The time of femoral head collapse can be greatly delayed by tantalum bar implantation. The reconstruction rod for femur head necrosis is made of tantalum. 

Its pore spacing is large, close to the pore spacing of human trabecular bones. Its elasticity is close to the elasticity of human bones, and it has good biocompatibility. 

It can make the human bone tissue grow into the pores of the tantalum rod, and make the human bone and the tantalum rod integrate, so that the femoral head can bear its own weight and have a good supporting function.