Our expert says:
This may be due to a few factors - the shoes you wear when you run may cause stress on your knees, or the surface you run on may be listing to one side (especially if you run on a tar road) causing stress, or you may have weak thigh muscles that don't support the knees enough. See http://www.coolrunning.com/engine/2/2_5/194.shtml
One has to try and find the cause (if possible see a biokineticist) and treat accordingly.
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