”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 various reasons. 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 mostly found 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 hormones Treatment of 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 Crowd 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 patient group Even with small doses of glucocorticoids (<1000mg) or without glucocorticoids, this group of people are prone to femoral head necrosis; 4, a history of decompression chamber work Crowd because of the water pressure will be on the femoral head The clinical data have confirmed that the rate of femoral head necrosis is significantly higher in people who drink a lot of alcohol over a long period of time.