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    Once the damaged talus is removed, as long as the size and shape of the replacement talus is right and the surface finish is smooth, it will work very much like the native bone. But, in cases that involve avascular necrosis of the talus, modeling its 3D-printed replacement is much more challenging.
    The anatomy of a talus bone is unique within the human body. Situated between the heel of your foot and your lower shin bones, tali (the plural for talus) are the keystones of the hindfoot, essentially serving as fulcrums between your lower legs and feet each time you take a step.
    The body of the talus is cuboidal in shape and articulates with the distal end of the tibia. It is covered dorsally by a trochlear surface, which also articulates with the distal end of the tibia. The lateral surface of the talus is triangular, smooth and concave for articulation with the lateral malleolus.
    A talar fracture is a break in the talus bone of your foot. The talus bone is a square, flat bone on top of the calcaneus (heel bone). It connects the heel with the lower leg bones to form the ankle. What are the signs and symptoms of a talar fracture? How is a talar fracture diagnosed?