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Human foot not as unique as originally thought
Date:8/23/2013

Research at the University of Liverpool has shown that the mechanisms of the human foot are not as unique as originally thought and have much more in common with the flexible feet of other great apes.

Current understanding of the evolution of human walking is based on research from the 1930s, which proposes that human feet function very differently to those of other apes, due to the development of arches in the mid-foot region and the supposed rigidity of that on the outside edge of the foot.

In a study of more than 25,000 human steps made on a pressure-sensitive treadmill at the University's Gait Laboratory, scientists at Liverpool have shown that despite having abandoned life in the trees long ago, our feet have retained a surprising amount of flexibility, the type seen in the feet of other great apes, such as orang-utans and chimpanzees, that have remained largely tree-dwelling.

Professor Robin Crompton, from the University's Institute of Ageing and Chronic Disease, explains: "It has long been assumed that because we possess lateral and medial arches in our feet - the lateral one supposedly being rigid and supported in bone -, that our feet differ markedly to those of our nearest relatives, whose mid-foot is fully flexible and makes regular ground contact.

"This supposed 'uniqueness', however, has never been quantitatively tested. We found that the range of pressures exerted under the human mid-foot, and thus the internal mechanisms that drive them, were highly variable, so much so that they actually overlapped with those made by the great apes."

It has previously been thought that humans who make contact with the ground with the mid-foot region are primarily those that suffer from diabetes or arthritis, both of which can impact on the structure of the feet. Research showed, however, that two thirds of normal healthy subjects produced some footfalls where the mid-foot touches the ground, with no indication
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Contact: Samantha Martin
samantha.martin@liv.ac.uk
44-015-179-42248
University of Liverpool
Source:Eurekalert

Page: 1 2

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