EE WAS ASSISTING ON VULCANIZING RIA CONVEYOR AT CRUSH/CONVEY DIVISION. IT WAS WORKING OFF A PLATFORM HE TURNED TO STEP DOWN OFF PLATFORM AND HE FELT HIS KNEE POP AND CAUSAL IMMEDIATE PAIN. HE HAD MADE THIS MOVE SEVERAL TIMES DURING THE DAY.DR DETERMINED POSSIBLE LIGAMENT DAMAGE TO LEFT KNEE.