Most patients with below knee amputations have very good functional outcomes with the ability to play sport, run and swim with few problems. Above knee amputations are more variable and will depend to a certain extent upon the remaining length of the femur. The ideal amputation is 15cm above knee and amputees at this level will usually be provided with an artificial limb which will allow them to walk normally and, in some instances play sports. Amputations through the upper leg, through the hip joint or hindquarter amputations are less satisfactory and some patients will find that they prefer not to wear an artificial limb as they are more mobile with crutches. Endoprostheses are often used in limb-sparing surgery for bone tumours.
Some people have no problems with their endoprosthesis.
However, there are potential long-term problems, these will vary from person to person. Like any other prosthesis the tumour endoprosthesis can have problems with wear. In the case of a knee amputation there is usually a hinge necessary to compensate for muscle and ligament resection. The axis is under stress and may have to be revised after wear. Therefore, after 5 to 10 years a rebrushing of polyethylene parts can be necessary.