The restoration of limb function after fracture mainly relies on functional exercise, also called practice, which is to restore the original function of the limb by flexion and extension, extension and rotation of the limb, and its principle is to have less activity in the early stage and more activity in the later stage. The activities are mainly active activities, supplemented by passive activities, that is, the patient mainly relies on himself to carry out functional exercises, and does not recommend passive massage, pulling, tugging, etc., to do so gradually and consistently. The rehabilitation of limb function requires a process that cannot be completed in one day, and generally takes 2-3 months, or even longer than 6 months or a year to restore the original function of the limb. When exercising, first exercise the muscle contraction and diastolic activities, then exercise the muscle driven joint flexion and extension, retraction activities, and then gradually down to the ground to support the weight-bearing walking function, and finally abandon the crutches to complete the normal walking exercise activities.