Retrieving Muscle Forces and Directions

[Griffin Holt]

Hello,

I'm trying to represent muscle forces as vectors in MATLAB, and to do this I need help retrieving three things from my OpenSim file.

First, I need to get the coordinate of a specific muscles attachment onto a bone.
Second, I need to get the magnitude of the force that is acting on the bone from the muscle at this location.
Third, I need to get the direction of this force.

Any help would be greatly appreciated.

[Thomas Uchida]

Please see this plugin: https://simtk.org/projects/force_direction. Some relevant information can also be found in other Forum topics (e.g., topic 11324, viewtopicPhpbb.php?f=91&t=11324).

[Griffin Holt]

Hey Thomas,

Thanks for the reply. Unfortunately, we are using OS 4.0, and do not have a compatible model for the 3.3 plugin. Is there any way to do this without the plugin?

[Griffin Holt]

I might be able to use OpenSim 3.3 after all, but I cannot find a download link to OpenSim 3.3. Could you help me out?

[Ayman Habib]

Hello,

On the downloads page, there's a link to previous releases, expanding that will show the downloads for version 3.3 and older. Keep in mind though that version 3.3 was supported only on Windows.

Best of luck,
-Ayman