Abstract
Background: In osteoarthritis (OA) of the knee joint, a commonly seen gait alteration is lateral trunk lean gait. Quadratus lumborum (QL) has a role in controlling the pelvis and trunk during walking. This study has analyzed the electromyography (EMG) activity of QL muscle of the affected and nonaffected side during walking in individuals with chronic knee OA. Objectives: The objective of the study was to evaluate the muscle activation of QL in individuals with chronic knee OA during walking. Materials and Methods: EMG device, computer, video camera, abrasive gel (Nuprep gel), T20 paste, and two surface EMG triodes were used to record the QL muscle activity on the affected and nonaffected side. Twenty-seven patients with OA participated in the study. They were made to walk two rounds of 10 m distance and the EMG root mean square (RMS) value was noted down for both sides during the stance phase of the testing limb during walking activity. Results: Comparing the EMG activity of QL of the affected and nonaffected side, during the stance phase of walking, the result was found to be statistically nonsignificant, that is, P > 0.05. Conclusions: The results of this study found no difference in activity of QL in patients with OA between the affected and nonaffected sides.
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