Opencap muscle upper limb

[Yingchao You]

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.

[Antoine Falisse]

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

[Cat X]

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!

[Antoine Falisse]

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