Typically, a cast is applied after an ankle fracture and the braking time is about six weeks. Initially, cast braking is performed mainly to provide a quiet mechanical environment for the fracture, which allows the fracture to repair itself without external load. During the period of cast braking, it is important to elevate the lower extremity to facilitate the reduction of the swelling of the limb. At six weeks, X-rays can be taken to observe the fracture healing. If there is continuous bone scab passing through the fracture end, it means the fracture is healing well and has a certain stability. Functional exercises of the joint should be carried out to prevent muscle atrophy and improve joint stiffness. At this time, it is not yet possible to abandon the crutches and walk with full weight until the fracture has reached clinical healing in three months.