1.Conservative treatment (1) Avoid weight-bearing: you can first rely on cane, axillary cane and other supports to strictly limit weight-bearing, which can restore blood supply to ischemic tissues and protect them from pressure to control lesion development, prevent collapse and promote self-healing of ischemic necrosis of the femoral head. However, it is generally believed that weight-bearing restriction cannot save the development of femoral head necrosis. This method is mainly applied to elderly patients who are not suitable for surgical treatment, poor general condition, progressive ischemic necrosis and patients with poor prognosis. The possibility of self-healing is related to the size of the lesion and its distance from the joint surface: if the lesion is small or far from the joint surface, it can mostly heal by itself; if the lesion is adjacent to the joint surface or if the lesion is large in scope, the possibility of self-healing is extremely small even without weight-bearing. (2) Electrical stimulation: It has osteogenic effect and can promote fracture healing. Electrical stimulation can be used as an independent treatment for osteonecrosis or as an adjunct to surgery. 2, surgical treatment (1) treatment to preserve the femoral head: applicable to early osteonecrosis of the femoral head. (1) Borehole decompression: It can reduce the intraosseous pressure, promote venous return, release the spasm of trophoid vessels, and enable the new blood vessels to grow into the ischemic area along the bone hole. It is mainly used for patients without joint surface collapse in early stage, and is the simplest surgical method to treat osteonecrosis. ②Osseous grafting: Because it is necessary to drill holes before bone grafting, it is also called drilling and decompression osteotomy. There is both drilling and decompression, bone graft to provide mechanical support, and bone graft with myotome to increase the blood supply to the femoral head. (3) Osteotomy: By changing the corresponding position between the femoral head and the femoral stem, it can increase the weight-bearing area of the femoral head, reduce the pressure on the femoral head, move the necrotic lesion out of the weight-bearing area, and thus reduce the local stress, at the same time, the osteotomy opens the medullary cavity, which can reduce the intraosseous pressure and improve the blood circulation of the femoral head. (2) Arthroplasty: It is applied to patients with collapsed femoral head necrosis, and metal cup arthroplasty, joint surface replacement, femoral head replacement, total hip replacement, etc. are feasible.