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Knee Function

To the Editor:

Your December 1980 special issue on the knee was super! I would like to make a few minor comments on function that seem to have been overlooked.

During normal gait, after initial contact, the quadriceps femoris muscle acts as a decelerator and the hamstring muscles pull the knee posteriorly into extension, reinforcing the action of the quadriceps femoris muscle as a knee extensor. Because of anterolateral insertions of the hamstring muscles, this co-contraction during terminal extension contributes considerably to lateral stability of the knee. If knee stability is contingent upon a strong contractile mechanism, the muscles in question should be exercised in the manner in which they are used. Inasmuch as the force vector is posterior to the knee during terminal extension, you must place your resistance posterior to the knee with the foot immobile....

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