WHILE DRIVING 45MPH STEERING WHEEL CAME OFF & FELL INTO DRIVER'S LAP. NO VEHICLE CONTROL. WENT UP SMALL EMBANKMENT. HIT BARBED WIRE FENCE AND LANDED IN A DITCH. UPON IMPACT, AIR BAGS DID NOT DEPLOY. DRIVER'S BACK & SHOULDER WERE INJURED. EMERGENCY ROOM TREATMENT & RELEASE. *AK