New York Times gives a quick overview here of back pain including data on surgery failure and side effects of medication. Basically it goes back to simple exercise, being active and most will heal on its own. We should be there for the rest.
Allen Besselink here hereoffers great insight on back pain and benefits of Direct Access to treat it. I agree with every bit.
Clinical guidelines via Annals of Internal Medicine here herefor your source on what physicians are taught. Good for new therapists out there and even for your patients.