Don’t expect glucosamine/chondroitin to treat knee osteoarthritis
Original: eternity4719 · source details
Original author: eternity4719 · Chinese source: · English adaptation: parveen0029. Translation and grade notes ↗
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Cost and benefit at a glance
In plain terms
In a major clinical trial for knee osteoarthritis over 24 weeks, dummy pills alone produced pain relief in 60.1% of patients. Adding glucosamine or chondroitin provided no statistically meaningful improvement beyond that effect. Spending 700–1800 RMB yearly essentially buys you the same expectation effect seen in 60% of people without active ingredients.
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Cost: what it takes
Roughly 2–5 RMB per day, or 700–1800 RMB per year.
Benefit: what the source reports
As noted above, glucosamine and chondroitin showed minimal benefits compared to placebo. The real active drug in the trial, celecoxib, produced a 10.0 percentage point improvement (P=0.008). The perceived value of glucosamine/chondroitin stems from their “cartilage-repair” reputation and the fact that placebo alone helped 60% of patients.
Conditions, limits and disagreements
Controversy: Among participants with severe baseline pain, those taking both supplements saw a 79.2% pain-reduction rate versus 54.3% in the placebo group (P=0.002). However, researchers note this finding was derived post-hoc and should be viewed as a preliminary clue rather than a definitive conclusion. Proven treatments for knee osteoarthritis include weight loss and muscle-strengthening exercises — see Section 2.
Original references
Original bibliographic titles and links are preserved; some titles are in Chinese.
Clegg DO et al. (2006). Glucosamine, chondroitin sulfate, and the two in combination for painful knee osteoarthritis. NEJM. https://doi.org/10.1056/NEJMoa052771
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