[Coalition 14] Posterior Subtalar Joint Coalition: Rare but Important for Radiologists Isolated posterior subtalar joint coalitions are uncommon compared with the classic middle facet type. Anatomy & morphology Typically cartilaginous in nature. Involves the postero-medial portion of the posterior facet. May show bony overgrowth protruding into the tarsal tunnel. A superiorly directed spur from the posterior calcaneal facet can create a “humpback-type deformity.” Imaging findings Radiographs: of

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