After femur fracture, you need to exercise the function of the knee joint and the muscle strength of the leg, including quadriceps isometric contraction training, straight leg raising training, etc. The training of joint mobility: it mainly includes hip, knee and ankle flexion and extension activities. 1. Joint mobility training: mainly include hip, knee and ankle flexion and extension activities, early passive activities with the help of the rehabilitation therapist, gradually transition to active activities, to maintain the normal mobility of the joints, to prevent the joints from adhesion and stiffness. 2. Straight leg raising training: patients choose the lying position, straighten the leg on the affected side and tense it, raise it slowly and evenly, and leave the bed surface about 25 centimeters. 3. Quadriceps isometric contraction training: patients choose to lie down, keep the foot surface perpendicular to the bed, and tense the thigh muscles for 5 seconds and then relax, to help the muscles gradually restore function. 4. Weight-bearing training: After the fracture healing is stabilized and the doctor agrees, weight-bearing training can be started. Gradually transition from double crutches to single crutches and abandon crutches to improve the weight-bearing function of the lower limbs. It is recommended that patients under the guidance of a professional doctor to carry out treatment, the specific exercise methods need to be combined with the patient’s own situation, not blindly self-exercise, to avoid aggravating the condition.