PERSON WAS USING ""RAIL TYPE"" JACK TO MOVE FRAME WORK FOR DE-WATERING SYSTEM INTO PLACE. WHILE APPLYING PRESSURE ON JACK HANDLE TO WORK THE JACK PERSON FELT SHARP PAIN IN RIGHT ARM. PERSON WENT TO DR., HAD MRI DONE, THEN RETURNED TO DR. ON 9/11/01 AND HAD A CORTIZONE SHOT.