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Related Experiment Videos

Contributing factors to chronic ankle instability.

Tricia J Hubbard1, Lauren C Kramer, Craig R Denegar

  • 1Kinesiology, University of North Carolina, Charlotte, NC 28223, USA. thubbar1@uncc.edu

Foot & Ankle International
|March 21, 2007
PubMed
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Chronic ankle instability (CAI) is characterized by recurrent sprains and persistent symptoms. Key predictors include increased ankle laxity, poorer balance, and reduced strength, guiding targeted rehabilitation for prevention.

Area of Science:

  • Sports Medicine
  • Biomechanics
  • Orthopedics

Background:

  • Chronic ankle instability (CAI) results from repetitive ankle sprains and persistent symptoms.
  • Identifying key discriminators between individuals with and without CAI is crucial for effective management.

Purpose of the Study:

  • To identify specific measures that best differentiate individuals with chronic ankle instability (CAI) from healthy controls.
  • To elucidate the mechanical and functional factors contributing to the etiology of CAI.

Main Methods:

  • Thirty subjects with unilateral CAI and matched controls underwent assessments of ankle laxity, hypomobility, balance, strength, and lower extremity alignment.
  • Measures included static and dynamic balance tests, strength testing (peak torque), and laxity assessments on both limbs.

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Main Results:

  • Increased inversion and anterior laxity, more missed balance trials, and lower plantarflexion to dorsiflexion peak torque were significant predictors of CAI.
  • Decreased anterior and posterior medial reach, decreased plantarflexion peak torque, and increased inversion laxity also significantly predicted CAI when comparing limb symmetry indices.

Conclusions:

  • Both mechanical deficits (laxity) and functional impairments (strength, balance) are significant contributors to the development of CAI.
  • Targeted rehabilitation focusing on factors that discriminate between individuals with and without CAI may aid in preventing chronic ankle instability.