check this one out. Another article showing the positive effects acupuncture on back pain. There have been other studies that have shown same for knee pain also. Consider giving acupuncture a try before proceeding to further more invasive approaches. I have seen near miraculous results with certain conditions using acupuncture in my office. Check out this website to learn a little more about this thousand years old approach to natural health care.
It would be nice if one day when one of these studies is done, they ask a chiropractor, the experts on low back pain, to get involved. I know, I know silly me :) Can you say "economics"