Talus, Superior View

Description

Talus (astragalus) is presented from a superior perspective, bringing the trochlea tali into full view as it spans mediolaterally between the medial and lateral trochlear margins. Anteriorly, the trochlear surface tapers toward the neck of the talus, while posteriorly it widens toward the posterior process where the sulcus for the flexor hallucis longus tendon runs between the medial and lateral tubercles. Along the medial side, the comma-shaped facet for the medial malleolus sits adjacent to the body of the talus, with the lateral malleolar facet positioned more laterally and slightly posterior. Superolateral widening of the trochlea explains the ankle’s bony stability in dorsiflexion, when the broader anterior talar dome is wedged between the malleoli. Small changes in this contour matter. Talar dome osteochondral lesions, post-traumatic incongruity after ankle fracture, or varus tilt from lateral ligament insufficiency all concentrate load on the superior articular cartilage and can be correlated to the exact region of the trochlea shown here. Orthopaedic and podiatry educators can pair this view with mortise radiographs or CT-based teaching to clarify why plafond alignment and syndesmotic reduction determine contact pressures across the tibiotalar joint. It also reads well in anatomy and biomechanics course material covering the tarsus, gait, and weight-bearing through the ankle. Anatomical accuracy verified by SciePro's Medical Advisory Board.