Joint Replacement Joint replacement means removing part or all of a damaged joint and installing hardware to allow the limb to move without pain or limitations. The replacement hardware is called a prosthesis. These are made of plastic, metal, ceramic, or a combination of these materials. Most joint replacements are performed to treat damage from arthritis to the knees or hips. Orthopedic surgeons do the procedure under general anesthesia. Description Damaged cartilage and bone are removed from the knee joint. Man-made pieces are then placed in the knee. These pieces may be placed in the following places in the knee joint: The lower end of the thigh bone -- This bone is called the femur. The replacement part is usually made of metal. The upper end of the shin bone, which is the large bone in your lower leg -- This bone is called the tibia. The replacement part is usually made from metal and strong plastic. The backside of your kneecap -- Your kneecap is call