Femoral head ischemic necrosis is a disease caused by poor blood supply to the femoral head due to multiple factors, resulting in ischemia, necrosis of bone cells, fracture of bone trabeculae, and collapse of the femoral head. Severe collapse of the femoral head leads to severe wear and tear of the hip joint, resulting in a high disability rate and seriously affecting the life and work of patients. At present, there are about 30 million people suffering from this disease worldwide. In China, there are about 4 million patients with ischemic necrosis of the femoral head. The clinical staging method has an important guiding significance for the selection of treatment plan. The current staging methods for femoral head necrosis include Ficat staging (1980), international staging (ARCO), comprehensive staging, Steinberg staging, etc. The commonly used Ficat staging method is to divide femoral head necrosis into 5 stages based on X-ray performance and functional bone examination. stage 0: the patient is asymptomatic and the X-ray is normal; stage I: the X-ray performance is normal, or there is mild diffuse osteoporosis, the patient has pain and restricted hip movement, and the functional bone examination may detect positive results; stage II: the X-ray shows extensive osteoporosis, osteosclerosis or cystic degeneration, and the contour of the femoral head is normal. Stage II: X-ray shows extensive osteoporosis, osteosclerosis or cystic degeneration, normal contour of the femoral head, histopathological changes on core biopsy, and obvious clinical symptoms; Stage III: X-ray shows sclerosis and cystic degeneration within the femoral head, collapse of the femoral head, crescentic sign, normal joint space, and obvious increase in clinical symptoms; Stage IV: osteoarthritis stage, X-ray shows collapse of the femoral head, narrowing of the joint space, obvious clinical pain, and obvious restriction of hip joint movement in all directions. We call stage 0, 1 and 2 femoral head necrosis as early stage of necrosis. In this stage, because the femoral head is not collapsed, if effective intervention treatment is carried out for this stage of lesion, more satisfactory results can be achieved. However, stage 3 and above can often only be treated with joint replacement. The theoretical basis is that the intraosseous pressure in the necrotic femoral head is increased, and the decompression of the medullary core will reduce the intraosseous pressure, improve the blood circulation in the femoral head, and relieve the pain. However, the drawback of post-medullary core decompression is that the mechanical strength of the decompressed femoral head is reduced, and it is more prone to collapse before its repair. How to overcome this drawback and provide both decompression to promote bone ingrowth and good intra-femoral mechanical strength to provide effective head support is the goal pursued clinically. The development of material science always drives the progress of medical technology, and a new material emerged – tantalum rod implantation, which is a new material and method on the treatment of early femoral head necrosis. Due to its good biocompatibility and elastic modulus with bone tissue, porous tantalum has sufficient strength to withstand physiological loads, which is a good support for the femoral head that is about to collapse. The diameter of the pore spacing of the porous tantalum rods is suitable for the smooth growth of the bone trabeculae, and the elastic modulus is almost identical to that of the bone, which reduces the presence of stress masking and the chance of osteoporosis in the femoral head. The combined use of marrow core decompression and porous tantalum rod implantation under small incision minimally invasive has the advantages of less trauma, less bleeding, faster postoperative recovery and lower surgical risk. It can provide good subchondral bone structural support, reduce the pressure in the necrotic area of the femoral head, promote bone regeneration, delay the time of femoral head collapse and postpone the time of total hip replacement; it is the most advanced minimally invasive method for the treatment of femoral head necrosis internationally, especially suitable for patients with early femoral head necrosis. The Department of Osteoarthritis of our hospital constantly pursues to follow the new international concepts and technologies, and has taken the lead in carrying out this new technology in the province, completing many cases of tantalum rod treatment for early necrosis of the femoral head and achieving more satisfactory clinical results.