Ischemic necrosis of the femoral head, also known as aseptic necrosis of the femoral head, is distinct from necrosis of the femoral head caused by septic infection. It has become one of the common and difficult to treat chronic diseases in orthopedic clinics. What factors are associated with ischemic necrosis of the femoral head? ① Long-term use of hormones, such as asthma, leukodystrophy, rheumatoid arthritis, lupus erythematosus, non-specific colitis and other patients need long-term use of hormones to control the condition; ② Alcohol abuse, alcoholism; ③ Femoral neck fracture, congenital hip dysplasia, congenital hip inversion and other diseases appearing in the hip joint local bone structure changes or local vascular injury; ④ Other diseases related to femoral head necrosis, such as bone It is worth noting that the same hormones are taken and the same large amount of alcohol is consumed, but why does osteonecrosis of the femoral head occur in some people while it does not occur in others? This may be related to the vascular structure of the femoral head and immune deficiency. 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.