EMPLOYEE WAS PULLING ON A CONCRETE BUCKET TO POSITION IT TO LAND IT ON A SMALL RAILCAR ABOUT 14-14"" HIGH. EE FELT SHRP PAIN IN HIS LOWER BACK. WHEN EE WAS EXAMINED THE DR ADVISED HIM THAT HE H AD NUMEROUS OLD BACK INJURIES IDENTIFIED BY SCARTISSUE. DR PRESCRIBED MUSCLE RELAXER AND SAID HE COULD RETURN TO WORK TOMMOROW IF HE FELT UP TO IT.