Article

Despite a history of a lateral ankle sprain, some individuals (copers) return to high-level activities (i.e. jumping, pivoting) without recurrent injury or loss of function while others develop chronic ankle instability (CAI). Understanding
the differences between these groups may provide insight into the mechanisms of CAI.
The objectives of this investigation were to: (1) compare traditional center of pressure [COP], time-to-boundary [TTB], and center of pressure-center of mass
[COP-COM] moment arm measures of postural control among controls, established
copers, and subjects with CAI and (2) determine the accuracy of these postural
control measures at discriminating between established copers and subjects with
CAI using receiving operating characteristic curves. 48 subjects (control=16,
coper=16, CAI=16) completed two, 30-s trials of single-leg stance on a force
plate with their eyes open. Coper and CAI subjects stood on their involved limb
while controls stood on a matched limb. The results indicated that mediolateral
(p<0.01) and anteroposterior (p<0.01) COP velocity was greater in individuals
with CAI relative to both copers and controls. Similarly, the peak COP-COM moment
arm in the anteroposterior direction (p<0.01) and the resultant mean COP-COM
moment arm (p<0.01) were increased in individuals with CAI relative to copers.
These measures also reached asymptotic significance (p<0.05) indicating that they
successfully discriminated between established copers and individuals with CAI.
CI - Copyright 2010 Elsevier B.V. All rights reserved.

Langue : ANGLAIS