Daniel Redwood, D.C. Response
The assumption that the sham manipulation in the NEJM study has no effect is just that, an assumption. If minimal-force chiropractic techniques like Toftness or DNFT have some therapeutic effect, then it is entirely possible that the "sham" manipulation in the NEJM study was an accidentally effective treatment, no matter how surprising this may seem. Was any of this discussed by the author of the NEJM study in his analysis of his data? If not, it's a significant oversight. There are many more articles like this in the Problems With Placebo/Shams Page.