The astragalus, or talus, is a bone in the tarsus, the group formed by the seven bones at the back of the foot. It is connected to the two leg bones, the tibia and fibula, and the calcaneus located in front, and helps move the ankle joint. The fracture of the talus, which is very rare, is the breaking of one of its parts, usually following a violent shock (car accident, sports injury...). Symptoms include sharp pain, often accompanied by swelling and bruising. For a simple fracture, without the displacement of a bone fragment, treatment only includes immobilizing the foot in a cast, but in case of complications, it is necessary to perform surgery.