Knee replacement, also known as knee arthroplasty, is a surgical procedure performed to relieve pain and restore function in severely diseased knee joints. It involves removing damaged cartilage and bone from the surface of the knee and replacing them with artificial components made of metal and plastic. This procedure is commonly recommended for patients suffering from chronic knee pain due to osteoarthritis, rheumatoid arthritis, or traumatic injury when other treatments like medication, physical therapy, or injections fail to provide relief. Knee replacement can significantly improve mobility, enhance quality of life, and allow patients to return to everyday activities with reduced pain and increased joint stability.