EMPLOYEE WAS SETTING UP THE TRANSIT IN THE 2 RT SOUTH SECTION OF THE MINE WHEN HE FELT SOMETHING GIVE WAY IN HIS BACK. EMPLOYEE WORKED REMAINDER OF SHIFT. EMPLOYEE HAD DR'S APPT 11/15/05 AND WAS PRESCRIBED MEDICATION. HE WORKED REMAINDER OF DAY FROM HOME OFFICE AND RETURNED TO NORMAL DUTIES ON 11/16/05.