The new therapy of shock wave treatment for femoral head necrosis has been carried out recently, mainly to improve femoral head necrosis by treating the necrotic area of the femoral head, to achieve a longer time for hip replacement, and partly even to achieve the goal of curing femoral head necrosis. (It is mainly effective for early and middle stage). Extracorporeal shock wave therapy (ESWT) is a new treatment for specific motor system disorders. Shock waves are a process of energy and momentum transfer, divided into mechanical and electromagnetic waves. The therapeutic effect is achieved by the sudden release of shock wave energy producing waves that act on local tissues. Mainly through the cavitation effect – to eliminate bone friction to produce pain, stimulate the embolized blood vessels, accelerate blood flow, improve blood circulation, activate osteoblasts, while through the stress effect – the action on bone tissue to form fine bleeding, accelerate the dead bone and necrotic tissue It also accelerates the decomposition of dead bone and necrotic tissues, promotes the regeneration of blood vessels and bone tissues, and thus achieves the therapeutic purpose. In addition, the biological and physiological effects of shock waves can also significantly suppress pain. In addition, extracorporeal shock wave therapy can be used to treat osteophytes, frozen shoulder, tennis elbow, early joint fusion, myosynovial adhesions, and sclerotic bone lesions.