Total Knee Replacement is an operation in which we do not remove the whole joint, only the damaged surface of thigh bone (femur) and shinbone (tibia) are shaved off. Often, underside of the kneecap (patella) isalso removed and these surfaces are replaced with artificial parts. The new joint consists of a metal shell on the end of the femur, a metal platecovered with a plastic trough on the tibia, and if needed, a plastic button on the kneecap. It is an operation where one just resurfaces thedamaged knee joint, as is done in capping a damaged tooth.