WHILE DISMOUNTING RUBBER TIRE DOZER AFTER WORKING ON IT HE STEPPED ON A ROCK ON THE GROUND, FELT PAIN IN RIGHT KNEE. (HE SCHEDULED HIS ANNUAL VACATION FOR DEC. 16 TO DEC. 27, 2002 AND HAD ORTH OSCOPIC SURGERY ON 12/18/02 TO REPAIR A TORN MINISCUP IN HIS RIGHT KNEE. HE RETURNED TO WORK ON HIS REGULAR SCHEDULED WORK DAY WITH A RELEASE FROM HIS DOCTOR).