Calcaneal Sustentaculum Tali, Superior View

Description

Calcaneus anatomy dominates this superior view, with the sustentaculum tali projecting medially like a bony shelf from the body of the heel bone. The smooth articular surface on its superior aspect corresponds to the middle talar facet, positioned medial to the posterior subtalar facet and separated from it by the calcaneal sulcus that contributes to the sinus tarsi. Anterior to the sustentaculum, the superior surface continues toward the region of the anterior talar and calcaneocuboid articulations, while the medial border frames the area where the flexor hallucis longus tendon runs in a groove on the plantar surface (not fully visible from above). Orientation is fixed and unambiguous. Subtalar joint mechanics become easier to teach when the middle facet is isolated from surrounding contours, because this is the load-sharing contact point that transmits forces from the talus into the calcaneus during stance and heel rise. Fracture lines from intra-articular calcaneal fractures often extend toward the sustentaculum, and surgeons frequently reference the sustentacular fragment as a relatively stable landmark during open reduction and internal fixation. Arthritis, tarsal coalition, and malalignment can all alter congruence at the middle facet. A small surface, big consequences. Use this illustration in musculoskeletal anatomy courses, podiatry and orthopedic teaching files, and surgical texts discussing subtalar arthrodesis, calcaneal fracture classification, or spring ligament related adult acquired flatfoot. It also fits exam questions that ask learners to identify the sustentaculum tali and relate it to the middle talar facet in a superior (dorsal) orientation. Anatomical accuracy verified by SciePro's Medical Advisory Board.