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From the Hospital for Special Surgery, New York, New York
* Address correspondence to Robert G. Marx, MD, Hospital for Special Surgery, 535 East 70th Street, New York, NY 10021 (e-mail: marxr{at}hss.edu).
Background: Evidence-based medicine has become a popular topic in academic medicine during the past several decades and more recently in orthopaedics and sports medicine.
Hypothesis: Articles published in The American Journal of Sports Medicine have shown an improvement in methodological quality in 20012003, compared with 19911993.
Study Design: Systematic review.
Methods: All articles published in The American Journal of Sports Medicine during the periods 19911993 and 20012003 were reviewed and classified by type of study. The use of pertinent methodologies such as prospective data collection, randomization, blinding, and controlled studies was noted for each article. The frequency of each article type and the use of evidence-based techniques were compared across study periods.
Results: Case series and descriptive studies decreased during the study period, from 27.4% to 15.3% (P = .00003) and from 11.9% to 5.6% (P = .001), respectively, of articles published. Prospective cohort studies increased from 4.7% to 14.1% (P = .000005), and randomized, prospective clinical trials increased from 2.7% to 5.9% of articles (P = .04). More studies tested an explicit hypothesis (P = .0000002), used prospective data collection (P = .000003), and used blinding (P = .02), and more studies identified a funding source (P = .004).
Conclusions: Overall, there was a shift toward more prospective and randomized research designs published in The American Journal of Sports Medicine during 20012003 compared to 19911993, demonstrating an improvement in the methodological quality of published research.
Key Words: evidence-based medicine evidence-based surgery sports medicine research methodology
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