Article

Some motor impairments, such as decreased reaction of peroneal
muscles, altered kinematics, or poor postural control, have been described in
people with functional ankle instability. Evidence shows a possible relationship
between fibular nerve impairments and functional ankle instability. OBJECTIVE: To
investigate the electrophysiologic excitability of the common fibular nerve, as
measured by strength-duration curves, in subjects with functional ankle
instability compared with a control group without ankle impairment. DESIGN: A
cross-sectional study.
SETTING: University Research laboratory. PARTICIPANTS:
Fifty subjects with functional ankle instability (35 men, 15 women; ages 24.36
+/- 5.01 years) and 63 uninjured control patients (44 men, 19 women; ages 22.67
+/- 4.85 years) were recruited by convenience sampling. INTERVENTIONS: Not
applicable. MAIN OUTCOME MEASURES: Strength-duration curves of the common fibular
nerve were made in all participants. Rheobase, chronaxie, Bawen index,
accommodation index, galvano-tetanic threshold, and intensity thresholds for
different pulse durations were obtained and compared between the 2 groups.
RESULTS: Subjects with functional ankle instability show increased values of
chronaxie (0.58 +/- 0.24 ms versus 0.47 +/- 0.16 ms; P = .004), Bawen index (1.53
+/- 0.24 versus 1.39 +/- 0.21; P = .002), and intensity thresholds for pulse
durations </=2 ms both for rectangular and triangular pulse wave forms. The
accommodation index was smaller in subjects with functional ankle instability
than controls (3.7 +/- 0.72 versus 4.05 +/- 0.98; P = .036). The remaining
parameters did not show significant differences between groups. CONCLUSIONS:
These findings suggest that subjects with functional ankle instability show a
decreased excitability in their common fibular nerve when compared with subjects
without ankle injuries.
CI - Copyright (c) 2016 American Academy of Physical Medicine and Rehabilitation.
Published by Elsevier Inc. All rights reserved.

Langue : ANGLAIS