This is due, at least in part, to a lack of available inputs to control more motorized joints. In this study, we created a prosthesis for use in the laboratory with 6 powered DOFs to show that operation of a more highly articulated prosthesis is possible for a person with targeted reinnervation at the shoulder disarticulation level . It has not been possible to meaningfully control this number of DOFs in the past. Analyses of workspace,simultaneous control, and function were performed