WHILE PUTTING KEEPER BOLTS ON CUTTING EDGES OF CAT 16-G EE TWISTED CAUSING PAIN. THE EDGES WERE ALREADY BEING HELD IN PLACE. NO INJURY OCCURED JUST A TWISTING MOTION CAUSED BACK PAIN. EE HAS P REVIOUS HISTORY OF BACK INJURY. HE HAS SEEN A CHIROPRACTOR ON AND OFF FOR 6 YEARS. EE WAS RELEASED TO RETURN WITH NO RESTRICTIONS. NO INJURY-ILLNESS.