Ankle – Posteromedial Approach

Modern Study Review (AI-Generated)

High-Yield Summary

The posteromedial approach to the ankle provides direct access to the posterior ankle joint, distal tibia, and medial malleolus. It is primarily indicated for open reduction and internal fixation of posterior malleolar fractures, tendon repairs, and neurovascular decompression. Although it lacks a classic internervous plane, this approach remains a reliable corridor for open procedures but is increasingly supplemented or replaced by minimally invasive and arthroscopic techniques in select cases.

Applied Anatomy & Intervals

Internervous Interval

• No true internervous plane; dissection occurs between tendons and neurovascular structures.

Anatomic Landmarks

• Medial malleolus (palpable bony prominence)
• Achilles tendon (posterior landmark)
• Flexor hallucis longus (FHL) tendon
• Flexor digitorum longus (FDL) tendon
• Posterior tibial artery (PTA) and tibial nerve lie between FDL and FHL tendons

Patient Positioning & Setup

• Table Type: Standard operating table with radiolucent surface for fluoroscopy
• Patient Position:
• Supine with hip flexed and externally rotated, knee flexed (facilitates medial access)
• Alternatively, lateral decubitus with affected leg down for posterior access
• Specialized Equipment:
• Limb positioners or bump under ipsilateral hip to maintain external rotation
• C-arm positioned for lateral and AP ankle imaging

Surgical Technique (The “Vital Steps”)

Incision & Superficial Dissection

• Longitudinal incision midway between the medial malleolus and Achilles tendon, extending proximally and distally as needed
• Incise skin and subcutaneous tissue carefully to expose the fascia overlying the flexor tendons

Deep Dissection & Exposure

• Identify and isolate the flexor hallucis longus (FHL) tendon first
• Develop the plane between FHL and peroneal tendons (first option) or between the neurovascular bundle and flexor digitorum longus (FDL) tendon (second option)
• Retract the neurovascular bundle laterally with the FHL tendon to protect it
• Incise the posterior ankle capsule to expose the joint for fracture fixation or other procedures

The “Danger Zone”

Post-Operative Pearl

Early mobilization is encouraged, but avoid aggressive dorsiflexion or inversion stresses to protect the repaired capsule and neurovascular structures. Weight-bearing protocols depend on the underlying pathology and fixation stability.

Classic Clinical Notes

Ankle – posteromedial approach

• Position:
• Supine with hip flexed & externally rotated and knee flexed
• Lateral with affected leg down

• Incision:
• Long incision midway between Achilles tendon & medial malleolus

• Internervous Plane:
• No internervous plane

• Dissection:
• Deepen incision to enter fat that lies between Achilles & flexor tendons
• Identify fascia in anterior flap that covers flexor tendons

First option:

• Identify FHL
• Develop plane between FHL & peroneal tendons
• Expose ankle joint & incise capsule

Second option:

• Identify FHL
• Continue dissection anteriorly toward medial malleolus
• Identify neurovascular bundle & retract laterally with FHL
• Develop plane between neurovascular bundle & FDL
• Expose ankle & incise capsule

• Dangers:
• Posterior tibial artery & tibial nerve run between FDL & FHL with artery anterior to nerve

Last Updated on January 25, 2026 by orthonet