INJURED WAS PREPARING TO MOUNT EXCAVATOR, AS HE PLACED HIS WEIGHT ON HIS RIGHT FOOT, HE SLIPPED.THIS CAUSED HIS RIGHT KNEE TO TWIST. HE SOUGHT MEDICAL ATTENTION ON SEPT 16, 2000. HE WAS DIAGNO SED WITH A KNEE SPRAIN. HE CONTINUED TO WORK UNTIL NOV 7, 2000, BEFORE BECOMING A LOST TIME ACCIDENT. AN MRI WILL BE PERFORMED TO DETERMINED THENATURE OF THE INJURY.