1. Knee disarticulation refers to the amputation of the entire lower leg. In the past, knee disarticulation prosthesis was not popular because of the clumsy appearance and heavy weight due to the limitation of material technology. In modern times, due to the development of knee disarticulation surgery technology and prosthesis assembly technology, knee disarticulation prosthesis has been greatly improved in both appearance and function. 2. The structure of knee disarticulation prosthesis is similar to that of the thigh. The difference is the use of a double-layer receiving chamber (soft inner layer, hard outer layer), with the end of the enlarged residual limb to bear the weight and suspension of the prosthesis. This type of prosthesis has better weight-bearing function and control of the prosthesis than the thigh prosthesis. It is worth reminding knee amputees that they should pay attention to strengthening the range of motion of the hip joint and posterior extension strength training after surgery to prevent the emergence of hip flexion deformity, which can seriously affect the use of the prosthesis once it occurs.