Reliability and Validity of a New Diagnostic Device for Quantifying Hemiparetic Arm Impairments: An Exploratory Study.
Levinia Lara Van der Velden, Joyce Lisanne Benner, Bram Onneweer and 4 others
PMID 35362087WHAT IT FOUND
A new robotic device reliably measures elbow strength, spasticity, and joint stiffness in stroke and CP patients.
It matches clinical tests well for these areas. However, it is less accurate for measuring abnormal movement synergy, especially in adults with CP.
Key findings
01The device showed excellent test-retest reliability for muscle strength, spasticity, and viscoelasticity, with Intraclass Correlation Coefficients (ICC) above 0.90.
02The device's spasticity measurements correlated well with the Modified Tardieu Scale in both stroke and CP patients.
03Reliability and validity for measuring synergy were lower, with the device failing to distinguish CP patients from healthy controls on this specific outcome.
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 study included a small number of participants, particularly in the stroke group (n=9). Patients with severe range of motion restrictions or weakness could not use the device, limiting its application to those with moderate impairment. The measurements are more time-consuming and costly than standard clinical tools. Synergy measurements were unreliable, especially for adults with CP, likely due to compensation strategies and lack of variability in that group.
The easy way to misread this
Do not assume the device is ready for clinical use in all areas. While it is excellent for strength and spasticity, it is currently too unreliable to accurately measure movement synergy, particularly in adults with cerebral palsy.