Basic anatomy of Subtalar Joint and Foot The subtalar joint (talocalcaneal joint) is vital for hindfoot stability and mobility. Posterior facet: largest, best seen on lateral radiographs and CT Middle facet: on the sustentaculum tali, may communicate with the talonavicular joint Anterior facet: smallest, may merge with the middle facet Imaging pearls: Sustentaculum tali appears brick-shaped on lateral X-ray Anterior calcaneal process should not articulate with the navicular—if it does, think coa

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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