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FRCS (Tr & Orth) Exam Prep: Interactive MCQ Practice & Viva Domains

Orthopedic Board Exam Prep: Advanced MCQ Engine for FRCS (Tr & Orth) Success

23 Apr 2026 79 min read 177 Views
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Key Takeaway

This platform prepares for FRCS (Tr & Orth) and Orthopedic Board Exams via an advanced MCQ engine. It focuses on high-yield clinical scenarios, like initial management of unstable pelvic ring injuries, offering practice in study or timed exam modes. Detailed explanations and score tracking build comprehensive knowledge for certification success.

Comprehensive Exam


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Question 1

A 35-year-old male presents after a high-energy motor vehicle collision with hemodynamic instability, a palpable hematoma in the left groin, and a pelvic ring injury classified as Young-Burgess LC-III. What is the most appropriate initial management step after fluid resuscitation and basic life support?





Explanation

In hemodynamically unstable patients with pelvic ring injuries, the priority after fluid resuscitation and basic life support is to mechanically stabilize the pelvis to tamponade hemorrhage. A pelvic binder (or sheet) provides rapid temporary mechanical stabilization, reducing the volume of the pelvic cavity and potentially controlling venous bleeding. While angiography is often needed for arterial bleeds, mechanical stabilization is typically the immediate first step. External fixation is a more definitive form of stabilization but may not be as rapid to apply as a binder. Laparotomy is indicated for suspected intra-abdominal hemorrhage, which is a separate consideration from direct pelvic bleeding in LC-III injuries.

Question 2

A 68-year-old female undergoes a cemented total hip arthroplasty. Intraoperatively, she experiences sudden hypoxia, hypotension, and a drop in end-tidal CO2. What is the most likely diagnosis?





Explanation

The constellation of sudden hypoxia, hypotension, and a drop in end-tidal CO2 (due to decreased pulmonary blood flow) occurring during cemented arthroplasty, particularly during femoral canal pressurization, is highly suggestive of Bone Cement Implantation Syndrome (BCIS). This syndrome is thought to be caused by the release of intramedullary contents (fat, bone marrow, air) into the systemic circulation, leading to pulmonary vaso-occlusion and release of vasoactive mediators. While pulmonary embolism is a differential, the acute intraoperative timing with cementing makes BCIS the most likely diagnosis.

Question 3

A 55-year-old male presents with progressive bilateral neurogenic claudication, worse on standing and walking, relieved by sitting or leaning forward. MRI shows severe lumbar spinal stenosis at L4/5. Which surgical approach is generally considered the gold standard for this condition if conservative measures fail?





Explanation

For symptomatic lumbar spinal stenosis that causes neurogenic claudication and has failed conservative management, a decompressive laminectomy (with or without associated facetectomy or foraminotomy) is considered the gold standard surgical procedure. Its primary aim is to relieve neural compression directly. Fusion procedures (ALIF, TLIF) are typically reserved for cases with associated instability, significant deformity, or iatrogenic instability created by extensive decompression. Microdiscectomy is primarily for disc herniation, and artificial disc replacement is for discogenic back pain without stenosis or instability.

Question 4

A 6-month-old infant is diagnosed with a dislocatable hip on the Ortolani maneuver. Radiographs show a dislocated left hip with an acetabular index of 35 degrees. What is the most appropriate initial treatment?





Explanation

For an infant aged 0-6 months (and often up to 9 months) with a dislocatable or reducible dislocated hip (Developmental Dysplasia of the Hip - DDH), the Pavlik harness is the gold standard initial treatment. It maintains the hips in gentle flexion and abduction, promoting concentric reduction and encouraging normal acetabular development. Closed reduction under general anesthesia and spica casting are typically reserved for older infants or failures of Pavlik harness treatment. Open reduction is indicated for irreducible dislocations.

Question 5

A 28-year-old semi-professional football player sustains a non-contact injury to his knee during a game, describing a 'pop' and immediate swelling. Lachman test is positive with a soft endpoint. MRI confirms an isolated ACL tear. He wishes to return to high-level sport. What is the primary goal of ACL reconstruction in this athlete?





Explanation

The primary goal of ACL reconstruction in a young, active athlete, especially one aspiring to return to high-level sports, is to restore the normal kinematics and anterior-posterior/rotational stability of the knee. This functional stability is crucial to prevent episodes of giving way and allow the athlete to perform cutting, pivoting, and jumping activities confidently. While preventing meniscal injury and reducing the risk of osteoarthritis are important secondary benefits, they are consequences of achieving knee stability. Achieving full range of motion and early weight-bearing are rehabilitation goals rather than the direct primary surgical objective.

Question 6

A 14-year-old male presents with right distal femur pain and swelling for 3 months. Radiographs show a lytic lesion with a Codman's triangle and sunburst periosteal reaction. Biopsy confirms osteosarcoma. What is the most critical investigation for staging and treatment planning?





