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Objective:

Functional ankle instability (FAI) afflicts many athletes. Several causes of FAI have been implicated, including peroneal muscle weakness. Traditional musculoskeletal rehabilitation programs have focused on concentric muscle strength. The purpose of our study was to compare concentric and eccentric isokinetic and isometric eversion ankle strength measurements between subjects identified as having unilateral FAI and subjects having no history of inversion ankle sprain.

Design and Setting:

Employing a matched-pairs technique, subjects with no history of ankle injury were compared with subjects with unilateral FAI using isokinetic and isometric measures of eversion ankle strength. Strength testing was performed in a sports medicine clinic setting.

Subjects:

Forty-two subjects volunteered for this study: 21 subjects suffered from unilateral FAI (age= 19.3±1.1 years, wt= 84.0±9.5 kg, ht= 181.5±9.2 cm), while …