Fractal dimension analysis of static stabilometry in Parkinson's disease and spinocerebellar ataxia. |
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| Authors: | Y Manabe E Honda Y Shiro K Sakai I Kohira K Kashihara T Shohmori K Abe |
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| Affiliation: | Department of Neurology, Okayama University Medical School, Japan. manabe@cc.okayama-u.ac.jp |
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| Abstract: | The static stabilometry patterns associated with Parkinson's disease (PD, n = 15) and spinocerebellar ataxia (SCA, n = 15) were compared with those of normal control (n = 15) by measuring the fractal dimensions. Fractal dimensions were estimated using the modified pixel dilation (mPD) method. The fractal dimensions with closed eyes showed a significant correlation with Environmental area for SCA group (p < 0.05). The fractal dimension for SCA group was significantly higher with closed eyes than that with open eyes (p < 0.05). The fractal dimension with closed eyes was significantly higher in PD and SCA groups than that in normal group (p < 0.05). The fractal dimension with closed eyes was higher when the clinical stage was more severe with PD and SCA group while Environmental and Longitude/Environmental areas were not. These findings suggest that the fractal dimension is more sensitive than traditional stabilometric analysis in an evaluation of postural instability in PD and SCA. |
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