Knee replacement surgery is a medical procedure that involves removing damaged parts of the knee joint and replacing them with artificial components. This surgery is often recommended for individuals suffering from severe knee pain or limited mobility due to conditions like osteoarthritis or rheumatoid arthritis. The goal is to relieve pain and improve function. The procedure typically takes a few hours and is performed under anesthesia. After surgery, patients usually undergo physical therapy to help regain strength and mobility in the knee. Most people can return to normal activities within a few months, although full recovery may take longer.