The technique of treating severe knee disease with an artificial joint replacement is well established. Currently in the United States, approximately 800,000 patients undergo this procedure each year. In traditional knee replacement surgery, the length of the surgical incision in the skin in front of the knee takes about 15 to 20 centimeters. In recent years, American orthopedic surgeons have invented a new surgical technique called minimally invasive prosthetic joint replacement, which uses a minimally invasive technique to reduce the length of the skin incision by about 40% or so compared to the traditional surgical approach, meaning that the surgery may cause relatively little damage to the surrounding soft tissues. In other words, the surgery is less invasive, the patient bleeds less intraoperatively, the postoperative recovery will be faster, the hospital stay can be shortened, and the incision becomes much more aesthetically pleasing. It is important that the joint is placed in a precise position in the body so that it is less painful, moves well, and lasts longer. The disadvantage of a small incision is that it can affect the surgeon’s view and the accuracy of the placement of the prosthesis. Some surgeons also believe that this technique does not offer significant advantages over the standard surgical approach. It is not yet clear whether this new technique will affect the long-term function of the joint and the longevity of the prosthesis. In any case, a few centimeters longer incision and a few days longer hospital stay are far less than the long-term function of the joint. It is never the doctor’s intention to pursue the length of the incision without considering the accuracy of the placement of the artificial joint and its long-term results. The small incision technique is not suitable for patients who are overweight, have severe joint deformities, or have limited joint motion. The future focus of minimally invasive knee arthroplasty is to ensure the accuracy of the placement of the prosthesis. Some experts believe that incorporating computer navigation technology is the way forward.