Explanation

Osteosarcoma has a significant propensity for pulmonary metastasis, which is the most common site of distant spread. Therefore, a CT scan of the chest is the most critical investigation for staging, as the presence of lung metastases significantly impacts prognosis and dictates the extent of systemic treatment (e.g., neoadjuvant chemotherapy). While MRI of the affected limb is crucial for local staging and surgical planning, and a bone scan for other osseous metastases, identifying pulmonary metastases is paramount for systemic staging and overall treatment strategy.

Question 7

A 40-year-old carpenter falls onto an outstretched hand and complains of severe wrist pain, particularly on the ulnar side. Physical exam reveals tenderness in the 'fovea' between the extensor carpi ulnaris and the flexor carpi ulnaris. X-rays are normal. What is the most likely injury?





Explanation

A fall onto an outstretched hand (FOOSH) can cause various wrist injuries. Ulnar-sided wrist pain, especially with tenderness in the 'fovea' (the soft spot distal to the ulnar styloid between the ECU and FCU tendons), is a classic clinical sign of a Triangular Fibrocartilage Complex (TFCC) tear, particularly involving its foveal attachment. Normal X-rays are common as the TFCC is a soft tissue structure. While other carpal injuries like lunotriquetral tears can cause ulnar wrist pain, fovea tenderness is highly specific for TFCC pathology.

Question 8

A 60-year-old female presents with progressive pain and deformity in her hindfoot, worse with activity. She has a flexible flatfoot deformity with abduction of the forefoot. Examination reveals tenderness along the medial ankle and inability to perform a single-leg heel raise. What is the most likely diagnosis?





Explanation

This clinical picture is highly characteristic of Posterior Tibial Tendon Dysfunction (PTTD), specifically Stage II. Key features include an adult-acquired flexible flatfoot deformity, forefoot abduction (the 'too many toes' sign), pain and tenderness along the course of the posterior tibial tendon (medial ankle), and inability to perform a single-leg heel raise (indicating significant weakness of the posterior tibial tendon, which is crucial for dynamic arch support). While the spring ligament is often involved in the progression of the deformity, PTTD is the overarching diagnosis.

Question 9

During a total knee arthroplasty, the surgeon aims to achieve a balanced soft tissue envelope. What principle describes the ideal state where ligamentous tension is uniform throughout the range of motion?





Explanation

Isometry, in the context of knee kinematics and ligamentous balance, refers to the property where the distance between the origins and insertions of the collateral ligaments remains relatively constant throughout the range of motion. Achieving this during total knee arthroplasty (via appropriate implant positioning and soft tissue releases) is crucial for ensuring uniform ligamentous tension, which contributes significantly to knee stability, kinematics, and overall function. Ligament balancing is the technique used to achieve this.

Question 10

A 48-year-old male sustains a comminuted, intra-articular fracture of the distal radius (AO type C3) with significant metaphyseal comminution and displacement. He is an active manual labourer. What is the most appropriate surgical treatment to optimize functional outcomes in this patient?





Explanation

For unstable, comminuted, intra-articular distal radius fractures (AO type C3), especially in active individuals requiring optimal functional outcomes and early return to work, volar locking plate fixation has become the preferred surgical treatment. It provides strong, stable fixation that allows for accurate anatomical reduction (particularly of the articular surface) and facilitates early range of motion, which is crucial for preventing stiffness and achieving the best possible functional recovery. Other methods like K-wires or external fixation are typically less stable for such complex fractures or may not allow for immediate mobilization.

Question 11

A 72-year-old obese male with severe tricompartmental osteoarthritis undergoes a total knee arthroplasty. Postoperatively, he develops a warm, red, painful knee with purulent discharge from the wound. CRP and ESR are significantly elevated. What is the most appropriate initial management for this suspected acute periprosthetic joint infection (PJI)?





Explanation

For any suspected acute periprosthetic joint infection (PJI), the absolute initial management step is diagnostic aspiration of the joint. This allows for synovial fluid cell count (white blood cell count and neutrophil percentage) and culture, which are essential for confirming the diagnosis, identifying the causative organism, and guiding targeted antibiotic therapy. The subsequent surgical management (e.g., DAIR or two-stage revision) depends on the culture results, chronicity of infection, and host factors, but diagnosis is paramount first.

Question 12

A 25-year-old male falls from a height and presents with acute severe back pain and neurological deficits in his lower limbs. CT scan shows a burst fracture of L1 with significant retropulsion into the spinal canal and canal compromise of 50%. What is the most appropriate surgical management strategy for this unstable fracture with neurological compromise?





Explanation

For an unstable thoracolumbar burst fracture with significant canal compromise and neurological deficit, surgical intervention is indicated. A posterior approach with pedicle screw fixation and direct or indirect decompression (e.g., laminectomy or posterolateral decompression) is a widely accepted and effective strategy. It allows for stabilization of the fracture and adequate decompression of the neural elements, often achievable in a single stage. Anterior approaches are also valid but might be considered for isolated anterior column reconstruction or specific kyphotic deformities, sometimes requiring a two-stage procedure. Vertebroplasty and kyphoplasty are not suitable for unstable fractures with neurological deficits.

