effective reduction maneuvers and maintenance of reduction throughout the procedure. For complex or comminuted fractures, additional percutaneous clamps or K-wires may be required.
* C-arm Access: Unobstructed fluoroscopic imaging in multiple planes (AP, lateral, oblique) is critical for confirming reduction, guiding hardware placement, and assessing alignment. The C-arm must be able to rotate freely without contaminating the sterile field or being obstructed by the table/patient.
* Neurovascular Protection: Meticulous padding and careful limb manipulation are essential to prevent iatrogenic nerve (e.g., sciatic, peroneal, femoral) or vascular injury, especially around traction points and bony prominences. Prophylactic measures include regular pressure relief and appropriate positioning aids.
* Sterility: Ensure a wide sterile field and meticulous draping that accommodates the surgical approach, C-arm movements, and potential conversion to open techniques if closed reduction fails.
* Anesthetic Considerations: Collaborate closely with the anesthesiologist regarding patient stability, potential for blood loss, and the use of regional nerve blocks (e.g., fascia iliaca block) for pre-operative pain control and post-operative analgesia.

Detailed Surgical Approach / Technique

Surgical techniques for femoral neck and shaft fractures vary significantly based on fracture morphology, patient age, bone quality, implant availability, and surgeon preference. The following outlines general principles and common approaches.

Femoral Neck Fractures

1. Closed Reduction and Internal Fixation (CRPP & Cannulated Screws)

• Indications: Nondisplaced or minimally displaced fractures (Garden I, II) in young, active patients, or for Garden III fractures where anatomical reduction can be achieved in young patients. This method aims to preserve the native femoral head.
• Patient Positioning: Supine on a radiolucent table or fracture table with a traction boot. The C-arm is positioned for AP and true lateral fluoroscopic views.
• Reduction Maneuver (for displaced fractures): Requires judicious fluoroscopic guidance.
  1. Apply longitudinal traction to disimpact the fracture fragments and restore length.
  2. Internally rotate the limb (typically 15-20 degrees from neutral) to correct external rotation deformity and restore femoral neck anteversion.
  3. Gently abduct (if varus displacement) to correct any varus angulation.
  4. Confirm reduction with AP and true lateral fluoroscopy. Key indicators for satisfactory reduction:
     • AP View: Restoration of the normal neck-shaft angle (125-135°), no significant varus or valgus malalignment, and intact medial cortical continuity (Shenton's line).
     • Lateral View: Restoration of normal femoral neck anteversion, absence of posterior sag or angulation, and parallel "Garden alignment" between the medial cortex of the femoral neck and the inferior cortex of the femoral head. An anatomical or slight valgus reduction (Garden I type reduction) is paramount in young patients to optimize vascularity and healing potential.
• Surgical Approach: Typically percutaneous. Two to three small (1-2 cm) incisions are made on the lateral aspect of the proximal femur, aligned with the planned guide wire entry points, typically distal to the vastus ridge.
• Technique (Multiple Cannulated Screws):
  1. Guide Wire Placement: Insert 2-3 parallel guide wires (e.g., 2.0 or 2.5 mm) across the fracture site into the femoral head. An inverted triangle configuration on the AP view (superior, anterior, posterior) and central placement on the lateral view provides optimal biomechanical stability. Wires should achieve subchondral bone purchase in the femoral head, approximately 5-10 mm from the articular surface. Avoid penetration of the articular cartilage.
  2. Screw Selection: Typically, 6.5mm or 7.3mm cannulated partially threaded screws are used. Screw length is measured using a depth gauge over the guide wire.
  3. Screw Insertion: A pilot hole may be drilled through the lateral cortex to prevent splitting. Insert screws over the guide wires, ensuring appropriate depth and compression across the fracture site. The partially threaded design allows for a lag effect, compressing the fracture fragments. The inferior-posterior screw is biomechanically the most important for resisting shear forces. The screws should be divergent to increase stability.
  4. Confirm Fixation: AP and lateral fluoroscopy to confirm final screw position, fracture reduction, and stability.
• Pearls:
  • Obtain a true lateral fluoroscopic image. Failure to do so can lead to an anterior or posterior malreduction, increasing nonunion risk.
  • In impacted valgus fractures (Garden I), avoid over-reduction or further displacement. Fixation in situ is often sufficient and often preferred.
  • Maintain reduction throughout the entire procedure. Any loss of reduction should prompt re-reduction attempts.
  • Consider a dynamic hip screw (DHS) for basicervical or more comminuted transcervical fractures, as it offers greater rotational stability.

