Highlights
- •Subjects with CAI present postural control dysfunction in both injured and uninjured limbs;
- •In the support limb there is a bilateral decrease of tibialis anterior compensatory adjustments;
- •In the perturbed limb there is a bilateral increase of peroneus brevis compensatory adjustments.
Abstract
Background
To evaluate the magnitude of bilateral compensatory postural adjustments in response
to a unilateral sudden inversion perturbation in subjects with chronic ankle instability.
Methods
24 athletes with chronic ankle instability (14 with functional ankle instability,
10 with mechanical ankle instability) and twenty controls participated in this study.
The bilateral electromyography of ankle muscles was collected during a unilateral
sudden ankle inversion to assess the magnitude of subcortical and voluntary compensatory
postural adjustments in both the perturbed and the contralateral limb (support limb).
Findings
In the support position, compared to the control group, the group with functional
ankle instability presented decreased compensatory postural adjustments of the tibialis
anterior in both the injured and the uninjured limbs in the support position and of
the soleus in the uninjured limb. In the side of the perturbation, participants with
functional ankle instability presented decreased soleus compensatory postural adjustments
in the uninjured limb when compared to the control group. Increased values of soleus
and peroneal brevis compensatory postural adjustments were observed in the group with
mechanical instability when compared to the control group and to the group with functional
ankle instability.
Interpretation
Subjects with functional ankle instability present bilateral impairment of compensatory
postural adjustments of the tibialis anterior in a support position and of the soleus
of the uninjured limb regardless of the position. Subjects with mechanical instability
present bilateral increase of these adjustments in the peroneal brevis regardless
of the position and in the soleus muscle in the side of the perturbation.
Keywords
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Article info
Publication history
Published online: June 25, 2018
Accepted:
June 23,
2018
Received:
October 9,
2017
Identification
Copyright
© 2018 Elsevier Ltd. All rights reserved.