Question 13

A 7-year-old child falls from a tree and sustains a supracondylar humerus fracture (Gartland type III). Distal pulses are palpable but weak. There is no sensory deficit. What is the immediate management priority after initial assessment?





Explanation

In a Gartland Type III supracondylar humerus fracture, particularly with signs of impending vascular compromise (weak pulse), urgent closed reduction and percutaneous pinning is the immediate management priority. Reduction of the fracture often relieves kinking or compression of the brachial artery, restoring normal blood flow. If the pulse does not improve after successful reduction and pinning, or if there are clear signs of ongoing ischemia, then further investigation such as Doppler ultrasound or formal vascular exploration would be considered. Observation is insufficient given the vascular concerns.

Question 14

A 30-year-old rugby player presents with recurrent anterior shoulder dislocations. He has a positive apprehension test and a significant Hill-Sachs lesion on MRI. On physical examination, he demonstrates hyperlaxity. Which surgical procedure is most appropriate to reduce the risk of recurrent dislocation in this patient?





Explanation

In a young, active athlete involved in contact sports, with recurrent anterior shoulder instability, a significant Hill-Sachs lesion, and especially with hyperlaxity or documented glenoid bone loss, the Latarjet procedure is often the most appropriate surgical choice. The Latarjet procedure addresses glenoid bone loss and provides a sling effect (conjoint tendon transfer), significantly reducing recurrence rates in this high-risk population, where isolated soft tissue repairs (Bankart) may have higher failure rates. Remplissage is for engaging Hill-Sachs lesions without significant glenoid bone loss.

Question 15

A 50-year-old female presents with a slowly growing, painless mass in her posterior thigh that has been present for 6 months. It is firm and measures 5x3 cm. MRI shows a well-defined, heterogeneous mass with signal characteristics suggestive of a soft tissue sarcoma. What is the most appropriate next diagnostic step?





Explanation

For a suspected soft tissue sarcoma, a core needle biopsy is the most appropriate next diagnostic step. It provides adequate tissue for histological diagnosis and grading without contaminating a large area of tissue, which is critical for future limb-sparing surgery. The biopsy tract must be carefully planned by or with an experienced musculoskeletal oncologist to ensure it can be completely excised en bloc with the tumor. Incisional or excisional biopsies are generally avoided for suspected sarcomas due to the risk of tumor seeding and complicating definitive surgical margins. FNA often yields insufficient tissue for definitive diagnosis and grading. PET scans are used for staging, not primary diagnosis.

Question 16

A 55-year-old seamstress complains of pain and swelling at the base of her thumb, worse with gripping and pinching. Physical examination reveals tenderness at the carpometacarpal (CMC) joint of the thumb and a positive grind test. Radiographs show advanced CMC joint osteoarthritis. What is the most effective surgical treatment for advanced symptomatic CMC joint osteoarthritis?





Explanation

For advanced, symptomatic osteoarthritis of the thumb carpometacarpal (CMC) joint that has failed conservative management, trapeziectomy with ligament reconstruction and tendon interposition (LRTI) is widely considered the most effective and gold standard surgical treatment. This procedure involves removing the painful trapezium and stabilizing the thumb metacarpal base, creating a space that fills with scar tissue or is occupied by a tendon interposition. Arthrodesis sacrifices motion, and prosthetic replacements have variable long-term success. Corticosteroid injections are conservative measures.

Question 17

A 30-year-old male sustains a twisting injury to his ankle while playing basketball. He has significant pain and swelling over the lateral malleolus. X-rays show a spiral fracture of the distal fibula extending proximally, with widening of the medial clear space and an intact deltoid ligament on stress views. What is the most appropriate classification for this injury?





Explanation

This describes a classic Maisonneuve fracture. It is an external rotation injury characterized by a spiral fracture of the proximal fibula (often extending into the shaft, as described by 'distal fibula extending proximally'), associated with disruption of the syndesmotic ligaments, and medial ankle injury (either a deltoid ligament rupture or medial malleolus fracture). The widening of the medial clear space indicates medial ankle instability. While the description mentions an 'intact deltoid ligament on stress views,' significant medial clear space widening implies functional compromise of the medial stabilizers, even if the main deltoid fibers are not overtly torn or it's a subtle injury combined with syndesmotic failure. The high fibula fracture is the key distinguishing feature differentiating it from Weber type ankle fractures which are limited to the distal fibula.

Question 18

A histological slide from a bone biopsy shows abundant osteoclasts, multinucleated giant cells, and reactive bone formation, typical of a lytic lesion. Which of the following bone tumours most commonly exhibits this histological appearance?





Explanation

Giant cell tumour of bone (GCTB) is characterized histologically by a proliferation of mononuclear stromal cells and numerous, evenly distributed multinucleated giant cells that resemble osteoclasts. These features, typically found in a lytic bone lesion, are classic for GCTB. Osteosarcoma and chondrosarcoma have malignant osteoid and cartilage matrix respectively, while Ewing sarcoma is a small round blue cell tumour. Enchondroma is a benign cartilaginous lesion.

