Total hip replacement (THR) is an effective method to treat hip joint disease. It's an advanced technology and is widely used. But it still has its faults. After THR, there are always the problems such as the interface will loose, the artificial hip will break and loose etc.There is more than forty years from the time when the artificial hip was first used. Many people have paid great attention to improve the quality and the lifetime of artificial hip in human body. The shape of artificial hip was not very ...