Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21934
Title: Eccentric muscle strength in functional ankle instability
Authors: Munn, J
Beard, DJ
Refshauge, KM
Lee, RYW
Keywords: Ankle sprain
Eversion
Inversion
Muscle imbalance
Issue Date: 2003
Publisher: Lippincott Williams & Wilkins
Source: Medicine and science in sports and exercise, 2003, v. 35, no. 2, p. 245-250 How to cite?
Journal: Medicine and science in sports and exercise 
Abstract: Purpose: To investigate muscle strength in subjects with unilateral functional ankle instability, with the specific aim of determining whether eccentric strength deficits exist. Methods: Isokinetic invertor and evertor torques were assessed eccentrically and concentrically at speeds of 60 and 120°.s-1 in 16 subjects with unilateral ankle instability. Absolute peak torque values were compared between the injured and noninjured limbs to determine whether strength deficits existed. Results: No eccentric or concentric evertor strength deficit was found in the injured limb. Interestingly, for the injured limb, a significant interaction effect was found whereby eccentric inversion strength was reduced. Conclusion: Functional ankle instability is not associated with deficits in evertor strength. Deficits in eccentric invertor strength were found, and this may contribute to the symptoms of functional ankle instability. Weak invertors may contribute to functional ankle instability because of a reduced ability to assist in controlling lateral displacement of the shank over the weight-bearing foot. Excess lateral postural sway outside of the base of support results in the foot's medial border rising from the floor once the limits of closed chain eversion is reached, which may result in the foot being forced into rapid inversion.
URI: http://hdl.handle.net/10397/21934
ISSN: 0195-9131
EISSN: 1530-0315
DOI: 10.1249/01.MSS.0000048724.74659.9F
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