The ankle joint is composed of the talocrural joint and distal tibiofibular joints. The talocrural joint also functions with the subtalar joint as part of the rear foot. The ankle joint is formed by the superior portion of the body of the talus fitting within the mortise, or cavity, formed by the combined distal ends of the tibia and fibula. The medial, superior, and lateral articular surfaces of the talus are continuous, as are those of the medial malleolus, the distal end of the tibia, and the lateral malleolus.