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Isokinetic rotator muscles fatigue in glenohumeral joint instability before and after Latarjet surgery A pilot prospective study

Authors

  • P. Edouard,

    Corresponding author
    1. Department of Physical Medicine and Rehabilitation, University Hospital Saint-Étienne, Saint-Étienne, France
    2. Laboratory of Exercise Physiology (LPE EA 4338), University of Lyon, Saint-Étienne, France
    • Department of Clinical and Exercise Physiology, University Hospital Saint-Étienne, Saint-Étienne, France
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  • C. Bankolé,

    1. Department of Clinical and Exercise Physiology, University Hospital Saint-Étienne, Saint-Étienne, France
    2. Laboratory of Exercise Physiology (LPE EA 4338), University of Lyon, Saint-Étienne, France
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  • P. Calmels,

    1. Department of Physical Medicine and Rehabilitation, University Hospital Saint-Étienne, Saint-Étienne, France
    2. Laboratory of Exercise Physiology (LPE EA 4338), University of Lyon, Saint-Étienne, France
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  • L. Beguin,

    1. Department of Orthopedics Surgery, Mutualiste Clinic, Saint-Etienne, France
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  • F. Degache

    1. Department of Physiology, Faculty of Biology and Medicine, Institute of Sport Sciences, University of Lausanne, Lausanne, Switzerland
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Corresponding author: Pascal Edouard, MD, MSc, Department of Clinical and Exercise Physiology, Sports Medicine Unity, LPE EA 4338, Bellevue Hospital, University Hospital of Saint-Etienne, 42 055 Saint-Etienne cedex 2, France. Tel: +33 674 574 691, Fax: +33 477 127 772, E-mail: pascal.edouard42@gmail.com

Abstract

We aimed to analyze the changes in isokinetic internal (IR) and external (ER) rotator muscles fatigue (a) in patients with non-operated recurrent anterior instability, and (b) before and after shoulder surgical stabilization with the Bristow–Latarjet procedure. Thirty-seven patients with non-operated unilateral recurrent anterior post-traumatic instability (NG) were compared with 12 healthy subjects [control group (CG)]. Twenty patients with operated recurrent anterior instability group (OG) underwent isokinetic evaluation before and 3, 6, and 21 months after Bristow–Latarjet surgery. IR and ER muscles strength was evaluated with Con-Trex® dynamometer, with subjects seated and at a 45° shoulder abduction angle in scapular plane. IR and ER muscle fatigue was determined after 10 concentric repetitions at 180°·s−1 through the fatigue index, the percent decrease in performance (DP), and the slope of peak torque decrease. There were no differences in rotator muscles fatigue between NG and CG. In OG, 3 months post-surgery, IR DP of operated shoulder was significantly (P < 0.001) higher than presurgery and 6 and 21 months post-surgery. Rotator muscles fatigability was not associated with recurrent anterior instability. After surgical stabilization, there was a significantly higher IR fatigability in the operated shoulder 3 months post-surgery, followed by recovery evidenced 6 months post-surgery and long-term maintenance over 21 months.

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