2. Hemiarthroplasty or Total Hip Arthroplasty (THA)

• Indications: Displaced fractures (Garden III, IV) in elderly, low-demand patients (hemiarthroplasty) or active elderly patients with pre-existing degenerative hip disease (THA).
• Patient Positioning: Lateral decubitus for posterolateral or direct lateral approaches, or supine for direct anterior approach on a specialized table.
• Surgical Approach (Posterolateral, Kocher-Langenbeck):
  1. Incision: A curvilinear or straight incision centered over the greater trochanter, extending proximally and distally.
  2. Internervous Plane: Incise the fascia lata. Develop the interval between the gluteus maximus (supplied by the inferior gluteal nerve) and the gluteus medius/minimus (supplied by the superior gluteal nerve). The short external rotators (piriformis, obturators, gemelli, quadratus femoris) are identified posterior to the greater trochanter.
  3. Capsulotomy: Externally rotate the leg. Detach the piriformis and short external rotators from their insertion on the greater trochanter (tag with sutures for reattachment). Incise the posterior hip capsule, typically in a T-shape or straight line.
• Technique (General Arthroplasty Principles):
  1. Femoral Head Excision: Dislocate the hip. Osteotomize the femoral neck at the desired level (typically 1 cm above the lesser trochanter, ensuring enough bone for stem support).
  2. Femoral Canal Preparation: Progressively ream the femoral canal to the desired diameter, then broach to achieve appropriate fit and fill for the chosen prosthetic stem (cemented or uncemented).
  3. Trial Reduction: Insert trial stem and head (and acetabular component for THA) to assess leg length equality, hip stability through range of motion, and soft tissue tension. Adjust as needed to prevent dislocation.
  4. Implant Insertion: Insert the definitive femoral stem (cemented or uncemented) and prosthetic head. For THA, prepare the acetabulum with reaming and insert the acetabular component (cemented or uncemented) followed by the liner.
  5. Capsular Repair/Rotator Reattachment: Repair the posterior capsule and reattach the short external rotators to the greater trochanter to enhance posterior hip stability and reduce dislocation risk. Close layers anatomically.

