JAMA Network | JAMA | Low Back Pain
This article in the April 24th, 2013 edition of the Journal of the American Medical Association says that Chiropractic treatment can be a benefit for low back pain. This is an amazing statement form this source. They also recommend acupuncture, physical therapy and exercise.
According to the article, surgery is not usually needed and should only be considered if more conservative therapies fail. That's how I practice. Using methods of chiropractic...acutherapy(acupuncture without needles), functional myofascial/fascia treatment, exercise and home advice, it is likely for these patients that their back pain, sciatica and misery can be helped.