simtk.org

Hey
I want to estimate ground reaction forces, moments, and contact points between ground and feet during the gait, of which I have only marker data. What's the best way of estimating ground reaction forces, assuming that the masses of bodies are taken from opensim generic human model (scaled, of course).

I have downloaded contact_forces plugin (https://simtk.org/projects/statopt-contact), but to be honest I don't know how to use it properly.

any help would be great

In this case, you will have to model the interaction between the ground and foot. In OpenSim this is typically done using elastic foundation contact models. You will have to mimic the experimental marker trajectories and both predict the ground reaction forces in a forward driven manner. You might want to have a look at Moco and predictive simulation:

https://simtk-confluence.stanford.edu/d ... o+Workshop

https://simtk.org/projects/3dpredictsim/