EMPLOYEE WAS REPAIRING THE LINER IN THE CHUTE. HE WAS HANDED A NEW LINER TO PLACE IN THE CHUTE AND TWISTED HIS BODY AND FELT PAIN IN HIS LEFT KNEE. EMPLOYEE WAS OFF WORK FROM 2/13/04 AND RETU RNED ON 2/16/04. EMPLOYEE DID NOT REPORT IT TO HIS SUPERVISOR UNTIL 2/16/04.