Advice to strengthen the quadriceps for knee osteoarthritis is given constantly and followed rarely, in part because it is not a prescription. A patient told to do some exercises has been given no way to know whether they are doing enough, and no way to tell whether it has failed.
Today's dose-response analysis offers usable figures. Function improves most at around 2,600 repetitions of moderate-intensity isotonic exercise accumulated over the programme, pain continues improving at higher volumes, and strength gains level off around 1,600. Translating that into a weekly plan gives a patient something checkable: a number of sets, a number of sessions, and an endpoint at which to review.
Two qualifications belong in the same breath. Centre-based programmes outperformed home-based ones, so where supervision is available it is worth the referral. And the certainty of evidence is low, so present these as a reasonable starting structure to be adjusted, not as a threshold that must be hit.
- Convert advice into a countable prescription: sets, sessions, review date
- About 2,600 moderate-intensity repetitions for peak functional gain
- Refer to supervised programmes where available — they worked better
- Low certainty: a starting structure to adjust, not a target to enforce
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