Abstract
This study aimed to identify quantitative biomarkers of motor function for cerebellar ataxia by evaluating gait and postural control using an RGB-depth camera-based motion analysis system. In 28 patients with degenerative cerebellar ataxia and 33 age- and sex-matched healthy controls, motor tasks (short-distance walk, closed feet stance, and stepping in place) were selected from a previously reported protocol, and scanned using Kinect V2 and customized software. The Clinical Assessment Scale for the Assessment and Rating of Ataxia (SARA) was also evaluated. Compared with the normal control group, the cerebellar ataxia group had slower gait speed and shorter step lengths, increased step width, and mediolateral trunk sway in the walk test (all P < 0.001). Lateral sway increased in the stance test in the ataxia group (P < 0.001). When stepping in place, the ataxia group showed higher arrhythmicity of stepping and increased stance time (P < 0.001). In the correlation analyses, the ataxia group showed a positive correlation between the total SARA score and arrhythmicity of stepping in place (r = 0.587, P = 0.001). SARA total score (r = 0.561, P = 0.002) and gait subscore (ρ = 0.556, P = 0.002) correlated with mediolateral truncal sway during walking. These results suggest that the RGB-depth camera-based motion analyses on mediolateral truncal sway during walking and arrhythmicity of stepping in place are useful digital motor biomarkers for the assessment of cerebellar ataxia, and could be utilized in future clinical trials.
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Data Availability
The data that support the findings of this study are available from the corresponding author, upon reasonable request.
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Acknowledgements
We thank all the participants for their contributions to this study. We are also grateful to the staff members of the Division of Rehabilitation Medicine, Chiba University Hospital, for their technical support.
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MS: data acquisition, writing manuscript; SH; project administration, participant administration, data curation, writing manuscript; KO: Data acquisition and analysis, software, editing manuscript; TSH: study design, editing manuscript; MI, MT; data acquisition and curation; RK, AS: participant administration, editing manuscript; MM: project management, editing manuscript; HMR: data curation, software, reviewing manuscript; AUB, AM, FP, SK: supervision and reviewing manuscript.
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This study was approved by the Ethics Committee of the Graduate School of Medicine, Chiba University (approval no. 3174). Written informed consent for participation and publication was obtained.
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KO and AUB are shareholders of Motognosis GmbH and are named inventors of patent applications describing perceptive visual computing for tracking motor dysfunction. HMR was employed at Motognosis GmbH. All the other authors have no conflicts of interest to declare relevant to the content of this article.
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Suzuki, M., Hirano, S., Otte, K. et al. Digital Motor Biomarkers of Cerebellar Ataxia Using an RGB-Depth Camera-Based Motion Analysis System. Cerebellum (2023). https://doi.org/10.1007/s12311-023-01604-7
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DOI: https://doi.org/10.1007/s12311-023-01604-7