EE REPORTED HE WAS WALKING INTO THE ENTRYWAY OF CLINKER TUNNELS AND SLIPPED ON LOOSE CLINKER, STRAINING HIS RT. KNEE. WAS SENT TO HOSPITAL FOR EXAMINATION, BONE FRACTURE WAS DETERMINED AND HE WAS REFERRED TO IV-ORTHO. HE WORKED LIGHT DUTY 3 DAYS, LOST TIME BEGAN 8/27/04. HE RETURNED TO FULL DUTY ON 10/25/04 AND STARTED MISSING AGAIN 12/20/04 DUE TO PAIN. 2ND SURGERY 12/30/04.