The main clinical manifestations of osteonecrosis of the femoral head are joint pain and limitation of joint movement; the physical examination is characterized by limitation of internal rotation, external rotation and abduction of the hip joint. MRI and nuclear scans are often positive at the early stage of osteonecrosis of the femoral head, six months to a year earlier than the X-ray. Treatment: closely related to the clinical stage For early stage patients and patients with stage I and II radiographs, it is feasible to perform 1, medullary drill decompression 2, medullary drill decompression with bone graft 3, medullary drill decompression with bone graft (some people add cytokine-BMP2 directly along with bone graft) 4, medullary drill decompression with bone graft -BMP2) 4.Medullary drilling decompression with bone grafting (with the addition of bone marrow stem cells containing genetically modified BMP2) For patients with stage III and IV disease, the treatment method is selected according to the severity of their clinical symptoms. For patients with severe symptoms, osteotomy (acetabular osteotomy, upper femoral osteotomy) or even joint fusion surgery is feasible, which is especially suitable for those with heavy physical workload.