Physical Therapy Korea (한국전문물리치료학회지)

Korean Research Society of Physical Therapy (한국전문물리치료학회)
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Effects of Medial, Lateral Wedge and Difference of Quadriceps Angle on Vastus Medialis Oblique/Vastus Lateralis Muscle Activity Ratios

내·외측 Wedge와 넙다리네갈래근 각의 차이가 안쪽빗넓은근/가쪽넓은근 비에 미치는 영향

  • Yoo, Won-Gyu (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University) ;
  • Lee, Hyun-Ju (Dept. of Physical Therapy, Andong Science College) ;
  • Yi, Chung-Hwi (Dept. of Physical Therapy, College of Health Science, Yonsei University, Institute of Health Science, Yonsei University)
  • 유원규 (연세대학교 대학원 재활학과) ;
  • 이현주 (안동과학대학 물리치료과) ;
  • 이충휘 (연세대학교 보건과학대학 물리치료학과 및 보건과학연구소)
  • Received : 2005.04.07
  • Accepted : 2005.04.25
  • Published : 2005.05.21
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Abstract

Patellofemoral pain syndrome (PFPS) is often attributed to malalignment and maltracking of patella within the patellofemoral joint. Most exercise for PFPS has focused on selectively strengthening the vastus medialis oblique muscle (VMO). This study was designed to identify the effect of medial, lateral wedge and difference of Quadriceps angle (Q-angle) on vastus medialis oblique/vastus lateralis muscle (VL) activity ratios. The subjects were twenty young adult males who had not experienced any knee injury. They were asked to perform isometric contraction exercises in three postures using medial and lateral wedge. The EMG activity of the VL and VMO were recorded in three postures by surface electrodes and normalized by %MVC values derived from seated, isometric knee extensions. The normalized EMG activity levels (%MVC) of the VL and VMO for the three postures of the lower extremities were compared using 2-way repeated measures ANOVA with 1 between-subject factor (group), and 1 within-subject factor (wedge). Results of repeated measures of ANOVA's revealed that the medial wedge isometric contraction exercise produced significantly greater EMG activity of VMO/VL ratios in Group I (Q-angle $18^{\circ}$ or less) (p<.05). But, the medial wedge isometric contraction exercise was no significant difference of VMO/VL ratios in Group II (Q-angle $19^{\circ}$ or more) (p>.05). These results have important implications for selective VMO muscle strengthening exercises in PFPS patients.

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