Chiropractic outperforms drugs (NSAIDs) and Acupuncture.

A pilot study involving 77 patient with chronic spinal pain received either nonsteroidal anti-inflammatory drugs (NSAIDs), acupuncture, or spinal manipulation. After 30 days, spinal manipulation was the only intervention that achieved statistically significant improvements according to outcome assessments.
Journal of Manipulative Physiologic Therapeutics, July 1999