The knee surgery where a metal replacement is used is called Total Knee Replacement (TKR). In this procedure, damaged or diseased parts of the knee joint are replaced with artificial components typically made of metal alloys (such as titanium or cobalt-chromium) and high-density plastic (polyethylene). The metal components replace the ends of the femur (thigh bone) and tibia (shin bone), while the plastic spacer acts as a cushion between them, mimicking the function of natural cartilage.

Total knee replacement is a common and effective treatment for severe knee arthritis or significant knee joint damage due to injury or other conditions. It aims to relieve pain, restore mobility, and improve overall knee function. The surgery is performed under anesthesia, and recovery typically involves physical therapy to regain strength, flexibility, and mobility in the knee joint.