Randomized controlled trials as a source of evidence in rehabilitation: a critical analysis.
Sandra Schmitz, Thorsten Meyer-Feil
PMID 39291951WHAT IT FOUND
RCTs in rehabilitation cannot isolate single causes because treatments are multimodal, personalized, and context-dependent.
Efficacy trials suit short-term component tests, while effectiveness trials better reflect real-world practice. Clinicians should judge RCTs by their purpose: proving a mechanism works or legitimizing a program.
Key findings
01Rehabilitation interventions are complex, multimodal, and personalized, making it difficult to attribute outcomes to a single component or rule out alternative explanations in an RCT.
02Efficacy trials prioritize internal validity by controlling context, while effectiveness trials prioritize external validity by allowing context to vary, reflecting usual clinical care.
03The primary value of an RCT in rehabilitation may be legitimizing interventions for decision-makers rather than identifying causal mechanisms, especially for complex programs.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
This is a theoretical reflection and not a systematic review of evidence. It does not provide new empirical data on patient outcomes. The arguments are based on the authors' interpretation of rehabilitation definitions and existing methodological literature, which may not be universally accepted.
Declared interests
The authors acknowledge inspiration from Cochrane Rehabilitation but do not report specific financial conflicts of interest or funding sources that influenced the conclusions.
The easy way to misread this
Do not interpret this paper as suggesting that RCTs are useless or should be abandoned in rehabilitation. The authors argue that RCTs remain essential but must be chosen and interpreted based on whether the goal is to test a specific component (efficacy) or a whole program (effectiveness), and that their primary function often shifts from causal explanation to legitimation.