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There seems to be a large amount of disparity concerning the amount of eversion available at the subtalar joint. i have read of as much as 30 degrees is available in a normal subtalar joint. There is sure to be a fair amount of variability among individuals, but 30 degrees is surely way to much, maybe this is a typo, most orthopedic literature claims 5 degrees is normal, this seems pretty close to the mark, although i think it maybe a little skinny, i would think 5 to 10 degrees would be pretty close but i could be wrong. I would like to know What other people think is he normal range.
I would also like to know how much of this motion is used during walking, i know that these are very basic questions but i hope to get some kind of consensus so i can put my mind to rest on the subject.
Think about it intuitively --- when the rearfoot hits the ground the leg needs to internally rotate, so all that is needed at the STJ is sufficent eversion to accomodate that .... probably only 4 or so degrees. SO, the normal range if you spend your life walking in straight line on a hard surface is 4 degrees.
However, if you want to turn a corner, then you going to need more than that.
If you walk over uneven ground, then you are going to need more
If you are going to play tennis, then you need even more.
If you are a competitive high jumper, then you need even more (thing about the fosby flop take off position).
Therefore, there is no such thing as a 'true' normal range of eversion - what is needed is a range that is specific to each individual and that is activity dependant.
__________________
Craig Payne
Department of Podiatry
La Trobe University
Melbourne, Australia http://www.latrobe.edu.au/podiatry
__________________________________________________ ___________________________________ God put me on this earth to accomplish a certain number of things - right now I am so far behind, I will never die.
The views expressed above are those of the author and not that of La Trobe University This is where I am, where are you?
STJ eversion range of motion
Linear Mode
