Early rehabilitation (within 1-2 weeks after injury): Characteristics: swelling, pain, instability of the fracture end and easy re-displacement of the injured limb. Method: On the basis of immobility of the injured limb, the muscles are contracted (tensed) and relaxed rhythmically to promote blood circulation in the affected limb and facilitate swelling reduction and fracture stabilization. Mid-term rehabilitation (2 weeks after injury to clinical healing of the fracture) Characteristics: The swelling of the injured limb gradually decreases, the pain is relieved, the fracture ends are fibrously connected, and the bone scabs are gradually formed. Methods: In addition to continuing muscle contraction exercises, gradually restore the movement of the distal and proximal unfixed joints of the fracture and the movement of the upper and lower joints of the fracture. Gradually change from one joint to several joints and from passive to active activities to prevent muscle atrophy and avoid joint stiffness. Physical therapy can also be used to reduce swelling and pain and to promote the formation of bone scabs. When the condition allows, you can get up and move around as soon as possible. Post-rehabilitation: (clinical healing or removal of external fixation) Characteristics: X-ray examination confirms that bony scabs have formed and the bones have a certain degree of support. However, most of them have decreased joint mobility of adjacent joints, muscle function atrophy and other dysfunctions. Methods: Strengthen the active activities and weight-bearing exercises of the injured limb joints, so that the functions of each joint can be rapidly restored to the normal range of activities and normal strength of the limb, and pay attention to the whole-body exercise and gait training.