title: Static and dynamic posturography in patients with vestibular and cerebellar lesions.
abstract: OBJECTIVE
  To assess the diagnostic usefulness of posturography in 2 well-defined patient groups with impaired balance.
  
  
  METHODS
  Ten control subjects, 10 patients with bilateral vestibular loss, and 10 patients with cerebellar atrophy.
  
  
  METHODS
  Amplitude, velocity, and frequency of sway in the anteroposterior and medial-lateral directions on a static platform, on foam, and on a moving platform.
  
  
  RESULTS
  Both patient groups consistently had increased sway compared with controls, particularly when standing on foam or on a moving platform with eyes closed. Sway amplitude and velocity were increased about the same amount. The Romberg ratio (sway with eyes closed/sway with eyes open) did not reliably differentiate patients from controls or the 2 patient groups from each other. Some patients with cerebellar atrophy exhibited a characteristic body tremor at about 3 Hz in the anteroposterior direction.
  
  
  CONCLUSIONS
  Although sway amplitude and velocity were consistently increased in patients with bilateral vestibular loss and patients with cerebellar atrophy, none of the posturography measurements reliably distinguished the 2 patient groups. The finding of increased frequency of sway in the anteroposterior direction in patients with cerebellar atrophy was of limited value since the tremor was visible at the bedside.
authors.affiliation: Department of Neurology, University of California-Los Angeles School of Medicine, 90095-1769, USA. rwbaloh@ucla.edu
authors.forename: R W
authors.initials: RW
authors.lastname: Baloh
authors.forename: K M
authors.initials: KM
authors.lastname: Jacobson
authors.forename: K
authors.initials: K
authors.lastname: Beykirch
authors.forename: V
authors.initials: V
authors.lastname: Honrubia
mesh_terms: D000328:Adult; D001284:Atrophy; D016022:Case-Control Studies; D002531:Cerebellum / Q000473:pathology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009460:Neurologic Examination; D004856:Postural Balance / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D014724:Vestibular Function Tests