ON HIS LAST SHIFT ROTATION, THE EMPLOYEE REACHED OUT TO PULL A JACKLEG DRILL TOWARDS HIM THAT WAS LEANING ON THE RIB. HE EXPERIENCED PAIN IN HIS RIGHT SHOULDER. ON JAN 23 A PHYSICIAN DIAGNOSED A MUSCLE STRAIN AND RESTRICTED HIS ARM USE. HE DID NOT RETURN TO HIS SCHEDULED SHIFT ON JAN 25, 2002.