Like the Syme ankle-level disarticulation, the knee disarticulation is an amputation done between bone surfaces, rather than by cutting through bone. In a knee disarticulation, the residual limb can generally tolerate some end weight bearing and provides a long mechanical lever that is controlled by strong muscles. The person retains a full-length femur, and the thigh muscles tend to be stronger because they are released at their distal (far) end, rather than transected at mid-muscle. Knee disarticulations have particular advantages for children who are still growing because the growth plates at both the top and bottom of the femur are preserved. A bulbous appearance and a longer knee center than the contra lateral side are among the chief disadvantages of this level
- The knee-disarticulation prosthesis is very similar to the above-knee prosthesis, except for the lower part of the socket and the knee mechanism. Before the introduction of the present day polycentric knee units, sockets for the prosthesis were usually made of leather and metal hinges were used to attach the socket to the shin. This type of prosthesis is still preferred by a few preferred even though it is bulky and control of the leg during the swing phase is difficult. However, most prefer one of the polycentric designs where the knee mechanism can be installed within the shin due to its special design.
- Patient treatment video