More recent trails have conflicting results with one trial showing some benefit and a second trial suggesting a placebo response."The results of this study indicate attenuation of pain sensitivity is greater in response to SMT than the expectation of receiving an SMT". 
- Anonymous (2015), Spinal manipulation (English). Medical Subject Headings. U.S. National Library of Medicine.
- Cherkin DC, Sherman KJ, Deyo RA, Shekelle PG (2003). "A review of the evidence for the effectiveness, safety, and cost of acupuncture, massage therapy, and spinal manipulation for back pain.". Ann Intern Med 138 (11): 898-906. PMID 12779300.
- Bronfort G, Hondras MA, Schulz CA, Evans RL, Long CR, Grimm R (2014). "Spinal manipulation and home exercise with advice for subacute and chronic back-related leg pain: a trial with adaptive allocation.". Ann Intern Med 161 (6): 381-91. DOI:10.7326/M14-0006. PMID 25222385. Research Blogging.
- Bialosky JE, George SZ, Horn ME, Price DD, Staud R, Robinson ME (2013). "Spinal Manipulative Therapy-Specific Changes in Pain Sensitivity in Individuals With Low Back Pain (NCT01168999).". J Pain. DOI:10.1016/j.jpain.2013.10.005. PMID 24361109. Research Blogging.