Construct validity and responsiveness of clinical upper limb measures and sensor-based arm use within the first year after stroke: a longitudinal cohort study.
Johannes Pohl, Geert Verheyden, Jeremia Philipp Oskar Held and 3 others
PMID 39881332WHAT IT FOUND
Clinical scores and real-world arm use measure different things.
A 4-point improvement in motor recovery did not guarantee patients felt better. Use arm use data to see how much patients actually use the arm, not just how well they can move it.
Key findings
01Motor capacity scores (FMA-UE, ARAT) correlated strongly with each other, but only moderately with real-world arm use duration measured by sensors.
02A change of 4 points on the Fugl-Meyer Assessment indicated meaningful improvement for 75% of patients in the early subacute phase, but this did not necessarily match changes in sensor-based arm use.
03Sensor-based arm use metrics showed weak relationships with patient-perceived change, suggesting they capture different aspects of recovery than clinical tests or patient reports.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTs
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What it does not show
Sample size dropped significantly at later time points (e.g., 43 participants at 1 year), potentially affecting stability of estimates. Sensor metrics measure wrist movement and may miss fine hand dexterity or successful completion of tasks. No test-retest reliability was assessed, so minimal detectable change could not be calculated to compare against MIC values. Participants received conventional therapy, so results may not generalize to high-intensity or novel interventions.
Declared interests
Funded by the P & K Pühringer Foundation. No other conflicts declared.
The easy way to misread this
Do not interpret a lack of correlation between clinical score changes and sensor-based arm use changes as a failure of either measure. They assess different constructs: capacity versus real-world performance. A patient can improve their clinical score without increasing their daily arm use, or vice versa.