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

Abstract

Background and Objectives: Osteoarthritis (OA) also called as Osteoarthrosis or degenerative jointdisease,it is the most common form of common disorder of synovial joint.OA represents a major cause ofmorbidity and disability and as well as it having a significant economic burden on patients and health careresources.Dysfunction of the quadriceps muscle,specially vastus medialis (VM) ,has been hypothesized ascause of OA knee.Various studies evaluating the EMG activity for VMO in straight leg raise,knee extensionand weight bearing exercises like single leg stance to strengthen the quadriceps muscle in patient with OAknee but results are different.So,aim of the study is to compare the activation of VMO by EMG for threedifferent 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 legraise(SLR),2) terminal knee extension with medial rotation of hip ,3) Single leg stance at 30 degrees kneeflexion.Results : ANOVA and Tukey Kramer Multiple Comparison Test were used for statistical analysis.The resultrevealed that there is a significant increase in VMO muscle activity when testing position 1 compared withtesting 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 stanceat 30 degrees knee flexion significantly activate the VMO than straight leg raise (SLR) .The comparison ofthese therapeutic exercises have been advanced to strengthen the quadriceps muscles and hence can be usedas early rehabilitation program in patient with OA knee.