There are many methods of rehabilitation exercise for femoral head necrosis. Reasonable rehabilitation exercise under the guidance of a rehabilitator has a positive effect on relieving symptoms, preventing muscle atrophy and promoting recovery. It can be done through lying straight leg raising, swimming, lying empty pedal bicycle and so on. 1. Lying straight leg elevation lying down, elevate the affected limb, in the case of no pain, try to bend the hip and knee joints, and then put the affected limb flat. Do this 200 times a day in 3 to 4 sessions. 2. Sitting position, separate the law: sit on a chair, hands on the knees, feet apart, shoulder width apart, the knee joints at the same time to maximize outward and inward activities. 300 times a day, divided into 3 to 4 times to complete. 3. Standing Leg Lifting Method: Hold on to the fixtures, keep the body upright, raise the affected limb, bend the hip and knee joints at 90 degrees, make the body and thighs at a right angle, and then lower the affected limb. 300 times a day, divided into 3 to 4 times to complete. 4. Internal rotation and adduction method: hold on to a fixed object, the lower limb can do a circle movement, 300 times a day, divided into 3 to 4 times to complete. Auxiliary exercise: walking with crutches or riding a stationary bicycle, 2 times a day, 30 minutes each time. It should be noted that if the necrosis of the femoral head is more serious, surgical treatment is needed, and rehabilitation exercises are carried out according to the requirements of different surgical styles after treatment. It is recommended that patients with necrosis of the femoral head avoid too strenuous exercise, pay attention to the daily life can not be weight-bearing, under the guidance of the rehabilitation doctor to carry out scientific exercise, in order to avoid secondary injury.