Socket Design - Through knee

In the case of a disarticulation amputation, which is where the actual knee joint has been separated, several advantages are offered to the amputee. This operation offers a better suspension of the prosthesis, it is more comfortable to walk, the patient has better control over the prosthesis and enjoys a faster rehabilitation. In short, a through the knee amputation makes a perfect suspension system for a prosthesis.

Unlike an above the knee amputation where the weight of the prosthesis is supported by the buttocks through the Ischeal Tuberosity, a through the knee amputation allows a prosthesis to be designed that clings to the femoral condyles, so that the weight of the prosthesis is distributed around the remains of the knee joint. The extra length afforded by a through the knee amputation gives the amputee far better leverage, and suspension of the socket is greatly improved – the bigger the femoral condyles the better, since the socket takes hold of the central part of the condyles, getting a good grip to preclude the socket from slipping off.

In a case where the condyles are not so prominent and the outer part of the remaining joint is of the same size as or smaller than the rest of the limb, a seal in liner is used in order to create an excellent suction suspension. A custom made silicone liner can also be made from a cast of your stump. This is extremely comfortable, gives a good suspension of the prosthesis and lasts a long time.