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Christopher Johnston
07-22-1997, 10:47 PM
Dear listers,
I would appreciate help in a problem we have with our horse data. I
understand that horses may not be the may source of information, but I think
the problem may be similar in humans.

During the propulsion phase of the stance the foot or hoof of the horse
rotates ca. 2cm into a compliant surface. What would I expect to be the
difference in movement of the horse on a hard surface? No answer yet.
I have tried to search for references on this in the human literature but
have not been successful, can anyone help me or have a guestimate on these
questions?

Can the foot in humans rotate into a surface?
Would we expect a greater ability to create a propulsive force?
How might this change stride length and stance time?
What might happen to the moment about the foot joint and knee joint?

My guestimate is the following:
The foot will rotate in compliant surfaces and create a greater propulsive
force. The time of contact of the foot will increase and the net moment
about the foot joint will shift in time due to the greater horizontal
componant.
Am I totally wrong....?

Thanks for the help
Chris Johnston
Christopher Johnston DVM
Equine Biomechanics Laboratory
Department of Anatomy and Histology
Faculty of Veterinary Medicine
Swedish University of Agricultural Sciences
750 05 Uppsala, Sweden
Tel +46-18672147
Fax +46-18672852
EMail Christopher.Johnston@ah.slu.se