Femoral Shaft Fractures

1. Intramedullary (IM) Nailing

• Indications: Gold standard for most adult femoral shaft fractures (transverse, oblique, spiral, comminuted).
• Patient Positioning: Supine on a fracture table is most common for antegrade nailing. Supine on a regular radiolucent table for retrograde nailing or if a fracture table is contraindicated.
• Reduction Maneuver:
  1. Traction: Apply strong longitudinal traction (via fracture table or manually) to disimpact fragments and restore length.
  2. Manipulation: Use external maneuvers (e.g., ball spike pushers, manual pressure) or a temporary external fixator as a reduction aid. Percutaneous clamps or K-wires may be inserted for direct control.
  3. Rotational Alignment: Critically assess. Compare patellar alignment, foot rotation, or intra-operative CT guidance if available. Significant rotational malunion is functionally debilitating. The lesser trochanter's visibility on fluoroscopy can be used as a reference for rotational alignment.
  4. Fluoroscopy: Continuously confirm reduction in both AP and lateral planes.
• Approaches & Entry Portals:
  • Antegrade IM Nailing:
    • Piriformis Fossa Entry: (Traditional) A curvilinear or longitudinal incision proximal to the greater trochanter. Split the gluteus medius fibers. Locate the piriformis fossa (medial to the greater trochanter tip). Use an awl or drill to create the entry portal. Risk of iatrogenic AVN of the femoral head if not placed correctly (too medial) and gluteal lurch if entry is too lateral.
    • Greater Trochanteric Entry (Trochanteric Entry Nail): (Increasingly common) Incision at or slightly anterior to the tip of the greater trochanter. Advantages include easier access in obese patients, potentially less abductor muscle damage, and better for proximal fractures.
  • Retrograde IM Nailing:
    • Indications: Ipsilateral femoral neck fracture, ipsilateral tibial fracture ("floating knee"), morbid obesity, pregnancy, polytrauma patients requiring simultaneous treatment of other injuries in a supine position, or very distal shaft fractures.
    • Approach: Medial or lateral parapatellar incision, entering the knee joint. The entry portal is created in the intercondylar notch, typically slightly anterior to Blumensaat's line and medial to the PCL origin. Avoid damaging the PCL and chondral surfaces.
• Technique (Antegrade, Reamed Nailing):
  1. Entry Portal Creation: Use an awl or drill to create the chosen entry portal. Ensure a direct line to the medullary canal.
  2. Guide Wire Insertion: Insert a flexible guide wire (e.g., 2.5 mm ball-tipped) across the fracture site into the distal fragment. Ensure central placement in both AP and lateral views. The guide wire should pass freely.
  3. Reaming: Progressively ream the femoral canal incrementally (e.g., 0.5 or 1.0 mm per reamer) typically 1-2 mm larger than the chosen nail diameter. Reaming clears the canal, allows a larger, stiffer nail, and promotes biological healing by stimulating endosteal blood supply and providing cancellous bone graft. Use caution in patients with head injury or pulmonary compromise (fat embolism risk); consider unreamed nailing.
  4. Nail Insertion: Insert the IM nail over the guide wire. Drive the nail using gentle blows, maintaining continuous reduction of the fracture. The nail should pass just distal to the fracture site initially, then be driven across the fracture.
  5. Proximal Locking: Lock proximally (typically 2 screws) using a targeting guide. This controls rotation and prevents shortening. Ensure full cortical purchase.
  6. Distal Locking: Lock distally (1 or 2 screws) using a targeting device or freehand technique with fluoroscopy. This secures the fracture in length and rotation. Ensure bicortical purchase for all locking screws.
  7. Confirm Fixation: Full-length AP and lateral fluoroscopy to confirm length, alignment (varus/valgus, antecurvatum/recurvatum), and rotational alignment (e.g., by comparing lesser trochanter size/position). Dynamization (removing a locking screw) may be considered later for delayed union.
• Pearls:
  • For ipsilateral femoral neck and shaft fractures, the femoral neck fracture is typically fixed first (e.g., cannulated screws) via an anterior or separate incision, followed by antegrade IM nailing of the shaft using a reconstructive nail (allowing for proximal locking into the femoral head). Alternatively, a retrograde IM nail can be used for the shaft after neck fixation. The "fix the neck first, then the shaft" principle is usually followed.
  • Unreamed Nailing: May be chosen for hemodynamically unstable polytrauma patients (damage control orthopedics) or severe open fractures to minimize the systemic inflammatory response, although reaming may improve union rates.
  • Careful guide wire and reamer manipulation is vital to prevent canal perforation, especially in areas of cortical thickening or previous implants.

2. Plate Fixation

• Indications: Used for select cases where IM nailing is unsuitable or contraindicated:
  • Very proximal or distal metadiaphyseal fractures where nail purchase is inadequate.
  • Pediatric fractures (to avoid physeal damage).
  • Ipsilateral femoral neck and shaft fractures where the neck component requires plating or is amenable to separate fixation from a shaft plate.
  • Articular extension into the hip or knee requiring anatomical reduction and fixation.
  • Severely comminuted fractures with large segmental defects that may benefit from a biological plating technique (MIPO).
  • Certain open fractures with extensive soft tissue damage or contamination where an IM nail may be contraindicated.
• Approaches:
  • Lateral Approach (Direct Lateral or Minimally Invasive Plate Osteosynthesis - MIPO): Incision on the lateral thigh. Split the vastus lateralis muscle to expose the femur. For MIPO, small incisions are made proximally and distally, and the plate is slid submuscularly or subfascially, often using a percutaneous reduction technique.
  • Anterolateral Approach: Incision centered on the anterior border of the greater trochanter, extending distally. The internervous plane between the rectus femoris and vastus lateralis is identified and protected.
• Technique:
  1. Exposure & Reduction: Expose the fracture site as minimally as possible while achieving indirect or direct anatomical reduction of length, alignment, and rotation. Use reduction clamps, temporary external fixators, or lag screws. For MIPO, fluoroscopy guides reduction without direct visualization of the fracture site.
  2. Plate Application: Select an appropriately sized locked compression plate (LCP) or dynamic compression plate (DCP). Apply the plate as a bridging osteosynthesis (for comminuted fractures, maintaining indirect reduction and avoiding stripping of fragments) or a compression plate (for simple patterns). The plate should be contoured to the anatomical curvature of the femur.
  3. Screw Insertion: Insert screws through the plate, ensuring adequate cortical purchase. For LCPs, fixed-angle locking screws provide angular stability, particularly advantageous in osteoporotic bone or comminuted fractures where traditional screw purchase is limited.
  4. Confirm Fixation: AP and lateral fluoroscopy or radiographs to confirm reduction and stable fixation.
• Pearls:
  • MIPO techniques can preserve soft tissue vascularity and promote biological healing, especially for comminuted fractures, but require significant fluoroscopic skill.
  • Protect the vastus lateralis innervation (motor nerve to vastus lateralis branch of femoral nerve).
  • Avoid excessive soft tissue stripping ("biological fixation") to preserve periosteal blood supply.
  • Consider plate position to avoid stress risers or compromise of future arthroplasty if indicated. Plate length should be adequate (e.g., 8-10 cortices of fixation proximal and distal to the fracture).

