Hypertrophy of the Vastus Medialis in Knee Extension

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Abstract
The inability of a patient to complete full knee extension following trauma or surgery to the knee, with an apparently normal quadriceps mechanism other than an atrophied vastus medialis muscle, strongly suggests the importance of the vastus medialis in completing terminal, extension of the knee. We hypothesized that, if a normal knee were restricted from completing the last 15 degrees of knee extension in a progressive resistive exercise program, the vastus medialis muscle would fail to hypertrophy. An experimental design was established with one group of subjects completing full extension of the knee, the other being limited from the last 15 degrees of knee extension. An analysis of variance of the difference between the two means was significant, relative to hypertrophy, at the .01 level of confidence. The findings appear to be important for the rehabilitation of the knee.

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