Question 19

A 40-year-old male with a history of intravenous drug use presents with septic arthritis of the sacroiliac joint. He is febrile and has severe gluteal pain, worsened by hip flexion and abduction. What is the most appropriate initial management?





Explanation

For suspected septic arthritis of the sacroiliac (SI) joint, especially in a high-risk patient like an intravenous drug user, the immediate priority after clinical suspicion is to confirm the diagnosis and identify the causative organism. A CT-guided aspiration allows for accurate fluid sampling for culture and Gram stain, as well as initial drainage of pus. Once the pathogen is identified, targeted intravenous antibiotics can be initiated. Oral antibiotics alone are insufficient for septic arthritis, and open surgical debridement is reserved for cases that fail percutaneous drainage or have extensive abscess formation.

Question 20

A 65-year-old male undergoes revision total hip arthroplasty for aseptic loosening. Intraoperatively, during femoral component extraction, a longitudinal fracture of the distal femur occurs. What is the classification of this intraoperative fracture typically associated with revision hip arthroplasty?





Explanation

The Vancouver classification system is widely used for periprosthetic femoral fractures. A Vancouver Type C fracture is defined as a fracture that occurs distal to the tip of the femoral stem. Type B fractures involve the area around the stem (B1: well-fixed stem, B2: loose stem, B3: loose stem with poor bone stock). Type A fractures are trochanteric. The description clearly states the fracture is distal to the stem tip.

Question 21

A 15-year-old female presents with progressive thoracic scoliosis, measuring 55 degrees Cobb angle with significant trunk rotation and rib hump. She is Risser 4. What is the most appropriate treatment recommendation?





Explanation

For adolescent idiopathic scoliosis, a Cobb angle exceeding 45-50 degrees is an indication for surgical spinal fusion, regardless of the Risser sign (skeletal maturity). While a Risser 4 indicates near-skeletal maturity, curves of this magnitude have a high likelihood of continued progression into adulthood and can lead to significant functional limitations and cosmetic deformity. Bracing is typically used for curves between 25-45 degrees in skeletally immature patients. Observation is for smaller curves.

Question 22

A 4-year-old child presents with a painless limp. Radiographs of the hip show flattening and fragmentation of the femoral epiphysis. ESR and CRP are normal. What is the most likely diagnosis?





Explanation

This clinical presentation is classic for Legg-Calvé-Perthes disease, which is idiopathic avascular necrosis of the femoral head in children, typically affecting those between 4 and 8 years of age. A painless limp is a common symptom, and radiographs showing flattening and fragmentation of the femoral epiphysis are diagnostic. Normal inflammatory markers (ESR, CRP) help differentiate it from infectious or inflammatory conditions like septic arthritis or juvenile idiopathic arthritis. SCFE typically affects older, often obese, adolescents.

Question 23

A 25-year-old athlete sustains a severe inversion injury to her ankle. She reports a 'pop' and significant swelling. Physical exam reveals gross instability of the ankle mortise on stress radiographs. Which ligament is most commonly injured in severe ankle inversion sprains?





Explanation

The anterior talofibular ligament (ATFL) is the weakest and most commonly injured ligament in ankle inversion sprains, often as an isolated injury or as the first to rupture in a more severe injury. In severe inversion injuries leading to gross instability, the ATFL is almost certainly ruptured, frequently in conjunction with the calcaneofibular ligament (CFL) and sometimes the posterior talofibular ligament (PTFL). The deltoid ligament is on the medial side and is injured with eversion. Syndesmotic ligaments are injured with external rotation or high-energy trauma.

Question 24

A 60-year-old male with a known history of prostate cancer presents with sudden onset of severe right femoral pain after a minor fall. X-rays show a lytic lesion in the subtrochanteric region of the femur with cortical breakthrough. What is the most appropriate immediate management for this impending or actual pathological fracture?





Explanation

This scenario describes an impending or actual pathological fracture due to metastatic bone disease. A lytic lesion with cortical breakthrough in a high-stress area like the subtrochanteric region of the femur carries a very high risk of complete fracture. The most appropriate immediate management is prophylactic internal fixation (e.g., with an intramedullary nail) to prevent a catastrophic complete fracture, stabilize the bone, and provide immediate pain relief. Radiation therapy, bisphosphonates, and chemotherapy are important adjunctive treatments for the underlying disease and pain control, but they do not address the immediate mechanical instability. Observation is inappropriate given the impending or actual fracture.

Question 25

A 50-year-old female presents with numbness and tingling in her thumb, index, middle, and radial half of the ring finger, worse at night. Phalen's test is positive. What is the most common anatomical structure implicated in the compression causing these symptoms?





Explanation

This is a classic presentation of carpal tunnel syndrome, which is caused by compression of the median nerve as it passes through the carpal tunnel. While the transverse carpal ligament (also known as the flexor retinaculum) forms the roof of the carpal tunnel and is often the primary compressive structure, the question asks for the 'anatomical structure implicated in the compression,' which is ultimately the median nerve itself. Therefore, the most direct and precise answer is the median nerve within the carpal tunnel. The ulnar and radial nerves have different sensory distributions.

