The interosseous talocalcaneal ligament fills the sinus tarsi between the talus and calcaneus, providing the primary intraosseous restraint of the subtalar joint. Severe ankle inversion sprains can disrupt this ligament along with the ATFL and CFL, producing sinus tarsi syndrome — a persistent lateral hindfoot pain from failed ligament healing and synovial scarring in the sinus tarsi.
| Origin | Sulcus tali (floor of the sinus tarsi) |
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| Insertion | Sulcus calcanei (floor of the sinus tarsi) |
| Actions | Primary subtalar joint stabiliser occupying the sinus tarsi; resists excessive subtalar inversion and eversion |
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Sinus tarsi syndrome from interosseous talocalcaneal ligament disruption produces lateral hindfoot pain at the sinus tarsi opening (just anterior to the lateral malleolus), reproduced by direct pressure. MRI shows sinus tarsi fluid and ligament signal abnormality. Sinus tarsi injection provides diagnostic confirmation and therapeutic relief. Arthroscopic sinus tarsi debridement for refractory cases.
Interosseous talocalcaneal ligament disruption producing persistent lateral hindfoot pain managed with injection and arthroscopic debridement.
