Sinus tarsi syndrome
Basketball player with ankle and subtalar pain. ?talar dome abnormality.
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Scarring and oedema within the sinus tarsi with poorly defined sinus tarsi ligaments (cervical ligament and interosseous talocalcaneal ligament) and inferior extensor retinaculum. Synovitis of the posterior subtalar joint. Os trignonum with preserved marrow signal and only low grade adjacent synovitis making symptomatic posterior ankle impingement unlikely. There are features of anterolateral ankle impingement with bony spurring and localised synovitis. Mild scarring of the medial and lateral ankle ligaments without complete tear.
Features of sinus tarsi syndrome / subtalar joint instability with the normal sinus tarsi fat replaced with oedema and scarring. The sinus tarsi ligaments and inferior extensor retinaculum are poorly defined consistent with previous injury and chronic subtalar instability. There is also evidence of anterolateral ankle impingement.