EE WAS USING A VACUUM TRUCK TO CLEAN PRODUCT FROMT HE FLOOR UNDERNEATH A PRODUCT SILO, AS EE BENT OVER TO MOVE A 6"" VACUUM HOSE, EE FELT MUSLCE PULL IN HIS BACK. EE WAS SENT TO DR AND WAS TREA TED FOR A SACROILIAC STRAIN. EE WAS RELEASED TO RESTRICTED DUTY. HOWEVER THE RESTRICTION WERE SUCH THAT NO VIABLE WORK IS AVAILABEL TO EE LTA.