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Unloading reactions in functional ankle instability.

Marcio J Santos1, Hongzeng Liu, Wen Liu

  • 1Department of Physical Therapy and Rehabilitation Sciences, University of Kansas Medical Center, Kansas City, KS, USA. santosmj@uic.edu

Gait & Posture
|September 25, 2007
PubMed
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Individuals with functional ankle instability exhibit quicker and more pronounced unloading reactions. This heightened response may explain the feeling of an ankle "giving way" after severe sprains.

Area of Science:

  • Biomechanics
  • Neuromuscular control
  • Sports medicine

Background:

  • Ankle sprains are common injuries, with functional ankle instability (FAI) often following severe sprains.
  • Unloading reactions, a protective mechanism, have been proposed as a strategy to prevent ankle sprains.

Purpose of the Study:

  • To investigate unloading reactions in individuals with functional ankle instability (FAI).
  • To understand the neuromuscular response to ankle perturbation in FAI.

Main Methods:

  • 20 individuals with FAI and 18 healthy controls participated.
  • Nociceptive electrical stimulation was applied to the lateral ankle during standing.
  • Ground reaction forces, lower extremity kinematics, and EMG activity were recorded.

Related Experiment Videos

Main Results:

  • Individuals with FAI showed significantly faster and increased body weight unloading responses.
  • This hyper-reactive unloading suggests an altered protective mechanism in FAI.

Conclusions:

  • The observed hyper-reactivity in unloading responses may contribute to the sensation of ankle instability.
  • Understanding these reactions can inform rehabilitation strategies for individuals with FAI.