The interosseous talocalcaneal ligament is a strong, broad band lying in the tarsal canal between the talus and calcaneus, separating the posterior subtalar joint from the talocalcaneonavicular joint. Together with the more lateral cervical ligament it occupies the sinus tarsi and is the main ligamentous stabiliser of the subtalar joint. Severe ankle inversion sprains can disrupt it along with the ATFL and CFL, contributing to sinus tarsi syndrome, a persistent lateral hindfoot pain from failed ligament healing and synovial scarring.
| Origin | Sulcus tali (floor of the sinus tarsi) |
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| Insertion | Sulcus calcanei (floor of the sinus tarsi) |
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Binds the talus to the calcaneus within the tarsal canal and stabilises the subtalar joint.
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, and arthroscopic sinus tarsi debridement is used for refractory cases. Complete rupture needs a severe mechanism and causes frank subtalar instability. Intra-articular calcaneal fractures crossing the posterior facet also disrupt this ligament.
Interosseous talocalcaneal ligament disruption producing persistent lateral hindfoot pain managed with injection and arthroscopic debridement.
Other versions of this entry: Interosseous Talocalcaneal Ligament Detail
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