Femoral head necrosis mostly occurs in young and middle-aged men, depending on the patient’s age, the site and extent of necrosis, and whether the femoral head has collapsed, early treatment methods include: attempted decompression, fibula transplantation, necrotic lesion removal and compression bone grafting, etc. However, there is not yet a treatment method that is very effective for all types of femoral head necrosis treatment, the following is a new method of treating femoral head necrosis —- tantalum rod Implantation method. Tantalum is a gray, bright, hard metal that is resistant to wear and tear, acidic corrosion, body fluids, and tissue irritation, making it an ideal material for surgical implants. Tantalum rods are molded using steam deposition technology to obtain a honeycomb-like three-dimensional structure similar to cancellous bone. This biomaterial containing interconnected micropores with a porosity of 75% to 80%, thus providing an unobstructed channel for bone growth, and its ability to grow bone inward is two to three times higher than that of conventional porous coated materials, in addition to the following physical properties. (1) Porous tantalum has the same modulus of elasticity as bone, so it has the same stress and strain patterns within the femoral head; (2) Porous tantalum is primarily subjected to pressure, not bending and tension; and (3) The optimal location for porous tantalum implantation is on the upper lateral side of the femur so that it contacts and supports the subchondral bone plate. Work has been carried out on the treatment of femoral head necrosis with tantalum rods. The current treatment of femoral head necrosis with tantalum rods is mainly limited to cases before collapse and is not suitable for patients with femoral head collapse or a large area of necrosis with more cystic becoming.