Femoral head necrosis is often caused by the following reasons: 1, long-term alcohol consumption, alcohol leads to blood embolism eventually causing ischemic necrosis of the femoral head, usually with a 3-5 year history of alcohol consumption, but the degree of femoral head necrosis is not necessarily proportional to the amount of alcohol consumption; 2, history of taking hormonal drugs, such as prednisone, dexamethasone, etc., mainly in patients with combined rheumatoid and asthma; 3, history of trauma, usually in patients with femoral neck fractures The chance of complicating femoral head necrosis after plate screw internal fixation is higher, especially in patients with failed internal fixation or multiple internal fixation surgeries. Staging: Femoral head necrosis is usually clinically divided into four stages, the first stage of hip pain usually appears occasionally, will reduce or disappear after rest, no obvious changes on the X ray, the second stage of pain is more frequent, the X ray shows the femoral head has shadow cystic changes, etc. but no collapse of the femoral head contour, the third stage or more will appear obvious hip pain, walking significantly aggravated, limping, the X ray shows the femoral head has dead bone sclerosis foci and the femoral head The head contour is collapsed and deformed. The fourth stage of severe hip pain, hip function is limited, X ray on the basis of the above osteoarthritis manifestations of narrowing of the hip gap Treatment: Phase I and early phase II can generally be treated with conservative medication, including rest, braking, blood treatment, all kinds of treatment of ischemic necrosis of the femoral head drug advertising is varied, especially traditional Chinese medicine, but in fact, conservative treatment is very little effect, if a period of treatment is not effective. To seek intervention in the hospital, especially before the femoral head collapses, once the femoral head collapses, the result can only be joint replacement. In the late second stage, minimally invasive surgical treatment can be used, such as decompression of the femoral head by drilling and decompression of the synovial membrane of the hip capsule; in the third stage, surgical treatment with vascular bone flap implantation can be used, and currently, tantalum rod implantation is also used for support. The effect of joint replacement surgery is determined, and the patient can go to the ground in 3 days. The disadvantage is that the artificial joint has a service life, usually only 15-20 years, and joint revision surgery will be done later.