EMPLOYEE BENT OVER TO PICK UP A CHAIN FALL TO HAND TO A COWORKER. WHEN HIS BACK GAVE OUT, CAUSING HIM TO DROP CHAIN FALL. EE INDICATED HE THOUGHT HE HAD AGGRAVATED A PREVIOUS INJURY HE HAD IN THE SAME LOCATION OF HIS BACK ON 7-1-00, BUT NOW IDICATES A NEW INJURY AFTER PHYSICIAN VISIT ON 11-25-02.