The knee disarticulation amputation (through-the-knee-amputation) is carried out if it is no longer viable to maintain a brief residual section of the lower leg. Due to the structural, functional, and aesthetic requirements, only modular prostheses can suit disarticulated knees. In contrast to a transfemoral amputation, the remaining limb after knee disarticulation may be completely filled. No tuberous seat is required since femoral condyles transfer body weight to the prosthesis socket. The condylar residual limb’s bulky shape offers a rotationally stable connection to the prosthetic socket. A soft socket made of thermoplastic PE foam that is anatomically formed inside makes up for the undercuts by giving the outside a conical appearance. This makes putting on the prosthesis while seated simple.

The remaining limb musculature stays balanced since the adductors were not transected, and the lengthy laver arm enables powerful prosthesis control. Compared to a transfemoral amputation, there are advantages for both elderly and active individuals. Due to the length of the residual limb, only unique knee joint fabrication can be used. These polycentric joints’ rotation centres are situated close to the anatomical rotation axis.