AS EMPLOYEE TRIED TO MOVE A 12' PIECE OF PIPE HIS RIGHT FOOT SLIPPED IN THE MUD. HE FELT PAIN IN HIS KNEE BUT DID NOT FEEL THAT IT WAS SEVERE ENOUGH FOR TREATMENT. ON 8/9/00 HE REQUESTED TO SEE A DOCTOR AS THE PAIN HAD NOT SUBSIDED. THE DOCTOR EXAMINED HIM AND RELEASED HIS TO WORK WITH RESTRICTIONS. HE WAS EXAMINED AGAIN 8/16/00 & RELEASED.