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) through the fibula and allowing slight fibular glide and rotation during ankle movement. Its cavity communicates with the knee joint, through the subpopliteal recess, in roughly 10 percent of people. The common peroneal nerve wraps around the fibular neck immediately below this joint.
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Proximal tibiofibular joint instability produces lateral knee pain and a palpable fibular head click, managed conservatively in most cases and by stabilisation or arthrodesis when persistent. Acute dislocation, most often anterolateral, follows violent twisting or high-energy knee injury and shows as a prominent fibular head; it may be mistaken for a fibular head fracture. Closed reduction with direct pressure usually succeeds, and peroneal nerve function must be checked. Ganglion cysts arising from this joint can track along the articular branch into the common peroneal nerve, causing progressive foot drop.
Fibular head instability producing lateral knee clicking and pain managed with conservative treatment or surgical stabilisation.
Displacement of the fibular head, usually anterolaterally, after a violent twisting injury, presenting as a prominent fibular head with possible peroneal nerve symptoms; treated by closed reduction.
Ganglion cyst from the joint compressing or entering the common peroneal nerve, producing progressive foot drop and lateral leg numbness.
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