this is a VERY difficult, if not impossible question to answer online. you need to talk to a doctor that can sit down and look at the X-rays at the very least. the best advice i can give you is listen to your doctor, and see a specialist if you can afford it. second best advice, the SECOND he starts feeling any tingling, pins and needles, numbness, or burning of any kind, get him to an ER and be sure to take great care with the back on the way. The CNS cannot repair itself easily and the only thing to do at that point can only be done by doctors
T.B. EMT-B