Fig. 1.

Common designs of upper extremity prostheses for the transradial amputation. a Body-powered design. This figure-of-eight harness anchors the prosthesis to the contralateral axilla. A combination of scapular abduction and/or glenohumeral flexion pulls the cable to open the terminal device, while relaxation allows it to passively close. The quick-disconnect wrist unit allows the user to easily interchange terminal devices for varying activities. b Myoelectric design. The particular limb is designed for suspension with a silicone liner and lanyard and has electrodes embedded in the prosthesis for EMG control. No external harness is needed. Note the cosmetic “skin” over the hand which gives the prosthesis a more aesthetic appearance. c Modular socket design. This prefabricated design can be used when a simple and durable prosthesis is needed such as in dirty or wet environments. The socket fitting is user-adjustable and the terminal device can be interchanged