EMPLOYEE WENT TO LOOK AT LINE BELT TO SEE IF REPAIRS WERE NEEDED. HE JUMPED OFF THE BELT ONTO THE GROUND. HIS KNEE HURT SOME AT THAT TIME. IT DIDN'T FEEL BAD UNTIL TUES. 7/5/05, WHEN IT STARTED TO SWELL. HIS LEFT KNEE SWELLED & HE COULD NOT HARDLY WALK ON IT.