Wrightington (Extended Lateral) Approach to the Elbow

What it exposes. The Wrightington extended lateral approach is an extensile lateral exposure of the distal humerus that elevates the common extensor origin from the lateral supracondylar ridge and extends the Kocher interval (ECU-anconeus) distally. This converts a limited lateral window into a broad exposure of the capitellum, the lateral trochlea, the anterior distal humeral cortex and the radiocapitellar joint, all without detaching the triceps mechanism or transposing the ulnar nerve. Why this approach is chosen. The capitellum and the anterolateral distal humerus are difficult to expose through a single standard approach. A simple Kocher gives only the radial head and radiocapitellar joint. By elevating the common extensor origin and extending Kocher proximally, the Wrightington approach gives direct articular visualisation that a plain Kocher cannot, while avoiding the morbidity of an olecranon osteotomy when lateral access is all that is required. ### Indications - Capitellar fractures, especially complex coronal shear fractures and those with trochlear extension (Dubberley type B)

• Lateral column fractures of the distal humerus
• Bicolumnar distal humeral fractures where the lateral column is addressed through this approach (often combined with a medial approach)
• Distal humeral non-union or malunion requiring lateral access and bone stock visualisation
• Selected total elbow arthroplasty where lateral column access or a combined extensile route is needed
• Lateral soft-tissue and bony procedures on the radiocapitellar joint, including radial head ORIF through the distal Kocher component ### Contraindications - Pathology that is purely medial (use a medial approach with ulnar nerve management)
• Severe soft-tissue compromise or active infection over the lateral elbow
• Open physes in the skeletally immature (relative - take care around the lateral epicondylar apophysis)
• A bicolumnar intra-articular fracture in which an olecranon osteotomy is judged to give superior global articular visualisation ### Alternative Approaches The extended lateral approach sits between a limited lateral (Kocher) window and a posterior extensile (olecranon osteotomy) exposure:

Other options include the anterior (Henry) approach for anterior neurovascular structures, the medial approach for the medial column, coronoid and ulnar nerve transposition, and the olecranon osteotomy - the gold-standard extensile exposure for bicolumnar intra-articular distal humeral fractures, at the cost of osteotomy-site morbidity. ### Position & Landmarks Position: supine, with the arm draped free across the chest. A sandbag or bump under the ipsilateral scapula brings the elbow forward. The elbow is flexed and the forearm brought across the chest, supported by a folded sheet or a sterile arm support, so the assistant can pronate and supinate on command - pronation protects the PIN. A pneumatic tourniquet sits on the well-padded upper arm, and an image intensifier is available from the ipsilateral side if intra-operative imaging is anticipated. Surface landmarks to mark before incision: - Lateral epicondyle - the common extensor origin and the isometric origin of the LCL complex (the centre of elbow rotation)

• Lateral supracondylar ridge - the ridge along which the approach extends proximally
• Olecranon tip - posterior reference
• Radial head - palpable, rotates with pronation and supination; defines the radiocapitellar joint
• Kocher interval - the palpable soft spot just posterior to the radial head, between ECU and anconeus The incision is a curved line centred over the lateral epicondyle, beginning about 4 to 5 cm proximal to the epicondyle along the lateral supracondylar ridge and curving distally and posteriorly toward the Kocher interval between the radial head and the olecranon, 8 to 12 cm in total depending on the exposure required.

Pre-operative Assessment

Neurovascular (critical baseline): document pinch and finger extension (PIN function) and wrist and finger extension against resistance (radial nerve) pre-operatively; check distal pulses and capillary return, and sensation in the first web space (PIN) and the posterolateral forearm (radial sensory and posterior antebrachial cutaneous). Soft tissue: assess swelling, abrasions and blistering and apply the wrinkle test over the lateral elbow; exclude an open wound and check elbow stability and range of motion gently. High-energy injuries with blisters or a negative wrinkle test may need staging or a spanning external fixation while awaiting definitive fixation. ### Investigations Plain radiographs (initial): AP and lateral elbow for overall alignment and gross pattern, oblique views to define the capitellum and lateral column, and a radiocapitellar (Greenspan) view to profile the capitellum and radial head. CT is essential for any articular distal humeral fracture being considered for surgery - axial, coronal and sagittal reconstructions with 3D rendering define the size and displacement of the capitellar fragment, trochlear extension and any posterior column component (Dubberley B), which decide whether an extended lateral approach is sufficient or a second approach is needed.