Question 26

A 45-year-old runner complains of burning pain and numbness in her toes, particularly the plantar surface of the first three toes. Symptoms are exacerbated by prolonged standing and relieved by rest. Tinel's sign is positive behind the medial malleolus. Which nerve is most likely entrapped?





Explanation

This constellation of symptoms is highly characteristic of tarsal tunnel syndrome, which results from compression of the tibial nerve (or its branches) as it passes through the tarsal tunnel behind the medial malleolus. The burning pain and numbness in the plantar surface of the toes, exacerbation with activity, and a positive Tinel's sign behind the medial malleolus are all classic findings for tibial nerve entrapment. Other nerves listed have different sensory distribution patterns.

Question 27

A surgeon is evaluating a non-union in a long bone. The fracture site shows hypertrophic callus but no bridging across the gap, indicating inadequate stability. What is the primary biological stimulant for callus formation in bone healing?





Explanation

While all options play a role in bone healing, interfragmentary strain (the amount of motion or micromovement at the fracture site) is the primary mechanical stimulant for callus formation. Too much strain (inadequate stability) can lead to a hypertrophic non-union where abundant callus forms but fails to bridge the gap (as described). A moderate, controlled amount of strain stimulates robust callus formation, while very rigid fixation (minimal strain) leads to primary bone healing with little to no callus. Vascularity, oxygen tension, local growth factors, and systemic hormones are critical biological factors, but strain is the key mechanical driver of callus.

Question 28

A 28-year-old male sustains a high-energy trauma leading to a Gustilo-Anderson Type II open femoral shaft fracture. What is the most critical initial step in managing this open fracture?





Explanation

For any open fracture, the absolute immediate priority after initial assessment and basic life support is the administration of intravenous broad-spectrum antibiotics and tetanus prophylaxis. This intervention significantly reduces the risk of infection, which is the most devastating complication of open fractures. While surgical debridement and irrigation are critical and should be performed urgently (ideally within 6 hours), antibiotics should be administered even before the patient reaches the operating theatre. Other steps like stabilization and angiogram follow, and primary wound closure is generally contraindicated in open fractures.

Question 29

A 70-year-old female with chronic rotator cuff arthropathy (cuff tear arthropathy) presents with severe shoulder pain and loss of active elevation. Radiographs show superior migration of the humeral head and glenoid erosion. She has failed conservative management. What is the most appropriate surgical treatment?





Explanation

Reverse total shoulder arthroplasty (rTSA) is the gold standard surgical treatment for rotator cuff arthropathy. This condition is characterized by a massive, irreparable rotator cuff tear leading to superior migration of the humeral head, glenoid erosion, and pseudoparalysis. By reversing the ball-and-socket configuration, rTSA medializes and inferiorizes the center of rotation, allowing the deltoid muscle to function effectively even in the absence of a functional rotator cuff, thereby restoring active elevation and alleviating pain. Anatomic total shoulder arthroplasty requires an intact or reparable rotator cuff, which is not the case here.

Question 30

A 60-year-old diabetic male presents with insidious onset of severe back pain, fever, and weight loss. MRI shows discitis and osteomyelitis at L3/4 with epidural abscess formation. What is the most appropriate initial management approach?





Explanation

For suspected vertebral osteomyelitis and discitis with an epidural abscess, particularly in an immunocompromised patient like a diabetic, the initial management requires definitive diagnosis and identification of the causative organism. A CT-guided biopsy and culture are crucial to obtain tissue for microbiological analysis. Once the organism and its sensitivities are known, targeted intravenous antibiotics should be initiated. Urgent surgical decompression and debridement are indicated if there is neurological deficit, progressive deformity, or failure of medical management. Oral antibiotics alone are insufficient.

Question 31

A newborn is noted to have a clubfoot (talipes equinovarus) deformity. What is the preferred initial treatment for idiopathic clubfoot in a neonate?





Explanation

The Ponseti method of serial casting is the universally accepted gold standard and preferred initial treatment for idiopathic clubfoot in neonates and young infants. It involves a specific sequence of gentle manipulations and weekly cast changes to gradually correct the deformity, often followed by a percutaneous Achilles tenotomy and then bracing. This method has largely superseded older casting techniques (like the Kite method) and initial surgical releases due to its high success rates and avoidance of extensive surgery.

Question 32

A 32-year-old professional dancer complains of deep groin pain, worse with hip flexion and internal rotation. She also reports clicking and catching sensations. MRI shows a labral tear and pincer-type femoroacetabular impingement (FAI). What is the most appropriate surgical treatment to address both the labral tear and the underlying bony impingement?





