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Eccentric muscle strength in functional ankle instability.

Joanne Munn1, David J Beard, Kathryn M Refshauge

  • 1School of Physiotherapy, University of Sydney, Sydney, Australia. J.Munn@cchs.usyd.edu.au

Medicine and Science in Sports and Exercise
|February 6, 2003
PubMed
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Subjects with functional ankle instability showed no evertor strength deficits. However, eccentric inversion strength was reduced in the injured limb, potentially contributing to instability symptoms.

Area of Science:

  • Biomechanics
  • Sports Medicine
  • Musculoskeletal Research

Background:

  • Functional ankle instability (FAI) is a common condition following ankle sprains.
  • It is characterized by a subjective feeling of instability and recurrent giving-way episodes.
  • Understanding the underlying muscle strength deficits is crucial for effective rehabilitation.

Purpose of the Study:

  • To investigate muscle strength in individuals with unilateral FAI.
  • Specifically, to determine if eccentric strength deficits exist in the affected limb.

Main Methods:

  • Isokinetic assessment of ankle invertor and evertor torques.
  • Eccentric and concentric contractions were measured at 60 and 120 degrees/second.
  • Comparison of peak torque values between injured and non-injured limbs in 16 subjects with unilateral FAI.

Related Experiment Videos

Main Results:

  • No significant eccentric or concentric evertor strength deficit was observed in the injured limb.
  • A significant reduction in eccentric inversion strength was found in the injured limb compared to the non-injured limb.

Conclusions:

  • FAI is not associated with evertor strength deficits.
  • Reduced eccentric invertor strength may contribute to FAI symptoms.
  • Weak invertors may impair control of lateral shank displacement, potentially leading to inversion injuries.