EE WAS STANDING NEAR THE TOP OF A 16' STEP LADDER SWINGING A 3 LB HAMMER TRYING TO LOOSEN A PVC FITTING WHEN LADDER WOBBLED CAUSING HIS BACK TO TWIST. THIS REPORT IS BEING FILED DUE TO PHYSICA L THERAPY BEING STARTED ON APRIL 10, 03 AND TO CONTINUE FOR AT LEAST TWO WEEKS.