Which of the following is NOT a component of a body-powered prosthesis?

• A. Socket and cable for locking elbow
• B. Battery-powered motor
• C. Terminal device cable
• D. Forearm

Answer: (B)

Body-powered prostheses rely on a harness and cable system that translates the user’s body movements into movement of the prosthetic limb. The wearer’s shoulder or trunk actions pull on a cable inside the prosthesis, which then drives the elbow mechanism and the terminal device (gripper or hook). The socket provides the interface to the residual limb, the forearm segment houses the mechanical linkages, and a locking elbow can be engaged or released through the cable system to hold or release the elbow position. The terminal device is actuated by its own cable routed through the forearm to open or close.

A battery-powered motor is not part of a body-powered setup. Motors and batteries are characteristic of powered or myoelectric prostheses, where electrical energy and muscle signals drive the movement.