Osteonecrosis of the femoral head (ONFH) is a common and difficult to treat disease worldwide. The International Society for Bone Circulation Research and the American Academy of Orthopaedic Surgeons define ONFH as a disease in which the blood supply to the femoral head is interrupted or impaired, causing death and subsequent repair of bone cells and bone marrow components, followed by structural changes in the femoral head, femoral head collapse, and joint dysfunction. Once femoral head necrosis occurs, without effective intervention, the majority of lesions will worsen progressively and have little chance of improving on their own. The progression of the lesion ends in the collapse of the femoral head to varying degrees, thus affecting the function of the hip joint. The main symptoms of femoral head necrosis are: 1, hip pain: implicit, progressive dull pain, occasionally acute attacks, pain is located in the groin area, some patients can be manifested as knee pain. 2, mild claudication: pain is obvious when standing or walking activities, and reduced after rest. Later, the symptoms worsen, limping occurs, squatting, cross-legged and other movements are obviously impaired, and in severe cases, walking with crutches is required, the movement of the hip joint is limited in all directions, and the affected limb is shortened. The key to the treatment of this disease is early detection. Early treatment can delay the development of osteonecrosis and prevent collapse and deformation of the femoral head. However, it is difficult to diagnose osteonecrosis of the femoral head in the early stage, because although there are symptoms such as pain in the early stage, or even worse, there is no feeling in the early stage, and the X-ray often does not show it, patients are often misdiagnosed as back and leg pain or rheumatism, so that the best time for treatment is missed.