Femoral head necrosis is a pathological evolutionary process that initially occurs in the weight-bearing area of the femoral head, with damage to the trabecular structures of the necrotic bone under stress, i.e., microfracture and subsequent repair process for the damaged bone tissue. The causes of osteonecrosis are not eliminated, the repair is not perfected, and the process of injury-repair continues, leading to structural changes in the femoral head, femoral head collapse, deformation, joint inflammation, and functional impairment. Femoral head necrosis will certainly cause pain, joint movement and weight-bearing walking dysfunction, but people should not be influenced by the horrible meaning of the words “bad and dead”, because necrosis of the femoral head, after all, is limited and involves individual joints, which can be reduced, fade and heal by itself. The ability to walk can be restored. Who is vulnerable to femoral head necrosis? 1, long-term application of glucocorticosteroids one is due to the patient’s condition as a last resort, need to take a large number of long-term glucocorticosteroids, the other is due to some doctors or patients themselves long-term misuse of hormone therapy. 2, long-term heavy drinkers With the development of society, people’s interaction is increasingly frequent, long-term heavy drinking is sometimes inevitable, and alcoholics are fond of wine, drinking without restraint. The rapid development of transportation, the rapid change of transportation, the incidence of traffic accidents is also increasing year by year, life, work, sports and carelessness caused by the femoral neck fracture, hip dislocation or hip trauma without fracture dislocation can cause damage to the blood vessels supplying the femoral head, laying a great hidden danger for the future necrosis of the femoral head. Among them, femoral neck fracture with femoral head necrosis is the most common, accounting for about 30% of such fractures. 4, other diving, flying personnel, obesity, hypertension, diabetes, arteriosclerosis, gout, radiotherapy, post-burn, hemoglobinopathy, etc., are also at high risk of femoral head necrosis.