The fibulocalcaneal retinaculum is the inferior component of the inferior peroneal retinaculum, running from the lateral calcaneus to the fibula and reinforcing the peroneal tunnel at its distal extent. It holds the peroneal tendons against the lateral calcaneus as they turn beneath the lateral malleolus.
Retains the peroneal tendons against the lateral calcaneal surface, preventing bowstringing during eversion.
The fibulocalcaneal retinaculum is disrupted in peroneal tendon subluxation and in calcaneal fractures that involve the lateral wall. Its insufficiency allows the peroneal tendons to dislocate anteriorly over the lateral malleolus. Reconstruction during peroneal tendon stabilisation surgery includes repair or tightening of this retinacular component. It is distinct from the superior peroneal retinaculum which holds the tendons in the fibular groove.
Fibulocalcaneal retinaculum disruption allowing peroneal tendon displacement at the calcaneal level, producing lateral ankle pain and a palpable tendon snap with ankle eversion.
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