EE WAS WALKING UP AN INCLINED WALKWAY ALONG A CONVEYOR BELT. THE WALKWAY IS METAL GRATING WITH A HANDRAIL, BUT THE EE STATED HIS BOOTS WERE MUDDY CAUSING HIM TO SLIP. HE STATED HE FELT PAIN IN HIS GROIN AREA. NOTE: EE CONTINUED TO WORK UNTIL 8-26-02 WHEN HE FIRST SOUGHT MEDICAL ATTENTION.