[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

THE SUBTALAR JOINT The subtalar joint, between the talus and the calcaneus, contributes to the complex motions of pronation and supination. These action In addition, the subtalar joint has the largest surface area of all the joints in the foot. Without the subtalar joint, you would be unable to run, jump, walk, or move with any precision. It is often the site of sprains, dislocation, and fractures, and can also be directly affected by rheumatoid arthritis or osteoarthritis. Two important actions

Subtalar Fusion

Subtalar Arthritis

Subtalar Arthrodesis for Post-Traumatic Subtalar Arthritis | Journal of Medical Insight