I am trying to find the center of the elbow joint. I was thinking about putting three markers around the joint and calculating the center like that. If I am understanding it correctly, in order for OpenSim to do inverse dynamics, it has to know where the center of the joint is. So, it has to track t...

Hello all,

Is there a way to export the location coordinates of a joint's center in OpenSim during a motion?

Thank you,
Matthew

While using the Upper Dynamic Extremity Model, I have gotten the constraint violation value down to around 0 with an external load applied. However, while I am doing a curl, the results say that the tricep is producing a force, around 40 newtons while doing this motion. The bicep muscles are produci...

Thank you for the reply. Yes and I have now successfully scaled and ran IK and ID with success with my own motion capture data on the arm26 model. However, I would like to use the Upper Extremity Dynamic Model. I have tried running the same trial on the Dynamic model with no success. Even after lock...

Hello, I am new to Opensim, and I am trying to model the upper extremity while doing a curl using the Arm26 model. Specifically, I want to see the different joint torques and muscle forces with respect to different external loads applied to the hand. I have Vicon motion capture data while doing the ...

Hello, I am using the Arm26 model to simulate a curl while holding a dumbbell. I have taken .trc files from Vicon Motion Capture Lab while doing the exercise and have successfully completed the scaling and Inverse Kinematics. However, I am having trouble computing the muscle forces. I have been usin...

Is there anywhere to download Opensim 3.1? I am trying to use the Upper Extremity Dynamic Model and it is not loading in Opensim 3.2.