TRAVELING HWY 70 E BETWEEN SAINT AUGUSTINE PASS AND AGUIRRE SPRINGS TURNOFF, COMING FROM LAS CRUCES, NM. HAD JUST PULLED BACK INTO TRAFFIC AFTER SWITCHING FROM A 5'9'" DRIVER TO 4'9" DRIVER. THE SEAT MEMORIES WERE PROGRAMMED FOR BOTH DRIVERS, BUT DID NOT WORK. THE SHORT DRIVER ADJUSTED SEATS AND MIRRORS, NOTICED THAT THE ELECTRIC CONTROLS SEEMED TO BE SLUGGISH. AFTER PULLING BACK INTO TRAFFIC, THE SEAT WAS A LITTLE TOO CLOSE TO STEERING WHEEL. DRIVER TRIED TO NUDGE SEAT BACK, BUT CONTROL DID NOT WORK. DRIVER TRIED TO ADJUST SEAT TO TILT BACKWARD, BUT THE SEAT MOVED ALL THE WAY BACK. WHEN TRYING TO BRING SEAT BACK UP, THE CONTROL STUCK IN THE TILT FORWARD POSITION AND FOLDED DRIVER IN SEAT TO WHERE DRIVER COULD NO LONGER SEE ABOVE THE DASH (40-45 DEGREE SHARP ANGLE OF SEAT) . PASSENGER NAVIGATED THE VEHICLE ONTO MEDIAN. DRIVER THEN PULLED CONTROL WITH BOTH HANDS, WHEN IT FINALLY CAME UNSTUCK. THE INJURY TO DRIVER WAS A SORE LOWER BACK LASTING SEVERAL DAYS AFTER EXPERIENCING GREAT PRESSURE FROM SEAT BACK ON LUMBAR REGION. (MIGHT HAVE BEEN MORE OR LESS SEVERE WITH LARGER DRIVER) LOCAL FORD DEALER WILL SERVICE VEHICLE ON 20 JUNE 2013. *TR