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I am focuing on the muscle forces analysis of upper limb. However, the default model of opencap don't has muscle of upper limb.

So I am wondering that how can I can add muscles on the scaled model?

Thanks very much.

Hey,

The best approach would probably be to 1) add muscles to the unscaled model and 2) rescale the model. These OpenCap files might be helpful:

1) You can find the unscaled model here: https://github.com/stanfordnmbl/opencap ... dHand.osim
2) You can find the marker set here: https://github.com/stanfordnmbl/opencap ... menter.xml
3) You can find the setup file for scaling here: https://github.com/stanfordnmbl/opencap ... rms_KA.xml
4) When you download OpenCap data, you get the marker data from the neutral pose under MarkerData/neutral.trc

There are existing OpenSim models with arm muscles, so you leverage what is existing already to add muscles to the upper body.

Let us know for questions,
Best,

Antoine

How would one add muscles to the upper body of the unscaled version of the LaiUlrich2022.osim model?

In particular, I am integrate the existing Upper Extremity Kinematic Model (https://simtk.org/projects/up-ext-model), which contains a .jnt and .msl file. Thank you!

Hi, this question is better suited for the OpenSim forum: indexPhpbb.php?f=91
Thanks, Antoine