Measurements of Hand Function in Degenerative Cerebellar Disease: A Case-Control Pilot Study.
Scott Barbuto, Stuart Mackenzie, Sheng-Han Kuo and 2 others
PMID 32167956WHAT IT FOUND
The 9-Hole Peg Test performed with the dominant hand best tracked hand function in adults with degenerative cerebellar disease, correlating with ataxia severity across all clinical tests.
Simple reaching kinematics separated patients from healthy controls but failed to track disease severity.
Key findings
01All three clinical hand tests (9HPT, BBT, JTHFT) correlated with ataxia severity, with the 9HPT on the dominant hand showing the highest correlation.
02Kinematic precision measures differentiated healthy controls from mildly and severely ataxic groups, but did not correlate with ataxia severity.
03Standard ataxia scales (SARA) did not detect functional differences in hand sub-scores between mild and severe groups.
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
Very small sample size (14 patients, 14 controls) limits the generalizability of the findings. The study was cross-sectional; it did not follow patients over time to see if these measures detect change as the disease progresses. Participants had various causes of cerebellar degeneration, which may introduce variability in how hand function is affected. The kinematic task was simple, two-dimensional, and supported, which may not reflect complex, gravity-dependent hand movements used in daily life. The SARA hand sub-scores did not differentiate between groups, suggesting the standard clinical scale may lack sensitivity for hand-specific function.
Declared interests
The authors declared no potential conflicts of interest.
The easy way to misread this
Do not assume that simple reaching kinematics can track disease progression in individual patients. While these measures could separate healthy people from those with ataxia, they did not correlate with ataxia severity scores, unlike the 9-Hole Peg Test.