Femoral head necrosis, also known as ischemic necrosis of the femoral head and aseptic necrosis of the femoral head, is a pathological process caused by a variety of factors that lead to insufficient blood supply to the femoral head, which triggers the death of bone cells and bone marrow cells, gradually progressing to the collapse of the femoral head and eventually forming the end-stage hip joint lesion. Therefore, people also call it “coronary heart disease of the femoral head” and “undead cancer”. In the face of this difficult disease, only a comprehensive understanding of the causes and symptoms of osteonecrosis can better understand and treat it! The main causes of osteonecrosis of the femoral head: 1, trauma factors In life, there may be car accidents, falls and other accidents resulting in fractures of the femoral neck or hip dislocation, if not treated in time, or the original trauma is too heavy, the chances of osteonecrosis of the femoral head later can be increased significantly. 2, the use of hormonal drugs long-term use of hormones can cause osteoporosis, arterial vascular obstruction, so that bone cells, bone marrow cells gradually necrosis. The chance of femoral head necrosis in patients who use small doses of hormones for a long time is about 20%, while the incidence of patients who use large doses of hormones for a short time is as high as 40%. If patients find hip and knee discomfort after using hormones, they should immediately seek medical treatment. 3, alcohol abuse Long-term heavy drinking will lead to the accumulation of alcohol in the body, which will not only lead to damage to liver function, but also increase the chances of blood vessel obstruction and increased blood viscosity, which will cause necrosis due to bone microcirculation disorders. Knowing the cause, what are the specific manifestations of femoral head necrosis? 1. Intermittent pain in the hip, buttock and groin area. 2. Restriction of hip joint movement. In the daily squatting and stair walking, the patient will not be able to squat. 3.Walking with a limp. After the pain gradually worsens, the patient will be unable to divide the strength equally between the two sides of the legs due to the pain, thus resulting in an unstable gait and limp. If the patient has these symptoms in daily life, please seek medical attention in time to avoid missing the best treatment time.