We divide by 2 because we are estimating the vertebral and not the joint load. So, we take the average of the superior and inferior joint forces to estimate the vertebral force (what is between the 2 joints).
Jake Banks

Sorry, we do and have not used the Gait Extraction Toolbox. So, I don't believe we can help you. We use the standard c3dexport Matlab script that is (or at least used to be) provided as an example with OpenSim. I would suggest you post something to the general OpenSim Forum, otherwise maybe try the ...

I'm not familiar with that error. I'm guessing it has less to do about our model and more about how you have either installed OpenSim and/or are using a Tool. I suggest you review your procedures and then if your still having this error, post to the main OpenSim forum. Sorry I can't be of more help/...

Ken, Thanks for your kind words and interest in our model. Unfortunately, we don't have an 'easy' solution for you... if we did, we would have added the arm muscles already! That said, it isn't an insurmountable task. One would just do what we did with the lower limb... find an applicable OpenSim Up...

At the very least, I would start there as you know that model works. If you get that working in MOCO, then maybe try to get it working in our model.
Jake Banks

Thanks for your interest in the our model. We have not done too much with simulations. However, I know the basics. While the link you supplied is a good start, that was done prior to the new OpenSim Tool MOCO. You would be much better off using it: https://simtk-confluence.stanford.edu:8443/display/...

Hmmm... Unfortunately, I (and really 'we') don't have a lot of experience using the forward dynamics tool with our model. So, I can't say that I am that familiar with this particular error. However, I have a few ideas of what may be the problem: - That muscle tendon actuator attaches to the scapula....

We, at present, have no plans to add those joints (plural!). I would not suspect that adding those joints (plural!) would greatly impact the thoracolumbar spine model validation. However, it would depend on the number of muscles that span the c1-c7 joints and also <c7 levels. But I would claim nothi...

After you call "import org.opensim.modeling.*" Go with: ModelVisualizer.addDirToGeometrySearchPaths('Fullpath'); It is our experience that this will need to be added to all (sub)function that call the model. FYI: Since it is user dependent, you want to make sure others in your lab are aware of the p...

First off, thank you Pavlos, Ayman, and John for your replies. They were/are greatly appreciated. Second, sorry for my delayed response. Thankfully, since last week, we have sort of have 'resolved'/found work arounds for memory bleeding. Note: Pavlos, we already (previously) had several subfunctions...