Forces between segments- inverse dynamic

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Sina Porsa
Posts: 99
Joined: Thu Feb 03, 2011 7:21 pm

Forces between segments- inverse dynamic

Post by Sina Porsa » Tue Jul 12, 2011 11:39 pm

Hi all,
I was wondering why opensim does not report the inter-segment forces when I perform an "Inverse dynamic" or "RRA" on my data? The output *.sto file only has values of torques at each joint, but not the forces.
Regards,
Sina

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Ayman Habib
Posts: 2252
Joined: Fri Apr 01, 2005 12:24 pm

RE: Forces between segments- inverse dynamic

Post by Ayman Habib » Wed Jul 13, 2011 10:53 am

Hi Sina,

The typical definition of Inverse Dynamics does not include solving for inter-segmental forces (e.g. http://en.wikipedia.org/wiki/Inverse_dynamics). There's a separate Analysis that you can perform in OpenSim to compute these forces however, it's called JointReaction Analysis. Please refer to the user guide and/or the Webinar recording at http://opensim.stanford.edu/support/eve ... in-OpenSim

Please let us know if you have any questions.

Best regards,
-Ayman

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