EE WAS OPERATING FORKLIFT WHEN ANOTHER FORKLIFT OPERATOR LIFTED HIS MACHINE OFF THE GROUND 6-8"" FROM THE REAR. THE FIRST MACHINE SLIPPED OFF THE FORKS OF THE OTHER LIFT AND DROPPED TO THE GROU ND, CAUSING TRAUMA TO HIS LOWER BACK. AN MRI WAS SCHEDULED FOR 4/29/02. EE FILLED OUT ACCIDENT REPORT ON 4/25/02.