VEHICLE REAR ENDED CAUSING A RIGHT HAND SPIN RESULTING IN A DRIVER SIDE DOWN VEHICLE LANDING POSITION IN A 4 FOOT DEEP DITCH AT ABOUT 25 MPH. DRIVER SIDE AIR BAG DID NOT DEPLOY AND DRIVER RECEIVED SHOULDER INJURY AND HEAD HIT ON DRIVER SIDE PILLAR POST BETWEEN FRONT AND REAR LEFT HAND DOORS. UPDATED IVOQ 04/24/12 *TR