Work down through the layers over the lateral epicondyle: protect the posterior antebrachial cutaneous nerve superficially, develop the ECU-anconeus (Kocher) interval distally, then elevate the common extensor origin off the ridge proximally to deliver the capitellum and lateral trochlea - all with the forearm pronated and the LCL complex preserved. ### Anatomy The distal humerus is formed by two columns (medial and lateral) joined to the trochlea and capitellum. The lateral column ends distally in the capitellum, a hemispherical articular surface articulating with the radial head that faces anteriorly and inferiorly and is almost entirely covered by cartilage - so its blood supply enters posteriorly through the non-articular surface, and excessive posterior stripping risks avascular necrosis. The lateral epicondyle is the common extensor origin and the origin of the lateral collateral ligament complex. | Layer | Muscle | Nerve supply | Role in the approach | |-------|--------|--------------|----------------------| | Superficial | Brachioradialis, ECRL | Radial nerve | Elevated anteriorly off the ridge | | Superficial | ECRB | Radial nerve (PIN) | Part of the common extensor mass elevated | | Deep (interval) | Extensor carpi ulnaris (ECU) | Posterior interosseous nerve | Anterior boundary of the Kocher interval | | Deep (interval) | Anconeus | Radial nerve | Posterior boundary of the Kocher interval | | Deep | Supinator | Posterior interosseous nerve | Houses the PIN - pronation moves the nerve off it | | Posterior | Triceps | Radial nerve | Preserved and retracted, not detached | ### Internervous Plane The deep internervous plane is between extensor carpi ulnaris (ECU), supplied by the posterior interosseous nerve, anteriorly; and the anconeus, supplied by the radial nerve, posteriorly. This is the Kocher interval, extended proximally by elevating the common extensor origin from the lateral supracondylar ridge. Above the joint the approach is not a true internervous plane - it is a muscle-elevating (subperiosteal) dissection in which the common extensor origin (ECRB, ECU) together with brachioradialis and ECRL is stripped off the ridge and reflected anteriorly, with the radial nerve setting the proximal limit.

Structures at risk, by layer

Extensile Options

Proximal extension: the incision and deep dissection extend along the lateral supracondylar ridge toward the distal arm to expose more of the distal humeral shaft and lateral column; the limit is the radial nerve, which pierces the lateral intermuscular septum roughly 10 cm proximal to the lateral epicondyle - identify and protect it before extending further. Distal extension: the approach continues as the Kocher approach to expose the radial head, radial neck and proximal radius - useful when a capitellar fracture coexists with a radial head fracture requiring fixation. The PIN remains at risk throughout the supinator, so maintain pronation. Combination with a medial approach: for bicolumnar patterns needing medial access, a separate medial approach (with ulnar nerve management) can be added, avoiding skin bridges that compromise vascularity. When an olecranon osteotomy is preferred instead: global bicolumnar intra-articular comminution, or where posterior articular visualisation is the priority. The extended lateral approach is then reserved for the lateral column or selected arthroplasty cases. ### Closure and LCL Repair The non-negotiable step of closure is repair of the LCL complex to the isometric point on the lateral epicondyle (via the bone fleck, transosseous tunnels or suture anchors), followed by reattachment of the common extensor origin and brachioradialis to the ridge, copious irrigation, haemostasis, a drain as needed, and layered closure with a splint in 90 degrees of flexion. ### Complications Intra-operative complications | Complication | Prevention | Management | |--------------|------------|------------| | PIN injury | Pronation, stay on bone, no blind retraction | Document, splint the wrist in extension, EMG at 3 weeks, explore if no recovery | | LCL deficiency / PLRI | Preserve on a bone fleck; mandatory repair to isometric point | Acute repair; reconstruction for chronic PLRI | | Radial nerve injury (proximal) | Identify the nerve before extending proximally | Primary repair if transected | | Intra-articular hardware | Confirm screw length under fluoroscopy and direct vision | Remove and replace with a shorter screw | | Capitellar AVN | Preserve posterior soft-tissue attachments | Observe; reconstruct if collapse occurs | Post-operative complications | Complication | Typical incidence | Prevention | Treatment | |--------------|-------------------|------------|-----------| | Posterolateral rotatory instability | Variable | Meticulous LCL/LUCL repair | Reconstruction (tendon reconstruction of the LUCL) | | Heterotopic ossification | Variable in high-energy injury | Gentle handling; prophylaxis in high-risk patients | Excision if functionally limiting and mature | | Infection | Low with healthy soft tissues | Antibiotics, meticulous closure | Debridement and antibiotics | | Stiffness / loss of motion | Common | Early controlled mobilisation | Physiotherapy; arthrolysis if refractory | | Post-traumatic arthritis | Depends on reduction quality | Anatomic articular reduction (step-off less than 2 mm) | Analgesia; arthroplasty if severe | PIN injury management: if the nerve is identified as transected intra-operatively, plan primary repair or grafting; if a neurapraxia is suspected post-operatively, document the deficit, splint the wrist in extension and arrange electromyography at 3 weeks; if there is no clinical or electrical recovery by about 3 months, consider nerve exploration. ### Outcomes Good prognostic factors: anatomic articular reduction (step-off less than 2 mm), a simple capitellar pattern without posterior column extension (Dubberley A), stable fixation allowing early mobilisation, and an intact LCL complex. Poor prognostic factors: an associated posterior column fragment (Dubberley B), comminution or a thin Kocher-Lorenz shell, a high-energy mechanism with soft-tissue injury, and delayed mobilisation from instability.

