Creator: Dr. Mohammed hutaif
Published: 2026-04-12T14:30:22.648900+00:00

Key Takeaway

Elbow dislocations are the second most common major joint dislocation in adults. While simple dislocations are typically managed with closed reduction and early mobilization, complex fracture-dislocations and isolated radial head instability often necessitate surgical intervention. This guide details the biomechanics, indications, and step-by-step operative techniques for managing elbow instability, including primary repair and annular ligament reconstruction, ensuring optimal functional recovery and joint stability.

ELBOW DISLOCATIONS: EPIDEMIOLOGY AND BIOMECHANICS

The elbow is the second most common major joint dislocated in the adult population, surpassed only by the glenohumeral joint. The inherent stability of the elbow relies on a highly congruent osseous articulation—primarily the ulnohumeral joint—augmented by a robust capsuloligamentous complex. Approximately 20% of all elbow dislocations are associated with concomitant fractures, transforming a "simple" dislocation into a "complex" fracture-dislocation.

Understanding the pathoanatomy of elbow instability requires a thorough grasp of the Horii circle of soft-tissue disruption. Dislocation typically occurs in a predictable progression from lateral to medial:
* Stage 1: Disruption of the lateral ulnar collateral ligament (LUCL), resulting in posterolateral rotatory instability (PLRI).
* Stage 2: Progressive tearing of the anterior and posterior capsule.
* Stage 3: Disruption of the medial collateral ligament (MCL) complex, culminating in complete dislocation.

Clinical Pearl: The anterior band of the MCL is the primary restraint to valgus stress, while the LUCL is the primary restraint to varus and posterolateral rotatory stress. Surgical reconstruction must respect these distinct biomechanical roles to restore functional kinematics.

MANAGEMENT OF SIMPLE ELBOW DISLOCATIONS

Acute, simple dislocations of the elbow (those without associated fractures) are almost universally reducible by closed methods in the emergency department. Following a successful closed reduction, the majority of these joints demonstrate adequate stability through a functional range of motion.

Nonoperative Treatment Principles

The contemporary treatment paradigm for simple elbow dislocations prioritizes concentric joint reduction followed by early, protected mobilization. Prolonged immobilization is historically associated with profound and recalcitrant elbow stiffness.

Immobilization: A posterior splint is applied with the elbow at 90 degrees of flexion.
Early Motion: Unprotected, active flexion and extension exercises should be initiated within 2 weeks of the dislocation.
Outcomes: High-quality evidence demonstrates that patients with unstable elbow joints treated nonoperatively (with early motion) often exhibit fewer long-term symptoms and better functional scores than those subjected to acute ligamentous repair. Late elbow instability and severe stiffness are exceedingly rare following appropriately managed simple dislocations.

Indications for Operative Intervention in Simple Dislocations

While nonoperative management is the gold standard, surgical intervention may be indicated in specific clinical scenarios:
* Incongruent Reduction: Any evidence of a non-concentric reduction (e.g., a "drop sign" on the lateral radiograph) indicates entrapped soft tissue or profound instability requiring surgical clearance and stabilization.
* High-Demand Athletes: Burra and Andrews, among other sports medicine authorities, recommend acute operative repair of the capsuloligamentous structures in elite throwing athletes. The extreme valgus extension overload experienced during the throwing motion demands absolute MCL integrity, which may not be reliably restored through nonoperative healing.

COMPLEX ELBOW INSTABILITY AND FRACTURE-DISLOCATIONS

Complex elbow dislocations involve severe damage to both the osseous architecture and the soft-tissue envelope. The presence of fracture fragments (e.g., radial head, coronoid process, or olecranon) can mechanically block closed reduction or render the joint grossly unstable even after reduction is achieved.

Dislocation of the Radial Head

Isolated dislocation of the radial head without an associated fracture of the ulna or dislocation of the ulnohumeral joint is an exceptionally rare entity in adults. When encountered, the surgeon must maintain a high index of suspicion for an occult ulnar fracture or a subtle plastic deformation of the ulna.

