What is a total knee replacement made of?
Total knees are made of metal and polyethylene. The piece covering the lower end of the femur (thigh bone) is made of a corrosion-resistant alloy of stainless steel, usually cobalt chromium or titanium. The opposing surface of the tibia (shin bone) is made of polyethylene and designed to mate with the piece attached to the femur. The undersurface of the patella (kneecap) is replaced with polyethylene, which moves against the metal of the femoral component. This combination of metal on polyethylene creates a joint of minimal friction and wear, helping to maximize the life of your new knee.
Total knees are made of metal and plastic. The piece which covers the lower end of the femur (thigh bone) is made of a corrosion-resistant alloy of stainless steel. The opposing surface of the tibia (shin bone) is made of plastic and designed to mate with that of the femur. The undersurface of the patella (knee cap) is replaced with plastic, which moves against the metal of the femoral component. This combination of metal on plastic creates a joint of minimal friction and wear, thus ensuring long life.
