Calcaneocuboid capsuloligamentous soft-tissue entrapment: a rare cause of acquired equinovarus deformity.

Acquired equinovarus deformity is rare, with most cases related to congenital disorders such as clubfoot. We describe a unique case of traumatic capsuloligamentous soft-tissue entrapment within the calcaneocuboid joint in a 13-year-old girl, causing an acquired equinovarus deformity. This required surgical exploration and joint fixation. Assessing soft-tissue entrapment on magnetic resonance imaging can be beneficial as a potential cause of an acquired post-traumatic non-reducible foot deformity in children. We discuss the intricate capsuloligamentous structures that reinforce the calcaneocuboid joint and highlight the importance of interrogating such structures in the context of inversion injuries to the ankle.