A list of all the inputs used to control the 6 DOFs is presented in table 1. The 4 targeted muscle reinnervation myoelectric sites were used to control the hand and elbow as described above. EMG from the subject’s residual latissimus dorsi muscle was used to control external (lateral) humeral rotation and the EMG from his residual deltoid muscle was used to control internal (medial) humeral rotation. A rocker switch was positioned superior to the lateral acromion within the socket to control shoulder movements. Contact with the anterior aspect of the rocker flexed the arm at the shoulder joint and contact with the posterior aspect of the rocker extended the shoulder. A force sensing resistor (a thin, 2-cm diameter Touch Pada) was mounted in the socket anterior to the acromioclavicular joint so that contact with this force sensing resistor using shoulder protraction could control wrist flexion: a soft and slow push on the force sensing resistor flexed the wrist, whereas a hard and fast push extended the wrist. Similarly, a force sensing resistor was mounted at the same level in the posterior aspect of the socket so that shoulder retraction could control wrist rotation; a soft and slow push pronated the wrist, whereas a fast and hard push supinated the wrist. The program for the Boston Digital Arm was modified to accept the additional electromyographic control signal inputs, accept the force sensing resistor input, and allow simultaneous operation of all DOFs