This is a problem that many patients with osteonecrosis of the femoral head are very worried about. Experts tell us that if osteonecrosis of the femoral head is found late or not treated effectively, it will leave such and such sequelae because it cannot be cured. The most common sequelae of femoral head necrosis are caused by three conditions: separation of the trabeculae from the cartilage, subchondral fracture of the femoral head and multiple fracture-like translucent band changes in the femoral head. Multiple lamellar or banded sclerotic dense bone changes within the femoral head, collapsed femoral head, flattened hypertrophic signs, reduced or absent bone trabeculae, and reduced joint space. Multiple large cystic translucent changes in the femoral head, multiple sclerotic high-density bone changes, severe collapse and deformation of the femoral head, flattened hypertrophy, and narrowing or loss of joint space. When the sequelae of femoral head necrosis appear, physical therapy or other treatments should be given in time, and clinical cure can usually be achieved. However, a small number of patients may suffer from sequelae of varying degrees due to insufficient rest or other reasons. In the first case, 95 percent of the patients with osteonecrosis of the femoral head can be completely cured. Only a small number of patients have a mild claudication of the femoral head, but this will disappear within six months or a year. The sequelae of osteonecrosis of the femoral head are usually caused by untimely or improper treatment, which requires you to pay more attention to the physical changes in daily life, and once the condition is found, you should go to the hospital for examination and treatment of osteonecrosis of the femoral head in time, and do a good job of usual care to prevent the sequelae.