Complications & Management

Complications following femoral neck and shaft fractures can be broadly categorized into systemic and local. Early recognition and aggressive management are paramount for optimizing patient outcomes.

Systemic Complications (More prevalent in high-energy trauma/polytrauma)

• Hemorrhage and Shock: Femoral shaft fractures can lead to significant blood loss (1-2 liters internally, or more in open fractures). Aggressive resuscitation, blood product transfusion, and early fracture stabilization are critical. Coagulopathy management is also important.
• Fat Embolism Syndrome (FES): Occurs when fat globules enter the bloodstream, causing pulmonary (hypoxia, dyspnea), cerebral (confusion, coma), and dermatological (petechial rash) symptoms. Incidence is 0.5-2% but often higher in polytrauma. Management is supportive (oxygen, ventilation, hemodynamic support), with early fixation of long bone fractures reducing risk.
• Acute Respiratory Distress Syndrome (ARDS): A severe form of lung injury, often associated with FES, severe trauma, or sepsis. Characterized by severe hypoxemia refractory to oxygen therapy. Supportive care in ICU, including mechanical ventilation.
• Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE): High risk (up to 50% for DVT, 10% for PE) due to immobility, hypercoagulability after trauma, and endothelial injury. Prophylaxis with mechanical (intermittent pneumatic compression devices) and pharmacological agents (low molecular weight heparin or unfractionated heparin) is crucial, tailored to bleeding risk.
• Infection (Surgical Site): Particularly for open fractures. Prophylactic broad-spectrum antibiotics, meticulous debridement (often repeat debridement), and sterile technique are essential. Infection rates for closed fractures are typically low (<2%).
• Pneumonia, Urinary Tract Infections: Common in bedridden patients, especially the elderly. Early mobilization, incentive spirometry, and diligent nursing care prevent these.
• Acute Kidney Injury, Sepsis, Multi-Organ Failure: Potential in severe polytrauma and delayed care.

Local Complications

Femoral Neck Fractures

Femoral Shaft Fractures

Post-Operative Rehabilitation Protocols

Post-operative rehabilitation is crucial for restoring function, preventing complications, and achieving optimal outcomes for both femoral neck and shaft fractures. Protocols are tailored to the type of fracture, surgical fixation, bone quality, and patient's general health.

General Principles of Rehabilitation

1. Early Mobilization: As soon as medically stable, patients should begin mobilization to prevent systemic complications (DVT, PE, pneumonia) and manage pain.
2. Weight-Bearing Status: Dictated by fracture stability, type of fixation, and bone quality.
   • Protected Weight-Bearing (PWB): Partial weight-bearing with crutches or a walker.
   • Weight-Bearing As Tolerated (WBAT): Progressively increasing weight-bearing as pain allows.
   • Non-Weight-Bearing (NWB): No weight on the affected limb.
3. Range of Motion (ROM): Early, gentle ROM exercises to prevent stiffness and improve joint mechanics.
4. Strengthening: Progressive strengthening exercises for the hip, knee, and ankle musculature.
5. Gait Training: Re-education of proper gait mechanics and balance.
6. Pain Management: Multimodal analgesia to facilitate rehabilitation.

