Talus, Posterior View

Description

Oriented in posterior view, the talus (astragalus) is presented with emphasis on the posterior process and its medial and lateral tubercles flanking the posterior groove for the flexor hallucis longus tendon. Superiorly, the trochlea tali forms the ankle mortise surface for the tibial plafond, while the posterior margin drops into the hindfoot toward the calcaneal articular facets on the inferior aspect. Medially the talar body narrows toward the tarsal canal and sulcus tali, and laterally it expands toward the fibular malleolar surface and the sinus tarsi. Small bone. Big consequences. Posterior talar anatomy matters because this is where os trigonum variants, enlarged posterior tubercles (Stieda process), and posterior ankle impingement live clinically, often in ballet dancers and athletes forced into repeated plantarflexion. The flexor hallucis longus runs in the groove between the tubercles, so tenosynovitis or entrapment can track directly to posteromedial ankle pain, and surgeons navigating posterior ankle arthroscopy use these landmarks to avoid neurovascular structures in the tarsal tunnel. This perspective also clarifies why posterior talar fractures or avulsion injuries can destabilize the subtalar and tibiotalar joints despite a small fragment size. Use this asset in gross anatomy and lower limb musculoskeletal courses when teaching the tarsus and ankle joint surfaces, or in radiology and sports medicine content alongside lateral ankle and hindfoot MRI/CT correlations for posterior impingement and os trigonum syndrome. It also fits operative technique materials covering posterior ankle arthroscopy portals and flexor hallucis longus decompression. Anatomical accuracy verified by SciePro's Medical Advisory Board.