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Where the foot rolls from the outside to inside, is the normal shock-absorbing
mechanism in running. But when it is excessive, to the point where the arch
is flat or the heel is tilted over, it causes overuse problems of the foot and
leg. The knee is often forced into weaker position on the medial side, and out
of alignment. As the weight of the body comes down on the improperly aligned knee,
problems arise.
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