Ankle Anatomy And Biomechanics Essay

496 WordsAug 16, 20112 Pages
Ankle Anatomy and Biomechanics Anatomically speaking, the ankle is composed of three different articulations: the talocrural (also termed tiobiotalar joint or mortise joint), the subtalar joint, and the distal tibiofibular syndesmosis. The first is comprised of the dome of the talus, the tibial plafond, and the medial and lateral malleolus. Laterally, this joint is supported by the anterior talofibular ligament, the calcaneofibular ligament, and the posterior talofibular ligament. Medially, the talocrural joint is supported by the deltoid ligament. The subtalar joint is formed between the bottom of the talus and the calcaneus, and it consists of two separate joint cavities anteriorly and posteriorly. The anterior joint cavity is named the anterior subtalar joint and is formed by the head of the talus, the anterior-superior facets, the sustentaculum tali of the calcaneus, and the concave proximal surface of the tarsal navicular. The latter is termed the posterior subtalar joint and is formed by the inferior posterior facet of the talus and the superior posterior facet of the calcaneus. The subtalar joint as a whole is supported by the deep ligaments, the peripheral ligaments, and the retinacula. As a whole, the ligaments stabilize the joint and separate the anterior and posterior joint capsules. Lastly, the distal tibiofibular syndesmosis is formed between the distal tibia and fibula. Stabilization of this joint is due to the thick interosseus membrane along with the anterior and posterior inferior tiobiofibular ligaments which form the roof for the mortise of the talocrural joint. Biomechanically speaking, the three different articulations of the ankle have different actions. The talocrural joint functions as a hinge joint in isolation, allowing mainly for plantarflexion and dorsiflexion. There is a larger range of inversion versus eversion due to

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