Fractal dimension analysis of static stabilometry in Parkinson's disease and spinocerebellar ataxia.
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.
Manabe
Y
Y
Department of Neurology, Okayama University Medical School, Japan. manabe@cc.okayama-u.ac.jp
Honda
E
E
Shiro
Y
Y
Sakai
K
K
Kohira
I
I
Kashihara
K
K
Shohmori
T
T
Abe
K
K
D000368:Aged; D005260:Female; D017709:Fractals; D006801:Humans; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000503:physiopathology*; D011187:Posture / Q000502:physiology; D012016:Reference Values; D020754:Spinocerebellar Ataxias / Q000503:physiopathology*; D014785:Vision, Ocular / Q000502:physiology