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Sources of bias in reviews of spinal manipulation for back pain

Journal: Wiener Klinische Wochenschrift Date: 2005/05, 117(9-10):Pages: 333-341. doi: Subito , type of study: systematic review

Full text    (https://link.springer.com/article/10.1007/s00508-005-0355-6)

Keywords:

back pain [493]
chiropractic [96]
OMT [2951]
osteopathic manipulative treatment [2973]
systematic review [297]

Abstract:

The effectiveness of spinal manipulation as a treatment for back pain remains uncertain and controversial. This is because of methodological weakness in many of the published clinical trials and also because of markedly opposing interpretations of the primary data by different reviewers. We have systematically assessed a representative sample of recent reviews on this topic. Reviews were included in the analysis if they were published between 1993 and March 2004, were listed in PubMed with an abstract and categorised as a review or meta-analysis, and were written in English. They were also required to present the evidence from at least two referenced clinical trials of spinal manipulation for back pain and to reach a conclusion about the effectiveness of the intervention. Each review was evaluated for methodological quality. Twenty-nine reviews met the inclusion criteria. Sixteen reached an overall positive conclusion, 7 a negative conclusion and 6 a neutral conclusion regarding therapeutic effectiveness. There were statistically significant pairwise correlations between each of the three factors: direction of conclusion, methodological quality and authorship by osteopaths or chiropracters. This indicates an association between authorship by osteopaths or chiropractors and low methodological quality and positive conclusion. We conclude that the outcomes of reviews of this subject are strongly influenced by both scientific rigour and profession of authors. The effectiveness of spinal manipulation for back pain is less certain than many reviews suggest; most high quality reviews reach negative conclusions.


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