A total knee replacement (TKR) is a surgical procedure whereby the damaged or worn cartilage and several millimetres of bone beneath it are removed in the knee joint. This removed bone and cartilage is then replaced with metal components (usually titanium-based). These pieces are then fixed onto the ends of the femur (thigh bone) and tibia (shin bone) and a piece of special, longwearing, plastic (highly cross-linked polyethylene) is placed between them. In some cases, the cartilage on the underside of your knee cap (patella) may also be replaced. Just like there are many makes and models of motorcar, there are many different brands and sizes of knee replacements. Associate Professor Kurmis will choose a type of knee replacement that best suits your knee and desired function.