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Isolation of the Vastus Medialis Oblique Muscle During Exercise

Pathokinesiology Laboratory, Rancho Los Amigos Medical Center, Downey, California

* Address correspondence and reprint requests to Edwin Mirzabeigi, MD, 1041 E. Yorba Linda Boulevard, Suite 8, Placentia, CA 92670

The purpose of this study was to selectively challenge the vastus medialis oblique muscle in comparison with the vastus lateralis, the vastus intermedius, and the vastus medialis longus muscles by performing nine sets of strengthening exercises. These knee rehabilitation exercises included isometric knee extension with the hip at neutral, 30° external, and 30° internal rotation; isokinetic knee extension through full range; isokinetic knee extension in the terminal 30° arc; sidelying ipsilateral and contralateral full knee extension; and stand and jump from full squat. Electrical activity of the vastus medialis oblique, the vastus lateralis, the vastus intermedius, and the vastus medialis longus muscles was measured in eight uninjured subjects. Our study showed that isometric exercises in neutral and external rotation of the hip will challenge both the vastus medialis oblique and the vastus lateralis muscles. The results suggest that the electromyographic activity of the vastus medialis oblique muscle was not significantly greater than that of the vastus lateralis, the vastus intermedius, and the vastus medialis longus muscles during the nine sets of exercises. Results suggest that the vastus medialis oblique muscle cannot be significantly isolated during these exercises.

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