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Bilateral Os Trigonum Syndrome Associated with Bilateral Tenosynovitis of the Flexor Hallucis Longus Muscle

Pain located in the posterior ankle region is a common complaint in athletes who perform activities with the ankle in the equinus position, such as swimming, diving, figure skating, gymnastics, soccer playing, and dancing. Os trigonum syndrome and flexor hallucis tendinitis are among the common causes of posterior ankle pain.2,6 Symptoms that are caused by some pathologic conditions of the posterolateral process of the talus are known as the os trigonum syndrome. Synonymous terms are symptomatic os trigonum, talar compression syndrome, posterior ankle impingement syndrome, posterior ankle block, posterior tibiotalar impingement syndrome, posterior impingement. Flexor hallucis longus tenosynovitis may coexist with the os trigonum syndrome.1,2,5,6,7 Bilateral os trigonum syndrome is not seen frequently. Moreover, bilateral os trigonum syndrome and bilateral flexor hallucis longus tenosynovitis are very rare.1,4 We report a case of bilateral os trigonum syndrome and bilateral tenosynovitis of flexor hallucis longus muscle in a middle-aged teacher.