New posteromedial portal for ankle arthroscopy.

We describe a new posteromedial portal through the bed of the posterior tibial tendon. It can be made easily with a 0.5-inch posteromedial skin incision along the course of the posterior tibial tendon just behind the posterior colliculus of the medial malleolus. After the flexor retinaculum is incised and the posterior tibial tendon is retracted anteriorly, a small bulging area of capsule can be seen as a result of saline inflation. The new posteromedial portal can then be made easily through this inflated capsule. This portal allows good access to the posterior joint surface and has a minimal risk of injury to the medial neurovascular bundle.