![]() ![]() 9 The talar body and dome are predominantly perfused by the posterior tibial artery with secondary contributions from the peroneal artery that anastamose in the subtalar joint through the tarsal canal (posterior tibial artery) and tarsal sinus (branch of the peroneal artery). 9 The talar head also gets contributions from the dorsalis pedis and the artery of the tarsal sinus. The extraosseous blood supply of the talus is an amalgam of contributions from the anterior tibial artery, posterior tibial artery, and perforating peroneal artery, though the posterior tibial artery is the largest contributor through its branch to the tarsal canal. The blood supply ( Figure 1) also follows a unique and delicate pattern, with several vessels contributing the predominantly cartilaginous surface greatly limits the available regions for perforating perfusion. ![]() It is supported by the calcaneonavicular (“spring”) ligament that maintains the plantar arch. ![]() 20 The talar head is convex, fully coated in articular cartilage, and articulates with the navicular bone. Anterior to the body, the neck does not possess any articular cartilage, and has varus and plantarflexed neck-body angles of 10 to 44 degrees and 5 to 50 degrees, respectively. The cartilaginous medial and lateral walls are irregular, and the subtalar concave surface makes up the floor. 10 The body is trapezoidal, bordered superiorly by the convex talar dome. 32 Structurally, it transfers loads from the tibia to the remainder of the foot. It is anatomically divided into 3 main structures: the body, the neck, and the head, as well as the lateral and posterior (along which runs the flexor hallucis longus tendon) processes. The talus is 60% to 70% covered in articular cartilage, 27 but has no muscular attachments, and articulates with adjacent bony structures via capsuloligamentous restraints. Talus injuries present a diverse, unique set of challenges in management with a profound impact on the short- and long-term functional outcomes for the patient. ![]()
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