**4.1 Body-powered prostheses**

The body-powered prostheses aid the disable person in achieving the functionality lost due to the loss of the limb. The body-powered prostheses also increase the quality of the subject's life by allowing them to perform the activities of daily living (ADL) without the assistance of another human being.

These types of prostheses consist of a tendon or a cable that is attached with the person's body and by pulling that cable, the body-powered prosthesis performs the desired operation [10]. A typical body-powered upper limb prosthesis consists of socket, wrist, control cable, harness, and terminal device as shown in **Figure 5** [11]. The socket is worn on the residual limb, while the harness is worn on the opposite shoulder. To open or close the terminal device, the subject moves his/her shoulder, which results in the movement of harness, which in turn pulls the control cable. Most of the terminal devices in the body-powered prostheses are metal hooks due to the fact that it can withstand high loading and easy to control with a single cablespring mechanism [12].
