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  • Hi Eric;

    Thanks for the response.  By retrograde motion I mean tracking movement contrary to momentum by way of gait line graphings of center of pressure.  For instance, if one landed on the forefoot or midfoot, then settled back on the heel while momuntum (and the body itself) was striding forward, this would appear to create shear at the ankle joint as the foot motion is going backward while the body is moving forward.  I have tracked this with forefoot strikers while running and in oblique walking such as a chef would do in a commercial kitchen.  Are you familiar with any studies dealing with these type of scenarios?


    Best Regards,   Jay

  • Quote:

    Shear is the sliding movement or the attempt at a sliding movement of one part relative to another.   Ground shear will be transmitted to the body through the ankle.   Ground shear will be measured in the form of A-P or Med Lat forces.  A force plate that measures horizontal forces will give you the ground shear.


    I'm not sure what you mean by retrograde motion.   Why do you ask?  

    David Winter wrote several articles on the kinetics of gait.   They are very helpful in understanding how gait is powered.  Reading those articles may help you understand what you want to know.



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