• Capitellar and coronal shear fractures - the principal indication; fixed with countersunk headless compression screws
• Radial head ORIF - through the distal Kocher component, when a capitellar fracture coexists with a radial head fracture
• Lateral column distal humeral fractures - lateral column plating
• Bicolumnar distal humeral fractures - the lateral column addressed here, combined with a medial approach
• Distal humeral non-union and malunion - lateral access and bone stock visualisation
• Selected total elbow arthroplasty - lateral column exposure in combined extensile strategies
• Lateral soft-tissue and radiocapitellar procedures ### Capitellar Fracture Patterns (Bryan and Morrey) - Type I (Hahn-Steinthal): complete fracture of the capitellum
• Type II (Kocher-Lorenz): anterior shell with minimal osseous attachment
• Type III: comminuted capitellar fracture
• Complex coronal shear variants extend into the trochlea and demand an extended lateral exposure ### Dubberley Classification (Capitellar and Trochlear) The Dubberley system drives approach selection - a posterior column fragment (B) worsens prognosis and may demand an added approach.

Fixation Principles and Fix Versus Arthroplasty

ORIF is preferred in physiologically young, active patients with reconstructable articular fragments; total elbow arthroplasty is considered in elderly, low-demand patients with unreconstructable comminution or pre-existing inflammatory arthritis, where the extended lateral approach can contribute the lateral column exposure in selected strategies. The fixation principles are anatomic articular reduction (step-off less than 2 mm), subchondral countersunk headless compression screws for capitellar fragments, lateral column plating for columnar fractures, restoration of the LCL complex to avoid posterolateral rotatory instability, and bone graft for any metaphyseal void.

Guidelines, Registries & Global Practice

Lateral approaches to the elbow are used worldwide, and the operative principles are convergent across examination systems. Two principles recur in every modern description: protect the posterior interosseous nerve by pronating the forearm, and preserve or repair the lateral collateral ligament complex to prevent posterolateral rotatory instability. Side-by-side principles (where guidance converges): | Body | Position on lateral elbow approaches | |------|--------------------------------------| | AO Foundation | CT mandatory for articular distal humeral fractures; lateral column addressed through a lateral approach with the PIN protected by pronation; anatomic articular restoration is the goal | | AAOS / OTA | Anatomic articular reduction and stable fixation as primary goals; recognise that many capitellar fractures are complex articular injuries with trochlear extension | | BOA / BOAST | Soft-tissue assessment and timing matter; photographic documentation for open injuries; definitive fixation once soft tissues permit | Global practice variation: in high-resource settings, pre-contoured lateral column plates, headless compression screws and suture anchors for LCL repair are standard, and CT guides every articular case; in resource-limited settings the same principles are applied with small-fragment reconstruction plates and transosseous sutures for the LCL. The extended lateral approach is universally valued where lateral column access suffices, while olecranon osteotomy remains the global standard for bicolumnar intra-articular comminution. Consent (globally applicable): discuss posterior interosseous nerve injury (prevented by pronation), posterolateral rotatory instability (prevented by LCL repair), infection, stiffness, heterotopic ossification, and the possibility of post-traumatic arthritis or later arthroplasty if the articular surface is severely damaged.