Femoral head necrosis is a common clinical disease, because its main pathology is the ischemia of the head bone caused by the obstruction of blood flow to the femoral head, so it is mostly called ischemic necrosis of the femoral head or aseptic necrosis of the femoral head. The age of onset is more common in young adults, and more men than women. The etiology of femoral head necrosis is diverse (about 60 kinds) and complex, and it is difficult to classify comprehensively and systematically, which is related to the unclear pathogenesis. The main ones are as follows: (1) Trauma leading to femoral head necrosis. Such as femoral neck fracture caused by external impact, hip dislocation, hip sprain and contusion, etc. Trauma is the main factor causing femoral head necrosis. (2) Drugs cause osteonecrosis of the femoral head. Such as bronchitis, asthma, rheumatism, rheumatoid, neck, shoulder, back and leg pain, diabetes, skin disorders, etc., and long-term use of hormonal drugs. (3) Alcohol stimulation leads to femoral head necrosis. The accumulation of alcohol in the body due to long-term heavy drinking leads to the increase of blood lipids and damage of liver function. The increase in blood lipids causes the increase in blood viscosity, slows down the blood flow, and changes the coagulation of blood, thus blocking the blood vessels and causing bleeding or fat embolism, resulting in osteonecrosis. (4) Osteoporosis leads to osteonecrosis. (5) Bone marrow abnormal proliferation leads to osteonecrosis. (6) Bone tuberculosis combined with osteonecrosis. (7) Post-operative osteonecrosis. (8) Decompression disease leading to osteonecrosis. Among the above factors, osteonecrosis of the femoral head caused by local trauma, hormonal drug abuse, and excessive alcohol consumption is common. The common core problem is the impaired blood circulation of the femoral head caused by various reasons, which leads to ischemia, degeneration and necrosis of bone cells. In Chinese medicine, the liver, spleen and kidneys are considered to be the three organs most closely related to the necrosis of the femoral head. The kidneys are the foundation of the innate nature, and they are responsible for the production of marrow. If the kidney is healthy, the marrow will be full, and if the marrow is full, the bone will be firm. If the liver is involved, the blood collection is not properly regulated and if the blood is not well stored and transported, the nutrients are not good, which is also an important factor in ischemic femoral head necrosis. If the spleen and stomach are healthy, the water and grain will ripen and turn into gas and blood to carry out the camping and defense. If the spleen is not healthy, and there is no source of gas and blood biochemistry, the tendons and muscles will have no blood to produce.