Well, that is very interesting.
There is also the fact that as we age the quads and the hamstrings become out of balance.
My chiro who reset my knee, suggested specific stretches, to balance the tension on the knee and keep it in place. These stretches worked for me.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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