Talar fracture and dislocation

The talus is the only bone in the whole body that has no muscles, only the synovium, joint capsule, and ligaments are connected, so the blood supply is poor, non-healing and aseptic necrosis are common. The incidence of such injuries accounts for about 1% of foot fractures. Although it is very rare, it causes many problems, which is one of the clinically important problems. The talus is divided into the head, neck and body; the head and the scaphoid constitute the talar scaphoid joint, and the rear is the narrow talar neck; the talar body is located at the rear, which not only has the largest volume, but also has an ankle joint in the shape of a pulley and the lower end of the tibia This is the part where the power transmission is most concentrated, which is easy to cause damage. About 60% of the surface of the talus is covered by the cartilage surface, and the edge of the upper articular surface also has cartilage continuation. There is a protruding posterior nodule behind the talar body. If it is not fused with the body during development, it will form a free triangular bone block with a smooth peripheral part, which is often seen on plain radiographs, which is easily confused with avulsion fractures. The talus has no muscle attachment, but it is connected to the joint capsule and synovium and accompanied by blood vessels. If a tear occurs during trauma, it is easy to cause ischemic necrosis due to interruption of blood supply.