Monteggia Fracture-Dislocations

A dislocation of the radial head coupled with a fracture of the proximal third of the ulna constitutes a Monteggia fracture-dislocation. The fundamental principle of treating a Monteggia lesion is that the radial head will almost always reduce spontaneously—and remain stable—once the ulnar fracture is anatomically reduced and rigidly fixed with plate osteosynthesis. Failure to achieve absolute anatomic alignment of the ulna will result in persistent radial head subluxation or dislocation.

Surgical Warning: Never accept a non-concentric reduction of the radial head following ulnar fixation in a Monteggia fracture. If the radial head remains subluxated, the ulnar reduction is imperfect, or there is an interposition of the annular ligament or joint capsule requiring open exploration.

Severe Soft-Tissue Damage in Complex Dislocations

In complex fracture-dislocations (such as the "terrible triad" of the elbow: elbow dislocation, radial head fracture, and coronoid fracture), surgical intervention is mandatory to restore joint stability. The surgical algorithm typically proceeds from deep to superficial and from the "inside out":
1. Fixation or replacement of the radial head.
2. Fixation of the coronoid process (or repair of the anterior capsule).
3. Repair of the LUCL complex.
4. Repair of the MCL (if the elbow remains unstable after lateral and anterior reconstruction).

SURGICAL TECHNIQUE: ANNULAR LIGAMENT REPAIR AND RECONSTRUCTION

When the radial head is irreducible due to soft-tissue interposition, or when chronic radial head instability is present, open reduction and repair—or formal reconstruction—of the annular ligament is indicated. The following technique details the operative steps for addressing radial head instability.

Preoperative Planning and Positioning

Anesthesia: General anesthesia with or without a regional supraclavicular or axillary block.
Positioning: The patient is positioned supine with the operative arm draped free across the chest, or in the lateral decubitus position with the arm resting over a post. A sterile tourniquet is applied to the proximal arm.
Equipment: Small fragment set, suture anchors, fine non-absorbable sutures (e.g., No. 2-0 or 0 FiberWire), and a fascia lata harvesting kit if reconstruction is anticipated.

Step 1: Surgical Approach and Exposure

Make a longitudinal incision over the posterolateral aspect of the elbow, centered over the radial head.
Develop the Kocher interval between the anconeus (innervated by the radial nerve) and the extensor carpi ulnaris (innervated by the posterior interosseous nerve).
Elevate the supinator muscle off the proximal radius.
Identify the Annular Ligament: Carefully dissect to expose the radial head and identify the remnants of the torn annular ligament and lateral capsule.

Pitfall: The Posterior Interosseous Nerve (PIN) lies within the substance of the supinator muscle. To protect the PIN, keep the forearm fully pronated during the deep dissection, which moves the nerve anteriorly and away from the surgical field.

Step 2: Joint Debridement and Primary Repair

Irrigate the radiocapitellar joint and remove any osteochondral loose bodies or interposed capsular tissue that may be blocking reduction.
Reduce the radial head dislocation. Assess the stability of the reduction through a full range of pronation and supination.
If the native annular ligament and capsule are of sufficient quality, perform a direct primary repair using fine, interrupted, non-absorbable sutures.

Step 3: Graft Harvesting (If Primary Repair is Impossible)

If the annular ligament is irreparably damaged, attenuated, or deficient (often the case in delayed presentations), a formal reconstruction is required.
* Fascia Lata Graft: Prepare the lateral thigh. Harvest a strip of fascia lata measuring exactly 1.3 cm in width and 10 cm in length.
* Alternative Graft: Alternatively, a strip of deep fascia from the dorsal aspect of the forearm or a slip of the triceps tendon (Bell-Tawse technique) may be utilized to avoid a second surgical site.

Step 4: Ulnar Tunnel Preparation

Expose the posterior surface of the proximal ulna through a second, 5.0 cm long incision (or by extending the primary posterior incision).
Identify the sublime tubercle and the supinator crest.
Using a 3.2 mm or 4.5 mm drill bit, create a transverse osseous tunnel through the proximal ulna. The tunnel must be positioned exactly 1.3 cm distal to the articular level of the radial head to replicate the anatomic origin and insertion of the native annular ligament.

