EMPLOYEE STEPPED DOWN OFF OF BELTTAIL PIECE AFTER CROSSING. AS HE PUT HIS BODY WEIGHT ON THE LEG THAT WAS ON THE GROUND, HIS KNEE GAVE OUT AND HE FELT PAIN IN THE KNEE. 3 HRS LATER HE REPORTED IT TO THE FOREMAN AND WAS TOLD HE SHOULD HAVE ITCHECKED OUT. HE LEFT THE MINE AT 1 PM. EE STATEDHE DID NOT SLIP OR TRIP.