The sinus tarsi contains three distinct ligamentous structures: the cervical ligament, the interosseous talocalcaneal ligament, and the medial root of the inferior extensor retinaculum — all contributing to subtalar stability within the sinus tarsi.
Provide the primary subtalar joint intrinsic stability via the cervical and interosseous components, resist excessive subtalar inversion and eversion, and maintain sinus tarsi patency.
Sinus tarsi syndrome involves disruption or inflammation of all three sinus tarsi ligamentous structures after inversion ankle injury. MRI demonstrates sinus tarsi fluid and ligament signal changes. Injection and arthroscopic debridement address the syndrome.
Inversion injury disrupting the sinus tarsi ligaments producing persistent lateral ankle and sinus tarsi pain, managed by injection and arthroscopic debridement.
Disruption of the cervical and interosseous ligaments producing subtalar instability with excessive hindfoot inversion, reconstructed using a peroneal or extensor retinaculum graft.
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