THE EMPLOYEE STATED HE WAS CLEANING A DITCH ALONG THE RAILROAD TRACK USING THE XL 4100 GRADALL WHEN THE BUCKET CAUGHT ON SOMETHING AND TURNED LOOSE VERY QUICKLY WHICH CAUSED HIS HEAD TO STRIKE THE WINDSHIELD. NOTE: THE EMPLOYEE DID NOT START MISSING ANY WORK UNTIL 5/21/02 DUE TO THIS INJURY.