Having worked in the medical field for many years, I can say that you will usually get that response from any MD when asking their thoughts on chiro's. The reason for that is they feel it's voodoo medicine. Plus if you go to them they don't make any money.
Now if you can find an orthopedic DO you will be in business. Bets of both worlds. However they are hard to find, and if you question if they are real doctors they are. They have the same amount of schooling and take the same boards as an MD.
I think there is a fine balance that can occur between Eastern/Western Medicine. That being said, I had a similar issue except in my cervical spine, numb arm and hand at times, shooting lightening pain, not able to turn my head left to right. Surgery is not something I was willing to even consider, since back surgeries will never leave you like new.
My Dr's the first go round thought I was being a sissy, the second go round gave me muscle relaxers, NSAIDS, and Pain medications. So I was gorked for a week, and the pain only slightly improved, went back to doing my old yoga/pilates stretches, twice a day, and eventually it went away.
Third time, I was willing to try a chiroprachter, and man let me tell you, those guys are magicians. He did massage therapy, and TENS therapy, and then would do an adjustment, provided me with exercises to improve the surrounding muscles, and it went away. I did use muscle relaxers at bedtime when this flare up occured.
Which the Chiro was agreeable to.
It hasn't been a big issue for me since that time. I get tight, and feel it coming on, and start my exercises again, and it gets better.
So will seeing a Chiro heal him, no not in the long run, but you bet your bottom they will make him better for a while. Then give him exercises to improve the strength of surrounding muscles. If he is heavy/has any extra weight on his front (ie a belly) he needs to work very hard to get rid of it. I have seen people eliminate their back issues with weight loss. The constant strain goes away things tend to stay where they belong.
So surgery is always an option, but I would encourage you to make it the last one, when all other modalities have failed.
Anyway, that's my 2 cents.