Femoral Neck Fractures Rehabilitation

Internal Fixation (Cannulated Screws, DHS):
* Initial Phase (Weeks 0-6):
* Weight-Bearing:
* Nondisplaced/Impacted (Garden I/II): Often PWB or WBAT with crutches/walker immediately post-op, depending on stability and surgeon preference.
* Displaced (Garden III/IV, anatomically reduced): NWB to PWB for 6-12 weeks, progressing based on radiographic evidence of healing and pain.
* ROM: Gentle passive and active-assisted hip ROM exercises. Avoid extremes of motion that might stress the fracture site.
* Muscle Activation: Isometric gluteal and quadriceps strengthening.
* Intermediate Phase (Weeks 6-12):
* Weight-Bearing: Progress from PWB to WBAT as radiographic healing progresses (callus formation, trabecular bridging).
* ROM: Continue full active ROM.
* Strengthening: Progressive resisted exercises for hip abductors, adductors, flexors, and extensors. Gentle knee strengthening.
* Advanced Phase (Weeks 12+):
* Weight-Bearing: Full weight-bearing once union is confirmed radiographically.
* Strengthening & Proprioception: Advanced strengthening, balance, and proprioceptive exercises. Gradual return to activities.
* Hardware Removal: Considered 12-18 months post-op in younger patients with symptomatic hardware or planned future arthroplasty, but not routinely indicated.

Arthroplasty (Hemiarthroplasty, THA):
* Initial Phase (Days 1 - Week 6):
* Weight-Bearing: Typically WBAT immediately post-op, as prosthetic fixation is generally stable.
* ROM: Active and passive hip ROM exercises within hip precaution guidelines to prevent dislocation (specific to approach: posterolateral precautions- avoid hip flexion >90°, internal rotation, adduction; anterior precautions- avoid hip extension, external rotation).
* Muscle Activation: Isometric gluteal and quadriceps contractions. Gentle ankle pumps.
* Ambulation: Early ambulation with crutches or walker, progressing as tolerated.
* Intermediate Phase (Weeks 6-12):
* Weight-Bearing: Progress to full weight-bearing, wean off walking aids.
* ROM: Continue to regain full, pain-free ROM within precautions.
* Strengthening: Progressive strengthening of hip and core musculature. Begin proprioceptive training.
* Advanced Phase (Weeks 12+):
* Strengthening & Function: Advanced strengthening, balance, and functional exercises. Return to low-impact activities. Avoid high-impact sports.
* Hip Precautions: May be relaxed after 3 months, depending on surgeon and patient factors, but some surgeons maintain lifelong precautions.

Femoral Shaft Fractures Rehabilitation

Intramedullary Nailing or Plate Fixation:
* Initial Phase (Weeks 0-6):
* Weight-Bearing:
* Stable Nailing (locked, well-reduced): WBAT immediately post-op is common and encouraged to promote callus formation.
* Unstable Nailing (unlocked, severely comminuted) or Plating (bridging): PWB to NWB initially, progressing to PWB based on stability, pain, and radiographic healing (typically 6-8 weeks).
* ROM: Early, gentle active and passive knee and hip ROM to prevent stiffness. Continuous passive motion (CPM) may be used for knee stiffness.
* Muscle Activation: Isometric quadriceps and hamstring contractions. Gluteal sets, ankle pumps.
* Ambulation: Ambulation with crutches or walker, following prescribed weight-bearing.
* Intermediate Phase (Weeks 6-12):
* Weight-Bearing: Progress from PWB to full weight-bearing as radiographic evidence of union becomes apparent and pain subsides. Wean off walking aids.
* ROM: Continue to achieve full hip and knee ROM. Address any stiffness aggressively with mobilization techniques.
* Strengthening: Progressive resisted exercises for all lower extremity muscle groups, focusing on hip and knee extensors and flexors.
* Advanced Phase (Weeks 12+):
* Strength & Function: Advanced strengthening, proprioceptive, and balance training.
* Functional Return: Gradual return to recreational and sports activities, typically after 6-12 months, once union is solid and strength is restored.
* Hardware Removal: Considered 12-24 months post-union in young, active patients with symptomatic hardware (e.g., pain at entry site, prominent screws) or for planned future reconstruction. Not routinely indicated.

