Ischemic necrosis of the femoral head is due to various causes of impaired blood circulation to the femoral head, i.e., inadequate arterial perfusion and restricted venous return, and leads to increased intraosseous pressure. The most important problem is the blood flow to the femoral head, and to solve this problem, many approaches have been thought of, such as femoral head drilling and decompression, bone graft fusion, and musculoskeletal flap surgery, but after observation, the success rate is low, and the femoral head mostly collapses inevitably. The current consensus is that the blood flow to the femoral head should be restored, that is, the blood supply vessels of the bone flap should be thick and not prone to thrombosis, and sufficient high-quality bone graft should be given, especially the cancellous bone of the ilium, which is rich in bone marrow, and there are mesenchymal stem cells inside which have a key role in bone regeneration, while the content of BMP in the bone marrow is high, and BMP can also induce osteogenesis within the necrotic area of the femoral head, which greatly accelerates the process of femoral head necrosis. This greatly accelerates the repair of the necrotic area of the femoral head. The procedure with these characteristics is “iliac flap grafting with rotating deep iliac artery”. This procedure is performed by removing most of the synovial membrane, opening the head and neck, and removing the dead bone to reduce the intraosseous pressure and reestablish the blood circulation at the same time. The anatomical position of the deep iliac vessel bundle is constant, with little variation, and relatively easy to find, without tension, torsion, or angulation during transposition, which facilitates transposition of the graft. This vessel starts from the femoral artery and has an adequate blood supply, and the vessel tip is about 6-8 cm long, which can be transposed at will without anastomosis of the vessels and is certain to provide blood flow to the femoral head. There are generally 2-4 nutritional branches in the rotating deep iliac vessels with tipped bone flap and corresponding venous return, forming a complete circulatory system. Compared with other bone flap transplants with vascularized tips, the rotary deep iliac artery has a large amount of blood perfusion and a rich vascular network on the iliac membrane, and the transplanted bone block is a living bone with some vitality and can directly form bone, especially the bone block with periosteum has more membrane osteogenesis. The transplanted iliac bone flap is rich in bone marrow, and the content of BMP in bone marrow is high. BMP can also induce osteogenesis in the necrotic area of the femoral head, which greatly accelerates the repair of the necrotic area of the femoral head, and at the same time, due to the reconstruction of venous return and the reduction of intraosseous pressure, it also provides a good environment for the growth of new bone. Surgical approach: Under continuous epidural anesthesia, an S-P incision is used to expose the hip joint, and a window of about 3×2 cm is opened at the craniocervical junction. dead bone is thoroughly scraped to the subchondral bone, and in patients with cartilage surface collapse, the cartilage surface can be gently propped upward with a periosteal stripper, taking care not to break the cartilage surface. The deep iliac artery and its accompanying vein are dissected at the inferior border of the inguinal ligament, which emanates outward from the femoral artery or external iliac artery. The vascular tip was fixed with a No. 4 silk wire, and the vascular tip should not be twisted, and the skin was tractioned for 3 weeks after the operation, and weight-bearing was gradually applied after 3 months.