residual limb

After an amputation, the part of the limb that remains is called the residual limb (older texts and patients themselves often say 'stump'). It is far more than a leftover: it is the foundation on which the entire prosthesis will be built, the surface that must press against a socket all day, and the engine of muscle power that will drive the artificial limb. How good this residual limb is largely decides how well a prosthesis will work.

An ideal residual limb has a few clear features: it is a good length (long enough to give the socket leverage, not so long that tissue is poorly supplied); its end is rounded and well padded with muscle and soft tissue, not bony and sharp; its scar is healed, smooth, and not stuck down over bone; its skin is intact and tolerant of pressure; the nearby joints move freely without contracture; and its shape has matured into a gently tapered cone after the early swelling has settled. Surgeons work hard at the operation, and therapists at limb shaping afterwards, to achieve exactly this.

Because skin and soft tissue that were never meant to bear weight now must, the residual limb needs lifelong attention. Its volume changes — it shrinks over the first months and fluctuates daily with activity and fluid — which is why sockets are adjusted and refitted over time. Daily skin checks catch redness and blisters before they become breakdown. Many problems an amputee faces (pain, a loose socket, sores) trace back to the condition and care of the residual limb, making it the true center of gravity of amputee rehabilitation.