Anterolateral / Direct Lateral Approach to the Distal Tibia (Pilon)

What it exposes. The anterolateral (direct lateral) approach to the distal tibia is an extensile approach used for open reduction and internal fixation of pilon (tibial plafond) fractures. A single curvilinear incision made in line with the fourth ray exposes the anterolateral distal tibia, the anterior ankle capsule, and the Chaput (Tillaux-Chaput) tubercle, while keeping the frail anteromedial skin of the distal tibia out of the surgical wound. It is the workhorse approach for anterolateral and central plafond impaction injuries and for anterolateral plating. Why this approach matters. Pilon fractures are high-energy intra-articular injuries of the weight-bearing plafond. The articular surface must be reconstructed anatomically and the distal tibial column stabilised, but the thin anteromedial soft-tissue envelope makes a single-stage anterior exposure hazardous. The anterolateral route capitalises on the better-vascularised lateral skin (supplied by perforators from the anterior and peroneal systems), gives access to the anterolateral articular block that is the key to reduction, and accepts a contoured anterolateral plate that acts as a buttress on the tension side — biomechanically favourable because anterolateral plating sits on the tension side of the distal tibia. Indications - Pilon fractures (AO/OTA 43-B and 43-C) requiring ORIF, especially anterolateral and central split-depression patterns

• Anterolateral plating of the distal tibia
• Reduction of the anterolateral (Chaput) fragment, which carries the anterior inferior tibiofibular ligament
• Selected Tillaux and transitional fractures in adults
• Anterior ankle arthrotomy, debridement, or arthrodesis Contraindications (mostly relative — stage the surgery) - Compromised anterolateral soft-tissue envelope with fracture blisters or closed degloving
• Contaminated open wounds over the planned incision (consider external fixation)
• Non-displaced or low-energy fractures amenable to non-operative care
• A medial-based primary fracture line better served by an anteromedial approach

Alternative and complementary approaches. The anteromedial approach is the classic direct route to the medial plafond but risks the thin anteromedial flap. The posterolateral and posteromedial approaches serve posterior and posteromedial column fragments respectively, and minimally invasive percutaneous plating suits low-energy patterns or poor soft tissues. The internervous plane. The safe dissection plane lies between two compartments supplied by different nerves: the anterior (extensor) compartment supplied by the deep peroneal nerve, and the lateral (peroneal) compartment supplied by the superficial peroneal nerve. To reach bone, the dissection is carried in the interval lateral to the tibialis anterior tendon, and the entire extensor compartment — together with the anterior neurovascular bundle (anterior tibial artery and deep peroneal nerve) — is elevated subperiosteally and retracted medially off the distal tibia.

Position & landmarks. The patient is supine on a radiolucent table, with a sandbag or bolster under the ipsilateral hip to roll the limb into slight external rotation and bring the anterolateral distal tibia into the operative field; a small bump under the distal leg improves lateral fluoroscopic views. The entire limb, including the hip, is prepped and draped so the limb can be manoeuvred and traction applied. A thigh tourniquet is used, with gentle or omitted exsanguination in severe soft-tissue injury. Before draping, confirm the C-arm arcs freely from the contralateral side for AP, mortise and lateral images, and document a baseline neurovascular examination including superficial and deep peroneal nerve function. Palpable landmarks are the tibial crest / anterior tibial border (medial boundary), the lateral malleolus (distal reference towards which the incision trends), the Chaput tubercle (anterolateral distal tibial prominence, just proximal to the joint line), and the fourth metatarsal ray (the distal continuation of the incision line). Soft-tissue landmarks are the tibialis anterior tendon (the tendon the incision stays lateral to), extensor digitorum longus and peroneus tertius (lateral to TA, forming the floor of the interval), and the dorsal foot veins with superficial peroneal nerve branches in the subcutaneous layer.

Work from lateral to medial through the layers, protecting the superficial peroneal nerve and elevating the entire extensor compartment — with the anterior neurovascular bundle — medially off the distal tibia, to deliver direct, in-line access to the anterolateral plafond and the Chaput fragment.

