Abstract
Os Trigonum is the consequence of a lack of fusion of the lateral tubercle of the posterior process of the talus with the body of the talus, or of a fracture of a partially or completely ossified centrum. Present in between 1.7% and 25% of the population, it was first described by Rosenmüller in 1804. Giant os trigonum is a rare entity, and its fracture and pseudoarthrosis are even rarer, which increases the possibility of causing painful symptoms, caused by the “nutcracker” effect. X-rays and magnetic resonance imaging are the diagnostic aids for characterizing this entity.
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