- Design
- Bayesian network meta-analysis of randomised trials
- Population
- 35 RCTs, 3,808 patients with knee osteoarthritis
- Primary outcome
- Pain, function and quality of life
- Effect
- Combined short-term exercise: pain SMD −0.94; function SMD −0.59 (low certainty)
This Bayesian network meta-analysis pooled 35 randomised trials (3,808 patients) with knee osteoarthritis, comparing aerobic, resistance and combined exercise over the short term (12 weeks or less) and longer term.
All forms of exercise improved pain, function and quality of life. Short-term combined aerobic and resistance exercise ranked highest for pain (SMD −0.94), function (SMD −0.59) and quality of life (SMD 0.66). Longer-term aerobic exercise also helped function. Certainty was low to very low throughout, and evidence on long-term programmes was limited.
Guidelines already place exercise first for knee osteoarthritis. This analysis supports prescribing a programme that mixes walking or cycling with strengthening, rather than one or the other. The practical challenge is adherence beyond the first three months.
- Prescribe a combined programme of aerobic activity and lower-limb strengthening for knee osteoarthritis
- Aim for a structured block of about 12 weeks, then plan how to sustain it
- Choose low-impact aerobic options such as walking, cycling or water exercise
- Use exercise before or alongside injections and analgesics, not after they fail
- Review adherence at follow-up; benefit depends on continuing
Why it matters
Gives a concrete exercise prescription rather than a general instruction to 'exercise more'.
Don't overread it
Low-certainty evidence; the ranking among exercise types is less secure than the overall benefit of exercise.
The statistics, in plain English
A standardised mean difference of −0.94 is a large effect on pain by usual conventions. But certainty was rated low, often because trials were small or unblinded, so the true effect is probably smaller. Rankings in network meta-analyses can shift as more trials are added.
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