Step 5: Graft Passage and Fixation

Pass the harvested strip of fascia lata through the ulnar osseous tunnel.
Route the graft circumferentially around the radial neck. Ensure the graft sits smoothly in the anatomic sulcus of the radial neck without impinging on the radiocapitellar articulation.
With the forearm held in neutral rotation and the radial head concentrically reduced, suture the ends of the fascial graft together.
Tensioning: The graft must be sutured without excessive tension. Over-tensioning the reconstructed annular ligament will severely restrict forearm rotation and may lead to iatrogenic radiocapitellar arthritis. The goal is to act as a check-rein against subluxation, not to compress the radius against the ulna.

Step 6: Closure

Verify concentric reduction and smooth, unrestricted pronation and supination under direct visualization and fluoroscopy.
Close the fascial intervals, subcutaneous tissue, and skin in a standard layered fashion.
Apply a sterile dressing and a well-padded posterior splint.

POSTOPERATIVE CARE AND REHABILITATION

The postoperative rehabilitation protocol is critical to achieving a functional outcome. The elbow is notoriously prone to stiffness, and the balance between protecting the reconstruction and preventing arthrofibrosis is delicate.

Phase I: Immobilization (Weeks 0 to 3)

The arm is placed in a posterior splint or a custom orthoplast cast.
The elbow is immobilized at exactly 90 degrees of flexion.
The forearm is maintained in neutral rotation.
Immobilization is strictly maintained for 2 to 3 weeks to allow the fascial graft to incorporate and the capsular tissues to heal.

Phase II: Early Active Motion (Weeks 3 to 8)

At 2 to 3 weeks, the splint is removed, and a hinged elbow brace may be applied to protect against varus/valgus stress.
Gentle Active Motion: The patient is instructed to begin gentle, active, and active-assisted range of motion exercises.
Muscle Rehabilitation: Focus is placed on isometric strengthening of the biceps, triceps, and brachioradialis to provide dynamic stability to the joint.

Surgical Warning: The elbow must never be forcefully manipulated. Passive forced motion in an attempt to restore extension or flexion is strictly contraindicated. Aggressive passive stretching causes microtrauma to the healing capsule, inciting an inflammatory cascade that dramatically increases the risk of Heterotopic Ossification (HO) and permanent stiffness.

Phase III: Strengthening and Return to Function (Weeks 8+)

Wean from the hinged brace.
Progressive resistance exercises are incorporated.
Full functional recovery may take up to 6 to 12 months.

Expected Outcomes and Complications

Following annular ligament reconstruction and restoration of active motion and strength, the radial head may occasionally demonstrate slight radiographic displacement or subluxation. Clinical studies indicate that minor asymptomatic subluxation does not interfere significantly with long-term functional outcomes or patient satisfaction.

However, surgeons must monitor for potential complications, including:
* Posterior Interosseous Nerve (PIN) Palsy: Usually transient, resulting from traction during the lateral approach.
* Heterotopic Ossification: Prophylaxis (e.g., Indomethacin or single-fraction radiation) should be considered in high-risk patients with severe concomitant head trauma or massive soft-tissue injury.
* Loss of Terminal Extension: A loss of 10 to 15 degrees of terminal extension is common following complex elbow trauma and should be discussed with the patient preoperatively to manage expectations.

Authoritative Medical Review

This academic synthesis is based on established protocols from Hutaifortho's Operative Orthopaedics and has been medically reviewed by Prof. Dr. Mohammed Hutaif, Consultant Orthopedic & Spine Surgeon. It is designed to assist orthopedic residents, fellows, and practicing surgeons in surgical preparation and board reviews (AAOS, FRCS, Arab Board).

Clinical Disclaimer: The surgical techniques, indications, and medical guidance detailed herein are for advanced educational purposes only. They do not supersede institutional guidelines or independent surgical judgment.

📚 Medical References

Medically Verified Content

Prof. Dr. Mohammed Hutaif

Consultant Orthopedic & Spine Surgeon

Operative Management of Elbow Dislocations and Radial Head Instability