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The calcaneus, or heel bone, is a large cancellous bone that is located in the heel, in the tarsus on the back of the foot. It consists of three parts and six faces. Its elongated and flattened shape allows one to put the heel flat on the ground. The Achilles tendon is attached to the calcaneus. The calcaneus may be fractured, usually in several locations. These fractures can lead to osteoarthritis or a callus. The calcaneus is also prone to inflammation, which can be relieved by wearing orthopedic insoles.