Structures at risk, by layer

Extensile options. The incision can be extended proximally along the anterolateral border of the tibia in line with the tibial crest for fractures extending into the metaphysis or diaphysis requiring a longer anterolateral plate. Distally it can be carried towards the sinus tarsi and the base of the fourth ray, giving access to the anterolateral ankle, the subtalar joint and the calcaneocuboid region for combined ankle and hindfoot procedures — though the superficial peroneal nerve becomes increasingly tethered distally, demanding careful handling.

Closure. Irrigate copiously and achieve meticulous haemostasis. Close the deep fascia and extensor retinaculum where possible with absorbable suture — but do not force a tight fascial closure in swollen tissue. Approximate the subcutaneous layer carefully to obliterate dead space, close the skin with non-absorbable monofilament sutures or staples without tension, and apply a well-padded splint with the ankle in neutral. Consider an incisional negative-pressure dressing in high-risk soft-tissue envelopes, and delay suture removal until the wound has healed, often 2 to 3 weeks.

• Pilon fracture ORIF — reduction and anterolateral plating of the plafond
• Reduction of the Chaput (Tillaux-Chaput) fragment and restoration of the syndesmosis
• Anterolateral / anterior distal tibial plating on the tension side
• Elevation of impacted articular fragments with metaphyseal bone grafting
• Anterior ankle arthrotomy, loose-body removal, or debridement
• Anterior / anterolateral ankle arthrodesis in post-traumatic arthritis
• ORIF of adult Tillaux and selected transitional distal tibial fractures Staged, soft-tissue-respecting management. High-energy pilon fractures are managed in two stages to protect the soft-tissue envelope. - Stage 1 (acute, day 0 to 2): spanning external fixation across the ankle with restoration of length and alignment, and fibular plating if the fibula is fractured. This re-establishes the soft-tissue envelope, maintains length through ligamentotaxis, and buys time. Staging markedly reduces deep wound complications compared with single-stage management.
• Stage 2 (definitive, day 10 to 21): once the wrinkle sign is positive, fracture blisters have re-epithelialised, and swelling has subsided, definitive ORIF is performed through the anterolateral approach. A CT after the spanning frame (and before definitive fixation) is used to plan fragment-specific reduction and fixation.

Reduction and fixation sequence. (1) Restore fibular length and alignment, often at Stage 1. (2) Reconstruct the articular surface, using the Chaput fragment and the medial malleolus as references and elevating impacted central fragments. (3) Bone graft the metaphyseal void. (4) Apply a contoured anterolateral buttress plate with screws supporting the reconstructed articular block. (5) Confirm reduction and hardware on AP, mortise and lateral fluoroscopy, aiming for an articular step-off of less than 2 mm.

Guidelines, Registries & Global Practice Pilon fractures are high-energy intra-articular injuries managed at trauma centres worldwide. Across examination systems, practice converges on CT-based pre-operative planning, soft-tissue-respecting staged management, anatomic articular reconstruction, and column-specific plating. The anterolateral approach is favoured for anterolateral and central plafond patterns because it accesses the Chaput fragment directly and accepts a biomechanically favourable tension-side plate. Side-by-side principles (where guidance converges) | Body | Position on pilon fractures |

|------|------------------------------| | AO Foundation | CT mandatory for articular fractures; staged management with spanning external fixation for high-energy injuries with soft-tissue compromise; column/fragment-specific fixation and buttress plating | | BOA / BOAST (open and soft-tissue) | Early soft-tissue assessment and photographic documentation; joint orthoplastic care for open injuries; definitive fixation only once soft tissues permit | | OTA / AAOS | Anatomic articular reduction and restoration of length, alignment and rotation as primary goals; CT-based planning as standard of care | Global practice variation. In high-resource settings, pre-contoured periarticular plates, dedicated anterolateral pilon plates and routine CT are standard, and incisional negative-pressure dressings are widely used. In resource-limited settings, the same biomechanical principles are achieved with spanning or definitive external fixation and with contoured small-fragment plates, and external fixation carries a larger role in definitive management. Consent (globally applicable): discuss wound breakdown and deep infection (the dominant complications, reduced but not abolished by staging), superficial and deep peroneal nerve injury, stiffness, post-traumatic arthritis, and the possible need for future ankle arthrodesis if the articular damage is severe.