The proximal tibiofibular joint is a small plane synovial joint between the fibular head and the posterolateral tibial condyle, transmitting forces from the lateral knee structures (LCL, biceps femoris, IT band) through the fibula to the ankle. The common peroneal nerve wraps around the fibular neck immediately below this joint.
Proximal tibiofibular joint instability produces lateral knee pain and a palpable fibular head click, managed conservatively in most cases. The joint is occasionally explored during total knee replacement as a source of residual lateral knee pain. It may be arthrodesed for persistent painful instability.
Fibular head instability producing lateral knee clicking and pain managed with conservative treatment or surgical stabilisation.
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