EE WAS TRYING TO OPEN STARTER CABINET DOOR. THERE WAS A BUILD UP OF CEMENT AROUND DOOR. HE PULLED ON DOOR, IT WAS STUCK. CLEANED SOME OF THE BUILDUP FROM DOOR. EE PULLED AGAIN AND DOOR CAME OP EN UNEXPECTEDLY. EE FELT A STRAIN IN LOWER BACK RESULTING IN A DIAGNOSIS OF BACK STRAIN AND SPRAIN.