EE WAS REMOVING A BELT CLAMP FROM THE BACK OF A P/U BED. THE EE FELT A SHARP PAIN IN HIS SHOULDER WHEN HE LIFTED THE CLAMP AND DROPPED IT. THE EE REPORTED THIS TO HIS SUPERVISOR AND SAID HE TH OUGHT HE WOULD BE OKAY. THE NEXT DAY THE PAIN PERSISTED AND HE WAS TAKEN TO THE DOCTOR. ON MARCH 9 THE EMPLOYEE AGAIN WENT TO THE DOCTOR AND WAS GIVEN A CORTIZONE INJECTION.