An assembly of electrically-powered devices that includes a neuromuscular electrical stimulator as an integral part of a therapeutic ultrasound system intended for the simultaneous delivery of ultrasound and electrical energies for physical therapy, typically to help prevent scar tissue formation in healing tissues and to help reduce muscle spasms and pain; it may in addition be capable of delivering either energy alone. The system is designed to produce a rhythmic contraction/release of injured muscles to promote the removal of metabolic by-products while applying ultrasound treatments.