Explanation

For symptomatic femoroacetabular impingement (FAI), whether cam, pincer, or mixed, with an associated labral tear, the definitive surgical treatment is arthroscopic osteochondroplasty. This procedure involves reshaping the non-spherical femoral head-neck junction (for cam lesions) and/or trimming the excessive acetabular rim (for pincer lesions) to eliminate the impingement, and typically involves repairing or debriding the labral tear. This addresses both the underlying bony morphology causing the impingement and the resulting soft tissue damage. Isolated labral debridement does not address the cause, and hip arthroplasty is for end-stage arthritis.

Question 33

A 10-year-old male presents with a painful, small (1cm) lesion in the cortical bone of the proximal femur. Radiographs show a lucent nidus surrounded by a rim of sclerotic bone. Pain is worse at night and relieved by NSAIDs. What is the most likely diagnosis?





Explanation

This is a classic description of an osteoid osteoma. It is a benign bone-forming tumour typically presenting in young patients with localized pain that is often worse at night and characteristically relieved by non-steroidal anti-inflammatory drugs (NSAIDs). Radiographically, it appears as a small (usually <1.5 cm) lucent nidus surrounded by a dense sclerotic reactive bone. Other options have different clinical presentations and radiographic features.

Question 34

A 25-year-old male punches a wall and develops pain and swelling over the dorsal aspect of his small finger MCP joint. X-rays reveal a fracture at the neck of the 5th metacarpal with volar angulation of 40 degrees. What is the maximum acceptable volar angulation for a 5th metacarpal neck fracture that can typically be managed non-operatively in an active adult?





Explanation

For 5th metacarpal neck fractures (Boxer's fractures), the maximum acceptable volar angulation for non-operative management varies, but generally, 30 degrees is considered the upper limit in an active adult. While some surgeons may accept up to 40 degrees in the 5th metacarpal (more so than in the 2nd or 3rd due to greater intrinsic mobility of the 4th and 5th rays), angulation beyond 30 degrees can lead to a noticeable extensor lag, reduced grip strength, and a poorer cosmetic outcome. Therefore, 30 degrees represents a more conservative and often preferred threshold for surgical intervention.

Question 35

A 65-year-old female presents with a painful bunion deformity (hallux valgus). She has failed conservative management. Clinical examination shows a painful hallux valgus angle of 35 degrees and an intermetatarsal angle of 18 degrees. What is the most appropriate surgical procedure for this deformity?





Explanation

For moderate to severe hallux valgus deformities (typically Hallux Valgus Angle >30 degrees and Intermetatarsal Angle >15 degrees, as seen here with HVA 35 and IMA 18), a proximal first metatarsal osteotomy (such as a Ludloff, Scarf, or crescentic osteotomy) combined with a distal soft tissue release (McBride-type) is generally indicated. This combination allows for significant correction of both the intermetatarsal angle and the hallux valgus angle. A Chevron osteotomy (distal metatarsal osteotomy) is usually reserved for mild-to-moderate deformities (IMA <15 degrees). Akin osteotomy is a phalangeal osteotomy used for residual hallux valgus and is often combined with metatarsal osteotomies. Cheilectomy is for hallux rigidus.

Question 36

A surgeon is considering different bone graft options for a non-union. Which type of bone graft provides the most robust osteoinductive and osteoconductive properties?





Explanation

Autogenous cancellous bone graft is considered the 'gold standard' for bone grafting due to its unparalleled biological properties. It possesses osteogenic potential (containing viable osteoblasts and mesenchymal stem cells), osteoinductive properties (containing growth factors like BMPs), and osteoconductive properties (providing a scaffold for new bone growth). No other graft material possesses all three properties to the same robust degree. Demineralized bone matrix (DBM) is osteoinductive and osteoconductive but not osteogenic. Cortical allograft is primarily osteoconductive. Synthetic grafts are mainly osteoconductive. BMPs are highly osteoinductive but require a carrier and lack osteogenic cells.

Question 37

A 40-year-old male is admitted with multiple injuries after a high-speed motor vehicle collision, including an unstable pelvic fracture, a closed femoral shaft fracture, and a closed head injury with GCS 10. He is hemodynamically stable after initial resuscitation. When is definitive fixation of the femoral shaft fracture generally considered most appropriate in a polytrauma patient with a GCS of 10?





Explanation

In polytrauma patients, particularly those with a significant head injury (GCS <12) or other severe systemic injuries (e.g., severe chest or abdominal trauma), the principles of 'damage control orthopaedics' (DCO) are applied. This involves initial temporary stabilization (often external fixation) of long bone fractures to control hemorrhage and pain, followed by definitive fixation (e.g., intramedullary nailing) after 3-7 days. This delay allows the patient to stabilize physiologically, avoids a 'second hit' phenomenon from major surgery during the acute inflammatory phase, and allows for better neurological assessment for head injuries. 'Early total care' (fixation within 24 hours) is typically reserved for hemodynamically stable patients without severe associated systemic injuries.

Question 38

A 70-year-old female with a well-fixed, uncemented femoral stem from a prior total hip arthroplasty sustains a fall and develops a periprosthetic fracture distal to the tip of the stem (Vancouver Type C). The stem is not loose. What is the most appropriate surgical treatment?





