Nigral stimulation for freezing of gait: kinematic gait parameters inform optimization of stimulation frequency.
Daniel Weiss, Idil Cebi, Lisanne Dorrmann and 4 others
PMID 40926219WHAT IT FOUND
Adding nigral stimulation to standard subthalamic stimulation did not improve freezing of gait more than subthalamic stimulation alone.
Individual responses varied widely. However, wearable sensors tracking stride length and swing time correlated strongly with clinical improvement, suggesting kinematics can guide personalized programming.
Key findings
01There were no significant differences in freezing of gait scores between standard subthalamic stimulation and any of the combined subthalamic plus nigral stimulation frequencies.
02Improvements in freezing of gait scores correlated strongly with improvements in stride length, swing time, and range of motion at the shank measured by wearable sensors.
03The optimal stimulation setting varied between patients, with some favoring standard subthalamic stimulation and others favoring combined stimulation at different frequencies.
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 very small (ten patients), limiting the power to detect differences between stimulation conditions. The study did not use statistical sample size planning. Impedance changes with frequency could not be measured in real-time, so total electrical energy delivery may have varied slightly between conditions. There was a trend toward worsening performance on the freezing of gait test with repeated assessments, possibly due to fatigue or medication washout effects. Electrode location variability between patients was not analyzed due to the small sample size.
Declared interests
The study was funded by Eberhard Karls Universität Tübingen. No commercial conflicts of interest or specific author disclosures are mentioned in the provided text.
The easy way to misread this
Do not conclude that nigral stimulation is ineffective for freezing of gait. The study found no group-level advantage over standard subthalamic stimulation, but individual responses varied, and the small sample size limits certainty. The strong correlation with kinematic measures suggests that wearable sensors could help identify which patients benefit from specific programming adjustments.
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