According to the common Ficat staging of femoral head necrosis, stage 0 means: there is cytological osteoclastic necrosis, but no pain, and no lesion is seen on X-ray, which rarely attracts patients’ attention; stage 1 means: there is pain and other symptoms, but no obvious lesion on X-ray, which may be detected by MRI; stage 2 means: there is pain and other symptoms, and cystic necrosis of the femoral head is seen on X-ray. Stage 3 refers to the enlargement and connection of the necrotic cystic lesions on the X-ray, forming a large “crescent-shaped” lesion under the joint surface of the femoral head, when the mechanical strength of the femoral head has been significantly reduced and the pain symptoms have increased, even affecting the rotational movement of the hip joint; Stage 4 refers to the collapse, deformation and softening of the femoral head under the pressure of weight-bearing walking on the X-ray. The pain is obvious in this stage, and the movement of the hip joint is obviously affected, not only the rotation is limited, but also the flexion and extension, and the squatting may be limited, and the lower limb may be slightly shortened, because the activity of the affected limb is obviously reduced, and the muscle wasting atrophy appears; stage 5 refers to: on the basis of stage 4, the friction of the cartilage on the acetabular side by the deformed femoral head The pain is severe in this stage, the patient’s joints are basically immobile, the muscles are atrophied, the lower limbs are shorter than the opposite side, and the ligaments around the hip joint are contracted. Femoral head necrosis is a difficult disease to treat, and the treatment is mainly related to the stage of the lesion. Early stage treatment is more effective, while later stage can basically only do joint replacement surgery. In early stage (0-2 stage), bone flap transplantation with vascular tip, bone drilling and decompression of femoral head and autologous bone grafting can be used to slow down the progress of femoral head necrosis and even stop the development of femoral head necrosis if the effect is very good. The effect of these surgeries was found to be very poor. Eventually, stage 4 and 5 can only be replaced by joint replacement. Joint replacement is an effective method to solve the pain and joint movement disorders caused by late stage femoral head necrosis, but because the artificial joint is like an artificial part, it will wear out and its service life is about 15 years (the more expensive ceramic to ceramic type joint can extend the service life of the artificial joint), so when the artificial joint wears out to the point of unusability, it needs to do a revision surgery, which is more expensive and the service life of the repaired joint is shorter. The life of the joint is even shorter.