Article

Postural control deficits have been identified among individuals with chronic
ankle instability (CAI) compared to healthy controls. Although deficits in static
balance have previously been reported using center of pressure (COP) and, more
recently, time to boundary (TTB) measures, the underlying mechanism behind these
deficits warrants further investigation. It is unclear if there are differences
in the spatial distribution of COP and TTB minima data points under the foot. Our
purpose was to determine if there are differences in the location of the
distribution of the COP and the TTB minima data points between groups with and
without CAI. Fifty healthy and 61 CAI subjects participated in this case-control
study. The subjects performed three successful 10-s trials of quiet single limb
stance on a force plate with eyes-open and -closed conditions. Results showed
that during eyes-open trials, the CAI group exhibited more COP and TTB minima
data points on the anterolateral aspect of the foot compared to controls.
With eyes-closed single limb balance, the CAI group demonstrated significantly more
COP and TTB minima data points anterior to the horizontal midline of the foot
compared to controls. Overall, the CAI group showed a greater anterior
displacement of COP and TTB minima during single limb static stance compared to
controls. This alteration may result from the CAI subjects adopting a more
dorsiflexed position in an effort to keep the ankle in a more stable, closed pack
position and limiting the available degrees of freedom in the distal lower extremity.
CI - Copyright (c) 2011 Elsevier B.V. All rights reserved.

Langue : ANGLAIS