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Effects of EMG-Biofeedback Training on Functional Ability and Q-angle in Patellofemoral Pain Syndrome
J Kor Soc Phys Ther 2014;26(2):68-73
Published online April 30, 2014
© 2014 The Korean Society of Physical Therapy.

Seung-Kyu Park1, Jae-Young Kang2

1Department of Physical Therapy, Sehan University, 2Department of Physical Therapy, Graduate School, Sehan University
Received March 17, 2014; Revised April 8, 2014; Accepted April 9, 2014.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Purpose: The purpose of this study was to investigate the effect of closed kinetic chain exercise using EMG-biofeedback for selective training of the vastus medialis oblique on functional ability and Q-angle in subjects with patellofemoral pain syndrome.
Methods: Thirty participants who met the criteria were included in this study. Participants were randomly allocated to the control group (Group Ⅰ, n=10), closed kinetic chain exercise group (Group Ⅱ, n=10), and closed kinetic chain exercise using EMGbiofeedback group (Group Ⅲ, n=10). Intervention was performed in three groups, three times per week, for a period of six weeks. Kujala patellofemoral score and Q-angle were measured before and after the experiment.
Results: Some significant differences in kujala patellofemoral score were observed in group Ⅱ and group Ⅲ, compared with group Ⅰ (p<0.01). There was no significant difference on in Q-angle at knee flexion angle 0˚. However, some significant differences in Q-angle at knee flexion 60˚ were observed in group Ⅲ, compared with group Ⅰ (p<0.01).
Conclusion: Closed kinetic chain exercise using EMG-biofeedback that provides real-time biometric information on selected muscles in order to increase the efficiency of treatment may be helpful in improvement of functional ability and Q-angle in patellofemoral pain syndrome.
Keywords : Electromyographic biofeedback, Functional ability, Q-angle, Patellofemoral pain syndrome

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