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Eversion strength analysis of uninjured and functionally unstable ankles
T W Kaminski1, D H Perrin, B M Gansneder
1University of Florida, Gainesville, FL.
Journal of Athletic Training
|March 25, 2006
Summary
Athletes with functional ankle instability (FAI) do not show significant differences in eversion ankle strength compared to healthy individuals. This suggests eversion strength training may not be necessary for FAI rehabilitation.
Area of Science:
- Sports Medicine
- Biomechanics
- Orthopedics
Background:
- Functional ankle instability (FAI) is common in athletes, with peroneal muscle weakness often implicated.
- Traditional rehabilitation focuses on concentric muscle strength, potentially overlooking other factors.
Purpose of the Study:
- To compare concentric and eccentric isokinetic and isometric eversion ankle strength in athletes with unilateral FAI versus controls.
- To investigate potential strength deficits as a cause of FAI.
Main Methods:
- A matched-pairs study comparing 21 athletes with unilateral FAI to 21 healthy controls.
- Isokinetic and isometric measures of ankle eversion strength (peak torque) were assessed at various speeds.
Main Results:
- No significant differences were found in concentric, eccentric, or isometric eversion ankle strength between the FAI group and the control group.
- This indicates eversion strength is not a distinguishing factor for unilateral FAI.
Conclusions:
- The underlying causes of FAI remain unclear.
- Eversion strength deficits do not appear to be a primary cause of unilateral FAI.
- Future research should explore other potential factors like muscle group strength ratios and proprioception.