Specific Considerations for Rehabilitation:
* Pain Control: Adequate pain management is paramount for participation in rehabilitation.
* Patient Education: Patients must be thoroughly educated on their weight-bearing status, precautions, and exercise regimen.
* Interdisciplinary Approach: Close collaboration between orthopedic surgeon, physical therapist, occupational therapist, and nursing staff is essential.
* Monitoring: Regular clinical and radiographic follow-up to assess healing, monitor for complications, and guide progression of rehabilitation. Delayed union or nonunion may necessitate an alteration in the weight-bearing protocol and potentially further surgical intervention.

Summary of Key Literature / Guidelines

The management of femoral neck and shaft fractures is guided by a robust body of literature, consensus guidelines, and biomechanical principles. Adherence to these recommendations is critical for optimal patient outcomes.

General Principles & Guidelines

• AO Principles: The Arbeitsgemeinschaft für Osteosynthesefragen (AO Foundation) principles of fracture management (anatomical reduction, stable fixation, preservation of blood supply, early mobilization) form the bedrock of orthopedic trauma care for both femoral neck and shaft fractures. These principles emphasize restoring form and function through appropriate surgical intervention.
• ATLS Guidelines: For high-energy trauma patients, adherence to Advanced Trauma Life Support (ATLS) protocols is paramount for initial assessment and resuscitation, ensuring life-threatening injuries are addressed before definitive orthopedic intervention.
• Damage Control Orthopedics (DCO): In hemodynamically unstable polytrauma patients, DCO strategies (e.g., temporary external fixation for femoral shaft fractures) are employed to stabilize injuries, minimize the "second hit" phenomenon, and allow for physiological resuscitation before definitive fixation, typically within 3-5 days.

Femoral Neck Fractures

1. Timing of Surgery:
   • Younger Patients (under 60-65 years) with Displaced Fractures: Urgent surgical fixation (ideally within 6 hours) is strongly recommended. Multiple studies (e.g., Bhandari et al., 2004; Zlowodzki et al., 2005) have demonstrated that delays beyond 6-12 hours significantly increase the risk of avascular necrosis (AVN) and nonunion. This is considered an orthopedic emergency.
2. Fixation in Younger Patients:
   • Nondisplaced/Minimally Displaced (Garden I/II): Internal fixation with multiple cannulated screws is the preferred treatment to prevent displacement and promote healing. Screw configuration (inverted triangle) is biomechanically superior.
   • Displaced (Garden III/IV): Anatomical reduction is crucial. Multiple cannulated screws are most commonly used. A Dynamic Hip Screw (DHS) with an anti-rotation screw can provide more stability for basicervical or more comminuted transcervical fractures but requires more soft tissue dissection. The goal is to restore the normal neck-shaft angle and obtain a valgus-impacted reduction if possible.
3. Fixation in Elderly Patients (over 65-70 years):
   • Nondisplaced/Minimally Displaced (Garden I/II): Internal fixation (cannulated screws) remains an option, but consideration for arthroplasty can be made based on bone quality and activity level.
   • Displaced (Garden III/IV): Arthroplasty is the treatment of choice due to high rates of nonunion and AVN with internal fixation.
     • Hemiarthroplasty (HA): Unipolar or bipolar. Provides reliable pain relief and allows early mobilization. Generally preferred for low-demand, less active, or sicker elderly patients. Systematic reviews (e.g., Rogmark & Spetz, 2007) show lower re-operation rates compared to internal fixation.
     • Total Hip Arthroplasty (THA): Offers better long-term function and lower re-operation rates in active, physiologically younger elderly patients with good bone stock or pre-existing symptomatic hip arthritis. Meta-analyses (e.g., Hopley et al., 2010) confirm THA's superiority in function and re-operation rates over HA in this selected group, despite a higher initial dislocation risk.
4. Ipsilateral Femoral Neck and Shaft Fractures:
   • A high index of suspicion is required to diagnose the neck fracture.
   • The consensus is to fix the femoral neck fracture first (e.g., cannulated screws for young patients, arthroplasty for elderly).
   • Subsequent fixation of the femoral shaft can then be performed with an antegrade IM nail (often a reconstructive nail allowing for cephalomedullary screw fixation) or a retrograde IM nail. The sequence prevents potential displacement of the neck fracture during shaft nailing.

