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Related Concept Videos

Ankle Joint01:10

Ankle Joint

The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...

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Related Experiment Video

Updated: Jun 18, 2026

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability
07:52

Evaluating Postural Control and Lower-extremity Muscle Activation in Individuals with Chronic Ankle Instability

Published on: September 18, 2020

Concentric evertor strength differences and functional ankle instability: a meta-analysis.

Brent L Arnold1, Shelley W Linens, Sarah J de la Motte

  • 1Virginia Commonwealth University, 1015 West Main Street, PO Box, 842020, Richmond, VA 23284-2020, USA. barnold@vcu.edu

Journal of Athletic Training
|November 14, 2009
PubMed
Summary
This summary is machine-generated.

Functional ankle instability (FAI) is associated with weaker concentric evertor muscles. This systematic review suggests a link between muscle weakness and FAI, impacting clinical assessments.

Keywords:
ankle forceankle sprainsankle torqueankle weaknesschronic ankle instabilityisokinetic assessment

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Area of Science:

  • Biomechanics
  • Musculoskeletal Research
  • Sports Medicine

Background:

  • Functional ankle instability (FAI) is a common condition following ankle sprains.
  • Concentric evertor muscle weakness is a potential contributing factor to FAI.
  • Understanding this relationship is crucial for effective rehabilitation and prevention strategies.

Purpose of the Study:

  • To systematically review and synthesize evidence on the association between concentric evertor muscle weakness and functional ankle instability.
  • To determine if individuals with FAI exhibit quantifiable differences in evertor muscle strength compared to stable ankles.

Main Methods:

  • Comprehensive electronic literature search (PubMed, CINAHL, SPORTDiscus) up to November 2007.
  • Inclusion of peer-reviewed studies, dissertations, and theses reporting strength outcomes for FAI and control groups.
  • Independent data extraction and quality assessment, focusing on concentric eversion strength at fast and slow velocities.

Main Results:

  • Ankles with FAI demonstrated significantly weaker concentric evertor muscles compared to stable ankles (Standardized Mean Difference = 0.224, P < .001).
  • No significant difference in weakness was observed between fast and slow contraction velocities.
  • The small effect size suggests a need to re-evaluate current clinical methods for measuring ankle strength.

Conclusions:

  • Concentric evertor muscle weakness is indeed associated with functional ankle instability.
  • The findings highlight the importance of assessing evertor strength in individuals with FAI.
  • Further research may be needed to refine clinical strength assessment protocols for ankle instability.