EE WAS PULLING ON A PIPE WRENCH AND FELT PAIN IN BACK. THIS EE HAD RECENT BACK SURGERY. HE WAS SEEN IN COMPANY DISPENSARY ON THE DATE OF THE INCIDENT. HE LATER HAD AN MRI AND WAS GIVEN PHYSICA L THERAPY AND MISSED WORK FOR THIS TREATMENT. FMC BECAME AWARE OF THIS TREATMENT AND DAYS AWAY FROM WORK 3/6/03. THIS HAS BEEN DIAGNOSED AS A CTD & IS NOT CAUSED BY AN ACUTE EVENT.