The interosseous talocalcaneal ligament is the short but strong ligament filling the posterior tarsal canal, connecting the inferior talar sulcus to the superior calcaneal sulcus. Together with the cervical ligament, it forms the primary subtalar joint stabilising complex.
Acts as the rotational axis of the subtalar joint, resisting excessive calcaneal inversion and internal rotation under the talus, and providing the central ligamentous anchor preventing subtalar dislocation.
Interosseous ligament tears in severe ankle inversion injuries produce subtalar instability that may be underdiagnosed. Sinus tarsi injection into the interosseous ligament zone is both diagnostic and therapeutic in sinus tarsi syndrome.
Severe inversion injury tearing the interosseous ligament producing subtalar instability and sinus tarsi syndrome, managed by physiotherapy or sinus tarsi arthroscopic debridement for persistent symptoms.
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