Femoral head ischemic necrosis is a multi-pathological mechanism that leads to localized poor blood flow to the femoral head, thus causing ischemia, necrosis of bone cells, trabecular fracture, and collapse of the femoral head. The disease has a high disability rate and seriously affects the life and work of patients. Early stage femoral head necrosis, also known as pre-collapse of the femoral head. The clinical manifestations are hip pain and walking disorder. There are many ways to treat ischemic necrosis of the femoral head, including medication and surgery, but the efficacy is not ideal. For patients with early stage femoral head necrosis, they can be treated with Chinese medicine methods or surgical methods such as femoral head drilling and decompression, femoral head drilling and decompression bone grafting and bone grafting, but the results are not ideal and there is a possibility of further necrosis and collapse of the femoral head. The ultimate method is artificial hip joint replacement. Currently, the United States has developed a trabecular metal – femoral head necrosis reconstruction rod for the treatment of early femoral head necrosis. Bone trabecular metal reconstruction rod is made of tantalum metal, which has the characteristics of human cancellous bone structure, with large pores, close to the pore distance of human bone trabeculae, and its elasticity is also close to the elasticity of human bone, with good biocompatibility, so it is also known as “metal bone”. It can make human bone tissue grow well into the pores of the metal tantalum rod, so that human bone and the metal tantalum rod become one, which has a very good supporting effect on the femoral head that will collapse. The procedure of taking the reconstruction rod for femoral head necrosis is less invasive and requires only a small incision in the lateral thigh, which can be performed under fluoroscopic guidance to accurately place the tantalum rod into the desired area and achieve good biological fixation and mechanical support. It can provide structural support of the subchondral bone and enable the repair of necrotic tissue; at the same time, it can delay or even avoid the collapse of the femoral head and postpone or even avoid total hip replacement. The results of clinical studies have shown that the trabecular metal AVN reconstruction rod provides mechanical support to the subchondral bone of the femoral head, keeps the femoral head that is about to collapse from collapsing, and provides a recanalization pathway to the necrotic area, thus delaying the collapse of the femoral head, delaying total hip replacement or preventing total hip replacement. The treatment effect of total hip replacement in patients with necrosis. Compared with traditional treatment methods, the implantation of trabecular metal AVN reconstruction rods for early stage femoral head necrosis is minimally invasive, less bleeding, simple, rapid, with low complication rate and quick recovery, and can be used to move around the next day after surgery. At present, the Reconstructive Rod for Femoral Head Necrosis (TMONII) has been approved by the FDA and SFDA in China, and now thousands of such surgeries have been carried out in the United States with great success. Since 2008, it has been marketed and started clinical application in China.