EMPLOYEE WAS WASHING A HAUL TRUCK ON THE WASH RACK. HE SLIPPED IN WATER AND LOST HIS BALANCE. HIS LEGS WENT OUT FROM UNDER HIM IN A SPLITTING MOTION. HIS RIGHT LEG TOOK MOST OF HIS WEIGHT PUTT ING PRESSURE AND TWISTING HIS RIGHT KNEE. HE BEGAN TO FEEL PAIN AND SWELLING IN HIS RIGHT KNEE.