Relationship between knee alignment and the electromyographic activity of
quadriceps muscles in patients with knee osteoarthritis |
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| Authors: | Seong Hoon Lim Bo Young Hong Jee Hae Oh Jong In Lee |
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| Institution: | 1) Department of Rehabilitation Medicine, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Republic of Korea;2) Department of Rehabilitation Medicine, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Republic of Korea |
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| Abstract: | Purpose] We evaluated the relationship between knee alignment and the electromyographic
(EMG) activity of the vastus medialis (VM) to the vastus lateralis (VL) muscles in
patients with knee osteoarthritis (OA) in a cross-sectional study. Subjects and Methods]
Forty subjects with knee OA were assessed by anatomic radiographic knee alignment and the
VM/VL ratio was calculated. Surface EMG from both the VM and VL muscles were evaluated
during maximal isometric contraction at 60° knee flexion. Simultaneously, peak quadriceps
torque was assessed using an isokinetic dynamometer. Subjects were categorized into low,
moderate, and high varus groups according to knee malalignment. The peak quadriceps torque
and VM/VL ratio across groups, and their relationships with varus malalignment were
analyzed. Results] All subjects had medial compartment OA and the VM/VL ratio of all
subjects was 1.31 ± 0.28 (mean ± SD). There were no significant differences in the peak
quadriceps torque or VM/VL ratios across the groups nor were there any significant
relationships with varus malalignment. Conclusion] The VM/VL ratio and peak quadriceps
torque were not associated with the severity of knee varus malalignment.Key words: Malalignment, Knee, Quadriceps |
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