06-005 · EVIDENCE A · LOW-RISK READING
Don’t expect glucosamine/chondroitin to treat knee osteoarthritis
不要指望氨糖（葡萄糖胺）/软骨素治膝关节炎
Roughly 2–5 RMB per day, or 700–1800 RMB per year.
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.
A
Move “Don’t expect glucosamine/chondroitin to treat knee osteoarthritis” to Future Me's calendar
The excuse
The routine already works until the day the source says it may not.
What feels good now
Today I keep a few minutes and avoid interrupting my default routine.
What the source says
The source summarizes the return this way: “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.” Evidence grade A. The original states the population, caveats, and sources; this is not a personal forecast.
Open the original entry, check who the evidence applies to, then pick one small step that fits.
THE ENGLISH EDITION
Original recommendation and evidence
5. Don’t expect glucosamine/chondroitin to treat knee osteoarthritis
Cost: Roughly 2–5 RMB per day, or 700–1800 RMB per year.
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.
Benefit: 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.
Evidence grade: A
Sources: Clegg DO et al. (2006). Glucosamine, chondroitin sulfate, and the two in combination for painful knee osteoarthritis. NEJM. <https://doi.org/10.1056/NEJMoa052771>
Notes: 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.
Read the complete Chinese source and notes
5. 不要指望氨糖（葡萄糖胺）/软骨素治膝关节炎
成本: 一天约 2 到 5 元，一年 700 到 1800 元。
说人话: 膝盖有骨关节炎的人吃 24 周假药，也有六成说没那么疼了。吃氨糖或软骨素的人只比这多出四五个百分点，小到可能只是碰巧。一年花七百到一千八，买到的基本就是那六成的心理作用。
收益: GAIT 试验找了 1,583 名膝骨关节炎患者，吃 24 周。吃安慰剂（假药）的人里，也有 60.1% 说疼痛缓解了。氨糖只比它高 3.9 个百分点（P=0.30）。软骨素高 5.3 个百分点（P=0.17）。两样一起吃高 6.5 个百分点（P=0.09）。这几个差距都太小，不能排除只是碰巧。同一个试验里用来做对照的真药塞来昔布，高 10.0 个百分点（P=0.008）。它看起来划算，是因为「补软骨的原料」听起来正好对症，而且光吃假药就有六成人说有效
证据等级: A
来源: Clegg DO et al. (2006). Glucosamine, chondroitin sulfate, and the two in combination for painful knee osteoarthritis. NEJM. <https://doi.org/10.1056/NEJMoa052771>
备注: 争议：同一个试验里，一开始就疼得厉害的那批人，两样一起吃的有效比例是 79.2%，对照组 54.3%（P=0.002）。但作者说这是事后从数据里翻出来的，只能当线索，不能当结论。膝关节炎真正有证据的做法是减重和练肌肉，见第 2 节
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