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Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
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Postural Instability in Subjects With Usher Syndrome.

Simona Caldani1,2, Maria Pia Bucci1,2, Maud Tisné1,2

  • 1UMR 1141 Inserm, Robert Debré Hospital, Université de Paris, Paris, France.

Frontiers in Neurology
|August 24, 2019
PubMed
Summary

Usher syndrome patients exhibit poorer postural stability, especially on unstable surfaces. Vestibular impairment significantly impacts balance, with type I patients showing greater instability than type II.

Keywords:
Usher syndromepostural controlproprioceptionrehabilitationvisuo-vestibular inputs

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vestibular System Research

Background:

  • Usher syndrome is a genetic disorder causing vision and hearing loss.
  • Vestibular dysfunction is common in Usher syndrome, impacting balance and spatial orientation.
  • Postural control relies on integrated visual, vestibular, and somatosensory inputs.

Purpose of the Study:

  • To investigate postural control differences between Usher syndrome types and healthy controls.
  • To assess the impact of visual and vestibular impairments on postural stability.
  • To determine if postural measurements can differentiate Usher type I from type II.

Main Methods:

  • Evaluated postural stability in 49 participants (Usher I, Usher II, controls) using a force platform.
  • Assessed balance under varying visual conditions (eyes open, closed, optokinetic stimulation).
  • Measured center of pressure (CoP) displacement and calculated a postural instability index (PII).

Main Results:

  • Usher patients demonstrated significantly greater instability than controls on an unstable platform.
  • Usher type I patients (severe vestibular loss) were more unstable than Usher type II patients (normal vestibular function) on the unstable platform.
  • Vestibular impairment severity correlated with increased CoP displacement surface.

Conclusions:

  • Impaired visual and vestibular inputs contribute to poor postural control in Usher patients.
  • Postural stability assessment on unstable surfaces can differentiate Usher type I from type II.
  • Multisensory evaluation is crucial for developing personalized rehabilitation strategies to enhance quality of life.