Femoral head necrosis was diagnosed only after the use of X-ray technology in orthopedics. In the past hundred years, orthopedic surgeons and basic medical practitioners have conducted in-depth multidisciplinary research on this disease, and new diagnostic and therapeutic methods have emerged. However, at the current level of medical care, there is no ideal treatment that can completely control the progression of osteonecrosis of the femoral head. How does osteonecrosis of the femoral head occur? Some orthopedic surgeons refer to osteonecrosis of the femoral head as the “coronary heart disease” of the hip joint. In other words, the main cause is the disruption of the blood supply to the arteries of the femoral head. The arteries that enter the femoral head eventually divide into small arteries called terminal arteries. These small arteries are very 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 use of adrenocorticosteroids Prednisone, cortisone, dexamethasone, flumethasone, etc. are all adrenocorticosteroids. Long-term use of these drugs can cause disorders of fat metabolism in the liver, resulting in fat emboli. When the fat emboli flow with the blood to the head of the femur and the humeral head of the terminal artery, blocking these arteries, will cause the head of the femur or humeral head of ischemia and necrosis. According to statistics, if prednisone 15 mg is used daily for a month, there is a possibility of femoral head necrosis. Of course, high-dose shock therapy in a short period of time can be even more harmful. There are some diseases that require the use of hormones, such as certain immune system diseases, skin diseases, kidney transplants, etc. However, there are also untrained primary care providers who use hormones inappropriately, causing femoral head necrosis to occur in many innocent patients. What is more alarming is that some “secret ancestral prescriptions” and “experimental prescriptions” are adulterated with hormones, so that some patients with back pain, joint pain or skin diseases or immune system diseases have better control of their symptoms from the surface, but adverse reactions will follow. However, adverse effects may follow. Therefore, we remind everyone, especially the middle-aged and elderly friends, if after taking these “miracle drugs”, their symptoms are quickly controlled, appetite increases, the spirit multiplies, and the drug has addictive properties, just like athletes taking stimulants, the drug is very likely to be adulterated with hormones. Therefore, those patients with joint pain should go to a regular hospital for detailed examination first, so that a clear diagnosis and standardized treatment is essential. Alcohol consumption Long-term heavy alcohol consumption can lead to alcoholic femoral head necrosis. This disease is more common in people who drink a lot in the northern part of China. Because alcohol can cause liver damage, resulting in disorders of fat metabolism in the liver, resulting in fat emboli, blocking the blood vessels in the femoral head and occurring femoral head necrosis. Trauma to the hip The most common is femoral neck fracture and dislocation of the hip joint, due to the interruption of blood supply to the femoral head and the occurrence of femoral head necrosis. According to statistics, the likelihood of femoral necrosis in displaced femoral neck fractures is about 50%. This is also an important cause of femoral head necrosis. The use of hormones and certain hemostatic drugs, or heavy alcohol consumption, can slow down the blood flow and cause the blood to clot and form emboli, blocking the small arteries in the femoral head and causing the femoral head to necrosis due to ischemia. Decompression sickness This is an occupational disease. When a diver dives into deep water, the pressure in the deep water is very high, and the oxygen and nitrogen in the compressed air for the diver to breathe are “pressed” into the blood at the same time. If the divers quickly float from deep water, the nitrogen in the blood separates to form bubbles, which can block the small blood vessels in the femoral head. Therefore, divers from high-pressure deep water surfacing, not “one step in place”, but should be step-by-step decompression, to prevent this situation. It is worth noting that the same use of hormones, the same large amount of alcohol, why some people have femoral head necrosis, while others do not occur? 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 osteonecrosis of the femoral head have very thin blood vessels supplying the femoral head, which may be an anatomical factor in its development, and is closely related to genetic and racial differences. Although osteonecrosis of the femoral head is very common in China, if the above-mentioned predisposing factors can be avoided, the incidence will definitely be reduced.