A Study to Compare the Activation of Vastus Medialis Oblique by EMG for three Different Exercises in Patient with Osteoarthrosis of Knee Joint: An Observational Study
Keywords:OA knee, VMO,sEMG, SLR ,Knee extension,One leg standing.
Background and Objectives: Osteoarthritis (OA) also called as Osteoarthrosis or degenerative joint
disease,it is the most common form of common disorder of synovial joint.OA represents a major cause of
morbidity and disability and as well as it having a significant economic burden on patients and health care
resources.Dysfunction of the quadriceps muscle,specially vastus medialis (VM) ,has been hypothesized as
cause of OA knee.Various studies evaluating the EMG activity for VMO in straight leg raise,knee extension
and weight bearing exercises like single leg stance to strengthen the quadriceps muscle in patient with OA
knee but results are different.So,aim of the study is to compare the activation of VMO by EMG for three
different exercises in patients with osteoarthritis of knee joint.
Methods: The study was conducted on 100 patients with OA knee with mean age of 49.36+5.58 (SD years).
EMG activity of VMO was compared during MVIC with 10 RM in three different positions:1)straight leg
raise(SLR),2) terminal knee extension with medial rotation of hip ,3) Single leg stance at 30 degrees knee
Results : ANOVA and Tukey Kramer Multiple Comparison Test were used for statistical analysis.The result
revealed that there is a significant increase in VMO muscle activity when testing position 1 compared with
testing position 2 and 3 but there was no significant difference was found between testing position 2 and 3.
Conclusion: The result showed that terminal knee extension with medial rotation of hip and single leg stance
at 30 degrees knee flexion significantly activate the VMO than straight leg raise (SLR) .The comparison of
these therapeutic exercises have been advanced to strengthen the quadriceps muscles and hence can be used
as early rehabilitation program in patient with OA knee.
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