The heel is the key that turns on the machine. At heel strike the calcaneous (heel bone) must dorsiflex, evert and externally rotate in order to allow the rest of the leg and body to properly react. The motion of the heel bone allows the lower leg to internally rotate then the upper leg to internally rotate and allows for several other reactions up the chain. This internal rotation of the leg "turns on" or stimulates the powerful butt muscles to contract which in turn slows down the internal rotation and eventually moves the leg into external rotation for proper lift "off"
This is a very important concept that must be addressed with all foot/leg/ and spine injuries. If it is not addressed many injuries will heal improperly or the person will be set up for the same injuries over and over again.
It's know coincidence that the term "Achilles Heel" is so well known. Proper heel function is essential for proper walking and running biomechanics.
Kevin Colling, DC
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