With the increasing incidence of osteonecrosis of the femoral head, people’s concern about the disease is also increasing, the cause of osteonecrosis of the femoral head has been a hot topic and more consultation with friends, the causes of osteonecrosis of the femoral head are complex, mainly the following trauma leading to osteonecrosis of the femoral head. Such as external impact caused by femoral neck fracture, hip dislocation, hip joint sprain and contusion. Trauma is the main factor causing femoral head necrosis. However, the occurrence and extent of traumatic femoral head ischemic necrosis mainly depend on the degree of vascular destruction and the compensatory ability of collateral circulation. Zhang Baofeng, Department of Orthopedics, Jinan Hospital of Traditional Chinese Medicine Drugs cause femoral head necrosis. Such as long-term use of hormonal drugs due to bronchitis, asthma, rheumatism, rheumatoid, neck, shoulder, back and leg pain, diabetes, skin disorders, etc. The occurrence of femoral head necrosis is directly related to the type, dosage form and route of administration of hormones, and is not directly proportional to the total amount and duration of hormones. However, the long-term use of large amounts of hormones or excessive daily doses and sudden changes in dose increases and decreases are also one of the reasons for the occurrence of femoral head necrosis. Alcohol stimulation causes femoral head necrosis. The accumulation of alcohol in the body due to long-term heavy drinking leads to the increase of blood lipids and the damage of liver function. The increase in blood lipids causes an increase in blood viscosity, slows blood flow, and changes blood coagulation, which can lead to blood vessel blockage, bleeding or fat embolism, resulting in osteonecrosis. Osteonecrosis due to hip dysplasia. It is more common in female patients, with clinical manifestations such as duck walk, short affected limbs, muscle atrophy, gradual increase in pain and functional limitation for about 50 meters of walking.