[Theoretical principles of cemented prostheses].

Today total hip replacement has become a routine procedure in older patients all over the world. A good result is to be expected only, if the device will meet the following requirements: adequate force transfer to the bone, adequate stiffness and elasticity, sufficient range of motion, biocompatibility of the material, low friction, low rate of wear, sufficient lubrication and a secure anchorage. Up to now, the weak point is the bone cement. Advancements in its composition and improved cement techniques will guarantee good function without pain during a long enough period of time.