The main sources of blood supply to the femoral head are as follows: 1. From the synovial membrane around the femoral neck, after the femoral artery sends out small branches to reach the deep femoral artery, it will send out the internal and external rotor femoral arteries in front of and behind the femoral trochanter. These two arteries will continue to send out small branches upward, through the synovial membrane around the femoral neck, into the intersection of the femoral neck and articular cartilage, from here to penetrate into the femoral head, to achieve the role of blood supply, this part of the blood supply is the most important source of blood supply to the femoral head. 2, from the intramedullary blood supply, the intramedullary blood supply, mainly by the femoral stem and the coarctation of the small blood vessels penetrating between The blood supply from the round ligament of the femoral head is mainly from the small branches of the closed artery, which reach the inside of the femoral head through the round ligament of the femoral head, but the amount of blood supply from this area is very small.