A comprehensive scheme for the objective upper body assessments of subjects with cerebellar ataxia.
Ha Tran, Khoa D Nguyen, Pubudu N Pathirana and 3 others
PMID 33276783WHAT IT FOUND
A sensor-based system accurately identified cerebellar ataxia and estimated severity.
Using just two tests, finger chase and finger tapping, matched the accuracy of four tests. This suggests clinicians could rely on a shorter, objective assessment without losing diagnostic precision.
Key findings
01The system achieved 96.4% accuracy in distinguishing ataxia patients from controls using features from four upper limb tests.
02Combining only the finger chase and finger tapping tests provided the same high diagnostic accuracy (96.4%) as using all four tests.
03Timing features showed the highest correlation with clinical severity scores, while rhythmicity features showed the lowest.
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
The study included a small number of control participants (14) compared to ataxia participants (41), which may affect the generalizability of the diagnostic accuracy. The participants had progressive neurodegenerative ataxia; the results may not apply to acute ataxia or other causes. The study did not include patients with severe ataxia (SARA upper limb scores above 3 were absent), so the system's performance in severe cases is unknown. The assumption that all cerebellar ataxia presents similarly was noted, but other conditions like vestibular or somatosensory impairments were not controlled for in the analysis.
Declared interests
The study was funded by the National Health and Medical Research Council (AU) and the Commonwealth Scientific and Industrial Research Organisation. No commercial conflicts of interest were declared.
The easy way to misread this
Do not interpret the high diagnostic accuracy as a replacement for clinical judgment. The system was trained and validated on a specific group of patients with progressive neurodegenerative ataxia, and the control group was small. Additionally, the study did not test patients with severe ataxia, so the tool's reliability in those cases is not established.