EMPLOYEE WAS WORKING AT THE FILTER PRESS LOADING AND UNLOADING PRESSES. ONE PRESS WAS BEING LOADED WHEN ANOTHER STARTED TO BLOW DOWN. HE SET THE MATERIAL HE WAS LOADING DOWN,S HUT OFF THE OT HER PRESS, AND TURNED TO THE LEFT, IN DOING SO HE HEARD AND FELT HIS LEFT KNEE POP. HE CONTINUED WITH DAILY TASKS. LEFT AT THE END OF THE SHIFT. LATER THAT EVENIGN HIS KNEE BEGAN TO SWELL, H