Artificial knee arthroplasty is a procedure that removes the deformed surface of the knee caused by osteoarthritis and rheumatoid arthritis and replaces it with an artificial knee component. The replacement of the joint components allows for the possibility of re-gliding of the joint, and all three components – femoral, tibial and patellar – can be replaced. The main parts of the femur and tibia are made of metal, while the top surface of the tibia and patella are made of a durable plastic, which can replace cartilage. In addition, the O-shaped leg associated with osteoarthritis of the knee joint can be corrected during surgery. The joint components used vary depending on the severity of the disease. In mild cases, the surface of the joint can be removed and replaced, but in severe cases, more complex knee parts are used to fill in the missing bone tissue.