Validity of Novel Outcome Measures for Hand Function Performance After Stroke Using Egocentric Video.
Meng-Fen Tsai, Rosalie H Wang, José Zariffa
PMID 36912468WHAT IT FOUND
Hand use ratios from head-mounted cameras correlated strongly with self-reported hand function in stroke survivors.
However, hand role ratios did not correlate with any clinical measures. The camera method validates how much the hand is used, but not how it is used.
Key findings
01Hand use ratios extracted from egocentric video showed significant moderate to strong correlations with the Motor Activity Log, Fugl-Meyer Assessment, and Action Research Arm Test.
02Hand role ratios showed no significant correlation with any upper limb function assessment scores.
03Participants whose more-affected hands were on the dominant side had higher hand use ratios than those whose more-affected hands were on the non-dominant side.
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
The sample size was small (24 participants) and mostly consisted of individuals with mild upper limb impairments, limiting generalizability to those with severe deficits. Hand role ratios were calculated from a small, manually annotated subset of tasks, whereas hand use ratios were calculated from all home recordings, creating a methodological inconsistency. The study was cross-sectional, so it is unknown if these ratios change over time or respond to therapy. Observation bias may have altered participants' natural hand use during recording.
Declared interests
The authors declared no potential conflicts of interest. The study was funded by the Heart and Stroke Foundation of Canada.
The easy way to misread this
Do not assume that egocentric video can objectively measure the quality or type of hand movements. While the hand use ratio was valid, the hand role ratio (distinguishing manipulation from stabilization) showed no correlation with clinical assessments and is not yet a validated measure.