EE WAS HANDING A WORN METAL SCREEN, THAT HAD BEEN CHANGED & CUT IN HALF OUT OF THE BARREL SCREENTO CO-WORKER. THE SURFACE HE WAS STANDING ON IS CURVED, THE NEW PLATE HAD A LIGHT FILM ON IT AND HIS SHOES WERE DAMP. AS HE HANDED THE PLATE OUT HIS RT. FOOT SLIPPED SIDEWAYS. WHEN HIS FOOT STOPPED HIS RT. KNEE BUCKLED AND HE FELT PAIN ON THE SIDE OF HIS KNEE.