Explanation

A Vancouver Type C periprosthetic femoral fracture is defined as a fracture distal to the tip of a well-fixed femoral stem. The treatment aims to stabilize the fracture without needing to revise the well-functioning prosthesis. This is typically achieved with open reduction and internal fixation using a plate and screws, often supplemented with cerclage wires. The plate spans the fracture, extending well proximal and distal to it. Revision of the stem (options B and C) is not indicated if the stem is well-fixed. Non-operative management is rarely successful for unstable periprosthetic fractures.

Question 39

A 65-year-old male presents with worsening back pain and new onset neurological deficit (foot drop). MRI reveals a metastatic lesion compressing the spinal cord at T10, originating from lung cancer. What is the most appropriate immediate management for symptomatic spinal cord compression due to metastasis?





Explanation

For symptomatic metastatic spinal cord compression (MSCC) with new onset or progressing neurological deficit (like foot drop), the immediate management involves two critical steps: first, high-dose corticosteroids (e.g., dexamethasone) to reduce peritumoral edema, and second, urgent surgical decompression to relieve pressure on the spinal cord. Rapid decompression is crucial to maximize the chances of neurological recovery. While external beam radiation therapy (EBRT) is an important part of treatment for MSCC, especially as an adjunct to surgery or for patients without neurological deficits, surgical decompression is prioritized for patients with neurological compromise.

Question 40

A 12-year-old female sustains a Salter-Harris Type II fracture of the distal tibia. What is the primary concern with Salter-Harris fractures, particularly Type II and above?





Explanation

The primary and most significant concern with Salter-Harris growth plate fractures, particularly Types II, III, IV, and V, is the potential for damage to the physis (growth plate). This damage can lead to premature physeal arrest (growth arrest), resulting in limb length discrepancy or angular deformity as the child grows. While malunion can occur, growth arrest is a unique and critical complication specific to physeal injuries that can have long-term functional consequences.

Question 41

A 28-year-old athlete has a symptomatic focal chondral defect (Outerbridge Grade IV, 2cm diameter) on the medial femoral condyle following an osteochondral injury. Which surgical technique is best suited for treating symptomatic focal chondral defects in young, active patients, aiming for hyaline-like cartilage repair?





Explanation

For symptomatic, focal, full-thickness chondral defects (Outerbridge Grade IV), especially those larger than 1.5-2 cm² in young, active patients, Autologous Chondrocyte Implantation (ACI) is a surgical technique that aims to regenerate hyaline-like cartilage. Microfracture typically leads to the formation of less durable fibrocartilage. Osteochondral Autograft Transfer System (OATS) can transfer hyaline cartilage but is limited by donor site morbidity and the size of the defect it can address. Debridement and lavage are palliative, and partial knee replacement is for arthritic changes, not isolated defects.

Question 42

A 60-year-old male has a newly identified lytic lesion in the proximal humerus on routine X-ray. He has no previous cancer history. What is the ideal approach for biopsy of a suspected primary bone tumour in a weight-bearing long bone or near a joint?





Explanation

For a suspected primary bone tumour, a core needle biopsy is generally the ideal and preferred approach. It is minimally invasive, provides adequate tissue for accurate diagnosis and grading, and, critically, minimizes the risk of contaminating surrounding tissues compared to open incisional or excisional biopsies. The biopsy tract must be carefully planned by or with an experienced musculoskeletal oncologist to ensure it can be completely excised en bloc with the definitive tumour resection to avoid seeding. Fine needle aspiration (FNA) often provides insufficient tissue for accurate diagnosis and grading of bone tumours.

Question 43

A 30-year-old male presents with a 'drop wrist' deformity after falling asleep with his arm draped over a chair. He has weakness in wrist and finger extension but preserved sensation on the dorsum of the hand. Which nerve is most likely affected?





Explanation

A 'drop wrist' deformity, characterized by weakness in wrist and finger extension, is a classic sign of radial nerve palsy. When the injury occurs at or above the spiral groove of the humerus (as with 'Saturday night palsy' from compression, often by draping the arm over a chair), it typically affects both the motor branches to the wrist/finger extensors and the sensory branch to the dorsum of the hand (superficial radial nerve). However, if sensation on the dorsum of the hand is preserved, it indicates that the superficial radial nerve may have been spared or its sensory function is less affected, still pointing to a high radial nerve compression. If the posterior interosseous nerve (PIN) were affected, wrist extension would typically be preserved (due to sparing of ECRL/ECRB), but finger extension would be weak.

Question 44

A 45-year-old weekend warrior sustains a sudden, sharp pain in his calf while playing squash, feeling like he was 'shot in the leg.' He has a palpable gap in the Achilles tendon and a positive Thompson test. What is the most appropriate management for a complete Achilles tendon rupture in an active individual, aiming for early return to sport?





