精选优质文档-倾情为你奉上TEXT ADo you realize that every time you take a step, the bones in your hip are subjected to forces between four and five times your body weight? 81When you are running, this force is increased further still. What happens if through disease a hip-joint ceases to be able to resist such forces? For many years hip-joints and other body joints have been replaceable either partially or completely. It is after all a simple ball and socket joint; it has certain loads imposed on i
