This results in a beam of light of a sin- gle frequency with little divergence, thought to reduce inflamma- tion and improve circulation (England 1989). Ultrasound is used as a physiotheray intervention for its physiological effects which include argumentation of blood flow, increased capillary perme- ability and tissue metabolism, enhancement of tissue extensibility, elevation of pain threshold, and alteration of neuromuscular ac- tivity leading to muscle relaxation (Downing 1986). Bipolar In- terferential Current is believed to