There are three main causes of femoral head necrosis: hormonal drugs, that is, before the patient got femoral head necrosis, he used to apply a lot of hormonal drugs, such as cortisone, prednisone, dexamethasone and other drugs, and hip pain occurred after three months and six months or a year, that is, he got femoral head necrosis; traumatic femoral head necrosis, that is, caused by hip fracture, dislocation and sprain and contusion; in addition, there are a small number of hip joint In addition, there are a small number of hip dysplasia, blood disease, large bone disease, hypertension, radiation disease, can also cause osteonecrosis of the femoral head. Large amount of alcohol abuse causes femoral head necrosis According to the statistics of more than 300 patients. Drinking half a kilogram of liquor every day may lead to femoral head necrosis in about 10 years, and drinking 1 kilogram of liquor every day may lead to femoral head necrosis in about 5 years. This is one of the main reasons for the apparent increase in ischemic necrosis of the femoral head in recent years.