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DESCRIPTIONMyoelectric prostheses are powered by electric motors
with an external power source. The joint movement of an upper
limb prosthesis (e.g., hand, wrist, and/or elbow) is driven by
microchip-processed electrical activity in the muscles of the
remaining limb stump. Upper limb prostheses are used for
amputations at any level from above the wrist to the shoulder.
The need for a prosthesis can occur for a number of reasons,
including trauma, surgery, or congenital anomalies. The primary
goals of the upper limb prosthesis are to restore natural
appearance and function. Achieving these goals also requires
sufficient comfort and ease of use for continued acceptance by
the wearer. The difficulty of achieving these diverse goals with
an upper arm prosthesis increases as the level of amputation
(hand, wrist, elbow and shoulder), and thus the complexity of
joint movement, increases. Upper limb pros