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A body powered or conventional upper extremity prosthetic device is operated by a harness system. The harness system is controlled by specific body movements. The advantages of a conventional prosthesis is that the heavy duty construction of the device gives it a long life; it offers proprioception; it’s less expensive and lighter in weight than myoelectric devices; and there is a reduced cost and maintenance. 

A Myoelectric upper extremity prosthetic device is powered by a battery system and is controlled by EMG signals generated during muscle contractions. The advantages of a myoelectric prosthesis is that there is an unlimited functional envelope; it offers functional cosmetic restoration; it can increase a person’s grip force to 20-32 lbs; and the harness system is reduced or eliminated, which offers comfort and increased range of motion.