Effect of glucosamine and chondroitin sulfate in symptomatic knee osteoarthritis: a systematic review and meta-analysis of randomized placebo-controlled trials
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Although glucosamine and chondroitin sulfate have showed beneficial effects on joint tissues in osteoarthritis (OA), their therapeutic use in the clinical setting is still debatable. Hence, a systematic review and meta-analysis of randomized placebo-controlled trials was conducted to investigate the efficacy of glucosamine and chondroitin sulfate on knee OA symptoms. Medline, SCOPUS, Web of Science, and Google Scholar databases were searched for randomized placebo-controlled trials evaluating the effect of orally administered glucosamine and/or chondroitin sulfate on OA symptoms using the Western Ontario and McMaster Universities Osteoarthritis index (WOMAC) and/or the Visual Analog Scale (VAS). Meta-analysis was conducted using a random-effects model and generic inverse-variance method. Heterogeneity was tested using the I2 statistic index. Treatments with glucosamine and chondroitin were found to significantly reduce pain in VAS [weighted mean difference (WMD) − 7.41 mm, 95% CI − 14.31, − 0.51, p = 0.04 and WMD − 8.35 mm, 95% CI − 11.84, − 4.85, p < 0.00001, respectively]. Their combination did not show this behavior (WMD − 0.28 mm, 95% CI − 8.87, 8.32, p = 0.95). None of the glucosamine, chondroitin or their combination had a significant positive effect on the total WOMAC index and its subscores. Oral supplementation with glucosamine or chondroitin sulfate reduces pain in knee OA. However, there is no additional effect using both therapeutic agents in combination for the management of symptomatic knee OA.
KeywordsGlucosamine Chondroitin sulfate Osteoarthritis WOMAC Visual analog scale Meta-analysis
English editing was performed by Dr. Sergio Lozano (member of the American Translators Association and the American Medical Writers Association).
MSM conceptualized and designed the study, carried out the statistical analyses and interpretation of data, drafted the initial manuscript, and approved the final version as submitted. ASG contributed to conception, critically reviewed the manuscript and approved the final version as submitted. FVC contributed to conception, critically reviewed the manuscript and approved the final version as submitted. CAAO contributed to conception, critically reviewed the manuscript and approved the final version as submitted. VMPM contributed to conception, critically reviewed the manuscript and approved the final version as submitted. LESM contributed to conception and study design, carried out the statistical analyses and interpretation of data, drafted the manuscript, critically revised the manuscript, and gave final approval.
Compliance with ethical standards
Conflict of interest
Authors declare that they have no conflict of interest.
Research involving human participants and/or animals
This article does not contain any studies with human participants performed by any of the authors.
Informed consent is not applicable in this meta-analysis.
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