Postural stability index is a more valid measure of stability than equilibrium score

Document Type

Article

Publication Date

7-1-2005

Abstract

Researchers, therapists, and physicians often use equilibrium score (ES) from the Sensory Organization Test, a key test in the NeuroCom EquiTest System (a dynamic posturography system) to assess stability. ES reflects the overall coordination of the visual, proprioceptive, and vestibular systems for maintaining standing posture. In our earlier article, we proposed a new measure of anterior-posterior (A-P) postural stability called the Postural Stability Index (PSI), which accounts for more biomechanical aspects than ES. This article showed that PSI provides a clinically important adjunct to ES. In the present article, we show that PSI can provide an acceptable index even if a person falls during the trial, whereas ES assigns a zero score for any fall. We also show that PSI decreases as ankle stiffness increases, which is intuitive, while ES exhibits the opposite behavior. Ankle stiffness is generally recognized as an indicator of postural stability. These results suggest that PSI is a more valid measure of A-P stability than ES.

Identifier

31444446371 (Scopus)

Publication Title

Journal of Rehabilitation Research and Development

External Full Text Location

https://doi.org/10.1682/JRRD.2004.08.0097

e-ISSN

07487711

ISSN

07487711

PubMed ID

16320149

First Page

547

Last Page

555

Issue

4

Volume

42

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