 They can be susceptible to water damage and thus great care must be taken to ensure that the prosthesis remains dry.A myoelectric prosthesis uses the electrical tension generated every time a muscle contracts, as information.This tension can be captured from voluntarily contracted muscles by electrodes applied on the skin to control the movements of the prosthesis, such as elbow flexion/extension, wrist supination/pronation (rotation) or opening/closing of the fingers.