Femoral head necrosis, also known as ischemic femoral head necrosis, is a progressive pathological process in which the femoral head becomes ischemic, necrotic, and collapses due to a variety of different causes. A preliminary survey found that the number of patients with osteonecrosis of the femoral head in the world is 30 million. It is a common and intractable disease in orthopedics, and is most common in young people between the ages of 30 and 50. Femoral head necrosis is generally high in the following five groups of people: 1, the application of hormone therapy: some patients need to use hormone therapy because of the needs of the disease, this group of people are more prone to femoral head necrosis (here the hormone refers mainly to glucocorticoids). 2, hip trauma population: people who have had femoral head and neck fractures, acetabular fractures, hip dislocations, serious sprains or contusions of the hip. 3, high coagulation and low fibrinolytic tendency and autoimmune patients: even with small doses of glucocorticoids (<1000mg) or without glucocorticoids, this group of people are prone to femoral head necrosis. 4, people with a history of decompression chamber work: because of the water pressure will cause pressure on the femoral head. 5, long-term heavy alcohol consumption: clinical data have confirmed that long-term heavy alcohol consumption, femoral head necrosis rate significantly increased.