Explanation

For active individuals with a complete Achilles tendon rupture who desire an early return to sport and wish to minimize the risk of re-rupture, surgical repair (open or percutaneous) followed by a structured rehabilitation protocol is generally preferred over non-operative management. Open surgical repair is often considered the gold standard for robust repair and offers a lower re-rupture rate, allowing for a more predictable and faster return to high-level activity. Functional bracing and progressive weight-bearing are components of the post-operative rehabilitation, not the primary treatment for the rupture itself in this context. Corticosteroid injections are contraindicated for tendon ruptures.

Question 45

A patient presents with suspected avascular necrosis (AVN) of the femoral head. Plain radiographs are initially normal. Which imaging modality is most sensitive for early detection of avascular necrosis of the femoral head?





Explanation

Magnetic Resonance Imaging (MRI) is the most sensitive imaging modality for the early detection of avascular necrosis (AVN) of the femoral head. It can identify characteristic changes (e.g., bone marrow edema, a 'double-line sign' at the reactive interface) even before they are visible on plain radiographs, bone scans, or CT scans. Early diagnosis allows for potentially joint-preserving interventions. Other modalities are either less sensitive or used for later stages or other purposes.

Question 46

A 20-year-old male sustains a mid-shaft clavicle fracture with 100% displacement and 2 cm of shortening. He is a keen weightlifter and desires the fastest and most reliable return to activity. What is the most appropriate management for this fracture to optimize outcome and early return to sport?





Explanation

While many clavicle fractures can be treated non-operatively, significant displacement (>100%), shortening (>1.5-2 cm), or comminution are increasingly recognized indications for surgical fixation, especially in young, active patients, overhead athletes, or those demanding a fast and reliable return to high-level activity. Open reduction and internal fixation with plate and screws is the most common and effective method, providing stable fixation, restoring anatomical alignment, and allowing for early mobilization and rehabilitation, which typically leads to a faster and more predictable return to sport compared to non-operative management for these specific fracture patterns.

Question 47

A 35-year-old male undergoes a total hip arthroplasty. He is very active and has a long life expectancy. The surgeon wants to minimize wear debris and maximize implant longevity. Which bearing surface combination is generally associated with the lowest wear rates in total hip arthroplasty?





Explanation

Ceramic-on-ceramic (CoC) bearing surfaces in total hip arthroplasty are generally associated with the lowest wear rates and negligible wear debris generation compared to other common bearing surface combinations. This makes CoC an attractive option for young, active patients with a long life expectancy where minimizing wear and the risk of osteolysis (a common long-term complication of wear debris) is paramount. Metal-on-metal has fallen out of favor due to concerns about metal ion release and pseudotumor formation.

Question 48

A 40-year-old female presents with chronic low back pain that radiates down her left leg to the foot, associated with numbness in the dorsum of the foot. Her straight leg raise is positive at 30 degrees. MRI shows a large L4/5 disc herniation. Which nerve root is most likely compressed?





Explanation

A disc herniation at the L4/5 level typically compresses the L5 nerve root. The clinical presentation described is classic for L5 radiculopathy: pain radiating down the lateral aspect of the thigh and leg to the dorsum of the foot, numbness in the L5 dermatome (dorsum of the foot, particularly the first web space), and a positive straight leg raise. Motor weakness, if present, would involve ankle dorsiflexion (foot drop) and toe extension. An L5 radiculopathy is distinct from L4 (knee extension weakness, medial leg/foot numbness) or S1 (ankle plantarflexion weakness, lateral foot numbness, diminished ankle reflex).

Question 49

A 13-year-old obese male presents with a painful limp and external rotation of the affected leg. Radiographs of the hip show a posterior and inferior displacement of the capital femoral epiphysis relative to the femoral neck. What is the most appropriate initial management?





Explanation

This clinical picture is classic for Slipped Capital Femoral Epiphysis (SCFE). The immediate priority in managing SCFE, especially in a potentially unstable or acute on chronic slip, is to make the child immediately non-weight bearing on the affected limb. This prevents further slippage of the femoral head, which can worsen the deformity and significantly increase the risk of devastating complications such as avascular necrosis. Once non-weight bearing, the definitive treatment typically involves in situ percutaneous screw fixation to stabilize the physis.

Question 50

A 25-year-old male sustains a tibia shaft fracture. Six hours post-injury, he complains of increasing pain disproportionate to the injury, pain on passive stretching of the toes, and numbness between the first and second toes. Distal pulses are palpable. What is the most appropriate immediate intervention?





Explanation

This clinical scenario describes acute compartment syndrome of the lower leg. The cardinal signs are pain out of proportion to the injury, pain on passive stretching of the muscles in the affected compartment (e.g., toe extension for anterior compartment), and early neurological deficits (numbness in the first web space indicates deep peroneal nerve involvement). It is critical to recognize that distal pulses can remain palpable even with severe compartment syndrome. Urgent fasciotomy is the only definitive treatment to relieve the elevated intracompartmental pressures and prevent irreversible tissue damage (muscle ischemia and nerve injury). While removing constrictive dressings can be helpful, it is insufficient if compartment syndrome is already established. Delaying for compartment pressure monitoring in a clear clinical case is often not advisable, as the diagnosis is primarily clinical.

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Dr. Mohammed Hutaif
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