I was thrown off because some of the bone files don't have an actual origin (0,0,0) line, which just meant that their LCS is off the bone. Hi Dann what do you mean by "bone file"? cause I'm searching for such a thing in OpenSim to find the relation between my FEM bone & OpenSim bone to reach the pr...

Hi, Tuhin- 1) How to change the thickness of bone which is a similar case to osteoporosis. There is no concept of bone thickness in OpenSim. The bones you see on screen are for display and guidance only. Often, people will perform an OpenSim simulation to get joint contact and muscles forces then i...

I post this for future reference Bones in vtp format can't be used for any calculation, they're just for visualization. Please see links below https://simtk.org/plugins/phpBB/viewtopicPhpbb.php?f=91&t=11489&p=32096&start=0&view= https://simtk.org/plugins/phpBB/viewtopicPhpbb.php?f=91&t=10644&p=29589...

Hello everyone

I have constructed a patient's femur based on CT scan files, how can I import this bone to OpenSim?

Regards,
Yunus

Hello, The bone geometry is used exclusively for visualization rather than for any computation, so the quality of the meshes has no role to play in modeling of muscles or their attachments (other than eye-balling where the muscles attach). Hope this helps, -Ayman Thanks, Ayman, that was quite helpf...

Femur bone shape in OpenSim (just like other bones) is too coarse and doesn't match a patient-specific CT-based bone model , in detail even when it is scaled. Muscle Force Direction plugin gives you muscle attachment points and lines of action for scaled osim model while neither bone geometry nor mu...

Hello Zeinab
Welcome to OpenSim community!

you can use Muscle Force Direction plugin to extract muscle line of action and attachment points(origin/insertion).
Notice that this plugin only works with OpenSim 3.3 currently.

Best.

The problem is impossible to solve without more information (it's analogous to asking for any two integers that sum to 10). Depending on your research question, you could try assuming that the GRF is evenly split between the two legs if the COP is midway between the feet, 100% applied to a single l...

Hey everybody

Standing with both legs on a force plate gives you a single ground force reaction some where between two soles.
How can I divide this single force to the both legs of my model?
thanks.

You can use the BodyAnalysis, which reports the position and orientation of the body local frames with respect to the ground frame. Otherwise, you can attach markers on the bodies and then get their location in the ground frame (e.g. PointKinematics analysis). If you need to express these points in...