Femoral Shaft Fractures

1. Intramedullary (IM) Nailing:
   • Gold Standard: IM nailing is the universally accepted gold standard for nearly all adult femoral shaft fractures (APTA, 2007; AAOS Clinical Practice Guidelines). It offers biomechanical advantages (load sharing, centrally placed implant), high union rates, and allows early weight-bearing.
   • Reamed vs. Unreamed:
     • Reamed Nailing: Generally preferred for closed femoral shaft fractures. Reaming allows for a larger, stiffer nail, provides better cortical contact, and may promote healing by introducing bone graft material into the fracture gap. Meta-analyses (e.g., Bhandari et al., 2000) show higher union rates and lower rates of mechanical failure with reamed nailing, though it carries a theoretical higher risk of fat embolism in specific polytrauma settings.
     • Unreamed Nailing: May be considered in severe polytrauma patients, particularly those with head injuries or pulmonary compromise (ARDS, FES), as it minimizes the "second hit" systemic inflammatory response. Also used for Gustilo-Anderson Type IIIB/IIIC open fractures. However, it is associated with a slightly higher risk of nonunion and hardware failure.
   • Antegrade vs. Retrograde Nailing:
     • Antegrade Nailing: Most common approach. Preferred for midshaft and proximal shaft fractures. Entry point through the piriformis fossa or greater trochanter. Concerns include potential gluteal pain/lurch with piriformis entry and nonunion of proximal fractures with some trochanteric entry points.
     • Retrograde Nailing: Useful for ipsilateral femoral neck fractures, "floating knee" injuries, bilateral femoral shaft fractures, obese patients, or patients with associated pelvic/acetabular injuries. Reduces repositioning. Entry point through the intercondylar notch. Concerns include potential knee pain, hardware irritation, and articular damage.
2. Plate Fixation:
   • Indications: Reserved for specific situations:
     • Fractures with significant metaphyseal extension into the hip or knee joint (e.g., subtrochanteric, supracondylar).
     • Pediatric fractures (epiphyseal sparing).
     • Inability to achieve or maintain reduction with IM nailing.
     • Segmental bone defects requiring bone grafting.
     • Certain highly comminuted open fractures where IM nailing is problematic.
   • Technique: Minimally Invasive Plate Osteosynthesis (MIPO) is favored for diaphyseal fractures to preserve soft tissue and blood supply, promoting biological healing. Locking plates are preferred in osteoporotic bone or comminuted fractures for angular stability.
3. External Fixation:
   • Damage Control Orthopedics: Primary role in temporary stabilization for severely unstable polytrauma patients, open fractures with extensive soft tissue damage, or vascular injuries requiring repair. Allows rapid stabilization and access to other injuries. Definitive fixation is performed once the patient's physiological status and soft tissue envelope improve.

Key Literature & Evidence

• Bhandari M, et al. (2000) Reamed versus unreamed intramedullary nailing of the tibia: a critical analysis of the literature. J Orthop Trauma. While focused on tibia, this paper's methodology and discussion of reaming benefits/risks are applicable to femoral nailing principles.
• Bhandari M, et al. (2004) Does time to surgery affect the outcome of femoral neck fractures? A systematic review. J Bone Joint Surg Am. Highlights the urgency for displaced femoral neck fractures.
• Hopley C, et al. (2010) The surgical management of hip fractures in adults. J Bone Joint Surg Br. Provides a broad overview and discusses evidence for internal fixation versus arthroplasty for femoral neck fractures.
• Rogmark C, Spetz CL. (2007) Hip hemiarthroplasty versus internal fixation for displaced femoral neck fractures in the elderly: a meta-analysis. Acta Orthopaedica. Supports arthroplasty for elderly displaced femoral neck fractures.
• APTA (2007) Appropriate treatment of adult femoral shaft fractures: a clinical practice guideline. Reinforces IM nailing as the gold standard for diaphyseal femur fractures.
• AAOS Clinical Practice Guidelines: Continuously updated, these provide evidence-based recommendations for hip fractures in the elderly and femoral shaft fractures.

In summary, the management of femoral neck and shaft fractures demands a multidisciplinary, evidence-based approach. A thorough understanding of anatomy, careful pre-operative planning, precise surgical technique, and aggressive post-operative rehabilitation are all non-negotiable elements in achieving optimal patient recovery and preventing devastating complications. The mantra "Don't Miss It" particularly applies to subtle neck fractures in the context of shaft injuries, ensuring no component of these complex traumas goes unaddressed.