There are 5 general types of upper limb prostheses:
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Passive prostheses
Body-powered prostheses
Externally powered myoelectric prostheses
Hybrid prostheses
Activity-specific prostheses
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Passive prostheses assist in balance, stabilization of objects (such as holding down paper when writing), and recreational/vocational activities. They look like a natural limb and are the lightest and cheapest, but they do not provide active hand and joint movement.
Body-powered prostheses are the most common, because they tend to be less expensive, more durable, and require less maintenance. A strap-cable system holds the prosthesis on and uses the motion of the person's shoulder blade and upper arm to operate the hook, hand, and/or elbow joint. Some systems use the opposite arm to trigger one particular function; one end of a strap encircles the opposite arm at the armpit, and the other end connects to a cable that controls the terminal device (hook, hand, or specialty device for particular function). People involved in physical labor typically favor this type.
Externally powered myoelectric prostheses provide active hand and joint movement without needing shoulder or body motion. Sensors and other inputs use muscle movement of the residual limb or upper body control electrically powered actuators that provide greater grasp force than body-powered prostheses.
Hybrid prostheses are typically used for higher level upper-limb amputations. They combine specific features of body power and myoelectric power. For example, a body-powered elbow might be combined with an externally powered hand or terminal device.
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