The interosseous talocalcaneal ligament runs within the tarsal canal (medial extension of the sinus tarsi), connecting the talar sulcus to the calcaneal sulcus. It is the deepest and most central subtalar stabiliser.
Acts as the axis of subtalar rotation, resisting excessive inversion and internal rotation of the calcaneus, and providing the central ligamentous anchor that prevents subtalar dislocation.
The interosseous talocalcaneal ligament is the last structure to fail in subtalar dislocations — its rupture allows complete separation of the talus from the calcaneus. In calcaneal fractures involving the sinus tarsi, this ligament may be disrupted, contributing to post-traumatic subtalar stiffness.
Complete interosseous talocalcaneal ligament failure allowing total subtalar joint separation, requiring urgent anatomic reduction and stabilisation.
Scar formation within the interosseous talocalcaneal ligament after calcaneal fracture producing subtalar joint stiffness, addressed by subtalar arthroscopic debridement or fusion in refractory cases.
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