The diagnosis of femoral head necrosis was made only after the use of X-ray technology in orthopedics. In other words, the diagnosis of osteonecrosis of the femoral head can only be confirmed by X-ray examination. As far as the current medical level is concerned, there is no ideal treatment method that can completely control the progress of femoral head necrosis. Some clinicians call osteonecrosis of the femoral head the “coronary heart disease” of the hip joint, which means that the blood supply to the arteries of the femoral head is the main reason for its occurrence. Studies have confirmed that the small artery that enters the femoral head is the terminal artery, which is thin and curved, and the blood flow is quite slow, so embolism can easily occur here. In China, the following conditions are the main causes of femoral head necrosis: long-term or heavy use of adrenocorticosteroids Prednisone, cortisone, dexamethasone, flumethasone, etc. are all such hormones. Long-term use of these hormones can cause disorders of fat metabolism in the liver and produce fat emboli. When the fat emboli flow with the blood to the femoral head and the terminal arteries of the humeral head and block these arteries, the femoral head and the humeral head will become necrotic due to ischemia. According to some statistics, if prednisone 15 mg is used daily for 1 month, the femoral head may become necrotic. Of course, high doses of hormones in a short period of time can be even more harmful. Long-term heavy alcohol consumption Long-term heavy alcohol consumption causes alcoholic femoral head necrosis in the northern region of China is more common. This is due to the fact that alcohol can cause liver damage and disorder of fat metabolism in the liver, resulting in fat emboli blocking the blood vessels in the head of the femur. Therefore, long-term heavy alcohol consumption is also the culprit of this disease. Diver surfacing decompression improper divers dive into deep water, because of the high pressure in deep water, for divers to breathe in the compressed air of oxygen and nitrogen will be “pressed” into the blood at the same time. At this time, if the diver quickly floats up from deep water, the nitrogen in his blood separates to form bubbles, which can block the small blood vessels in the femoral head, leading to femoral head necrosis. Therefore, divers should not “step in” when surfacing from deep water, but should decompress step by step to prevent the occurrence of this disease. Hip trauma The most common injuries are femoral neck fracture and hip dislocation, both of which can lead to disruption of blood supply to the femoral head and subsequent necrosis of the femoral head. According to statistics, the likelihood of femoral head necrosis in displaced femoral neck fractures is around 50%. Blood is hypercoagulable This is also an important cause of femoral head necrosis. The use of hormones and certain hemostatic drugs, as well as long-term heavy alcohol consumption, can slow down the blood flow and increase blood coagulation, which can easily form emboli, and once the emboli block the small arteries of the femoral head, it can cause ischemic necrosis of the femoral head. It is worth noting that the same hormones are taken and the same large amount of alcohol is consumed, why do some people suffer from femoral head necrosis while others do not? This may be related to the vascular structure of the femoral head and the immune status. According to clinical observation and research, most patients with femoral head necrosis have very thin blood vessels in the femoral head, which may be an anatomical factor for the occurrence of femoral head necrosis.