Knee replacement, also known as knee arthroplasty, is a surgical procedure that involves replacing a damaged or diseased knee joint with artificial components. It is typically recommended for patients suffering from severe osteoarthritis, rheumatoid arthritis, or post-traumatic arthritis when conservative treatments such as medications, physical therapy, and injections have failed to provide relief. The surgery aims to alleviate pain, restore function, and improve the quality of life. During the procedure, the surgeon removes the damaged cartilage and bone from the surface of the knee joint and replaces them with metal and plastic components designed to mimic the movement of a natural knee. Recovery involves a combination of rest, physical therapy, and gradual return to activities, with most patients experiencing significant improvement within months. Advances in surgical techniques and implant materials have made knee replacement highly successful, with many patients enjoying pain-free mobility for 15-20 years or more. However, it is essential to consider the potential risks, such as infection, blood clots, and implant wear, and to follow the surgeon's recommendations closely during the recovery process. Overall, knee replacement can be a transformative procedure for individuals debilitated by knee pain, offering a renewed opportunity for an active and fulfilling life.