EMPLOYEE WENT TO SEE COMPANY PHYSICIAN ON 11/19/02 AND WAS PLACED ON RESTRICTED DUTY. WHEN WALKING TO BOLT TRAILER ACROSS CONCRETE SLAB, EMPLOYEE SLIPPED ON A ROCK, HIS FOOT SLID UNDER THE BOL T TRAILER, HE FELL FORWARD WHICH CAUSED A STRAIN AND CONTUSION TO HIS R-LEG. (ALLEGED)