EE WAS SITTING IN SEAT OF FRONT END LOADER, HAD REMOVED HIS COAT AND WAS TWISTING TO HANG COAT OVER BACK OF SEAT WHEN HE FELT BURNING PAIN IN HIS LOWER BACK. HAD SLIPPED ON ICE WHILE WALKING T O LOADER, BUT DID NOT FALL. (DID NOT SEEK MEDICAL TREATMENT UNTIL 12/19/03).