This is a series of links that Ive been looking at in order to try and figure out what is known about the proper ergonomics and anatomy of a shoe.

The first link is about Ergonomics in general. It is a wikipedia link and its pretty compresensive

http://en.wikipedia.org/wiki/Ergonomics

The next link is about the history of western shoe design from the late reniassance on to the 2000's. It doesnt have much information in the way of pictures, but it looked like it would be a good starting point for some exploration and clues on various types of shoes through history

http://www.footwearhistory.com/elizbg.shtml

This link I thought would be good to check out for the basic anatomy of a human foot.

http://www.eorthopod.com/public/patient_education/6479/foot_anatomy.html

http://www.achillestendon.com/

http://www.eorthopod.com/public/patient_education/6608/ankle_anatomy.html

and here are some images of the human foot anatomy just for our information