Distal tibiofibular synchondrosis
Ankle pain for several months.
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Tibial exostosis indenting the distal fibula and forming a synchondrotic junction instead of the normal syndesmosis. Secondary osteoarthitis with bone marrow edema.
This condition is supposed to arise from one or more osteochondromas at the level of the syndesmosis, similar to tibiofibular synostosis.