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The efficacy of electromyographic biofeedback on pain, function, and maximal thickness of vastus medialis oblique muscle in patients with knee osteoarthritis: a randomized clinical trial

Authors Raeissadat SA, Rayegani SM, Sedighipour L, Bossaghzade Z, Abdollahzadeh MH, Nikray R, Mollayi F

Received 29 March 2018

Accepted for publication 7 August 2018

Published 8 November 2018 Volume 2018:11 Pages 2781—2789


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Dr Michael A Überall

Seyed Ahmad Raeissadat,1 Seyed Mansoor Rayegani,2 Leyla Sedighipour,1 Zeynab Bossaghzade,2 Mohamad Hesam Abdollahzadeh,2 Rojin Nikray,2 Fazeleh Mollayi3

1Physical Medicine and Rehabilitation Research Center and Department, Clinical Research Development Center, Shahid Modarres Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; 2Physical Medicine and Rehabilitation Research Center and Department, Shohadaye Tajrish Hospital, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran; 3Department of Sport Sciences, Payame Noor University, Tehran, Iran

Introduction: The aim of this survey was to examine the effect of adding electromyographic biofeedback (EMGBF) to isometric exercise, on pain, function, thickness, and maximal electrical activity in isometric contraction of the vastus medialis oblique (VMO) muscle in patients with knee osteoarthritis (OA).
Methods: In this clinical trial, 46 patients with a diagnosis of knee OA were recruited and assigned to two groups. The case group consisted of 23 patients with EMGBF-associated exercise, and the control group was made up of 23 patients with only isometric exercise. Data were gathered via visual analog scale (VAS) score, the Persian version of the Western Ontario and McMaster Universities Osteoarthritis Index and Lequesne questionnaires, ultrasonography of the VMO, and surface electromyography of this muscle at baseline and at the end of the study. Variables were compared before and after the exercise program in each group and between the two groups.
Results: At the end of the study, there were no significant differences between the two groups regarding measured variables. Only the VAS score was significantly less in the case group. Although all assessed parameters, except for VMO muscle thickness, were found to be improved significantly in each group, the degree of change was not significantly different between the two groups, except for VAS score. VMO muscle thickness did not change significantly after exercise therapy in either of the groups.
Conclusion: Isometric exercises accompanied by EMGBF and the same exercises without biofeedback for 2 months both led to significant improvements in pain and function of patients with knee OA. Real EMGBF was not superior to exercise without biofeedback in any of the measured variables, except for VAS score.

Keywords: knee osteoarthritis, isometric quadriceps exercise, EMG biofeedback

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