Artificial joint replacement is arguably one of the greatest breakthroughs in orthopaedic surgery in this century. It has been used to treat disorders of the shoulder, elbow, wrist, interphalangeal, hip, knee and ankle joints, but total artificial hip and knee replacements are the most common. The design and materials of artificial joints are the result of the continuous efforts of biomechanics experts, material engineers and orthopedic surgeons. They are made of metal and high-density plastic materials, and they are made according to the structure, shape and function of the human joint. In order to keep the joint and the bones together, it can be fixed with bone cement or the bone can grow into the joint by using a hole in the artificial joint. Who needs an arthroplasty? If you have had pain in your hip or knee for a considerable amount of time. The pain is starting to prevent you from walking normally or even limping. The distance you walk gradually decreases, your joint movement is limited, and sometimes the pain can develop or worsen when you walk up and down stairs or get up from a chair. When these symptoms gradually interfere with your life and work, do not wait to see an orthopedic surgeon, as you may need an arthroplasty.