Hi everyone, I have been running into an issue when trying to implement the BushingForce element at intervertebral joints. Currently, the bushing forces are located at the same location and orientation as the joint center between two vertebrae. When only flexion-extension is prescribed (other DOF lo...

Dear Dimitar, Thank you for your reply. I think you have pointed me in the right direction. I have checked the passive forces and normalized fiber lengths after running static optimization. I see that there are a few lower extremity muscles and also a few in the iliocostalis that have passive muscle...

Hi everyone, I'm working on a full body back-lifting model and have run into some trouble during Static Optimization. It's my understanding that coordinate actuators placed at the joints should not be used until the muscles cannot stabilize the model. However, there are many muscles in my model that...

I had a similar problem with a model that I am working on as well. Have you looked at how ground-pelvis joint is defined? The model you are working with may only allow for rotation in the flexion extension direction. If the parent axis of the joint is placed anteriorly to the actual body of the pelv...

Hi everyone, I am working on a full-body model and am interested in estimating the joint forces and moments during a lifting motion. I am attempting to run Static Optimization and then Joint Reaction Analysis and have had some success but have run into an issue. From what I understand, the gndpelvis...

Hello, After successfully (although somewhat slowly) running Static Optimization on my model, I have realized that the generated "states" output motion is different that the input motion from Inverse Kinematics. It appears the coordinates defined with respect to time, as shown below, remain locked a...

Thank you. I believe this is the correct function, but due to my unfamiliarity with the syntax I am not sure exactly what (const SimTK::Transform & aTransform) is asking for. For most classes I have been able to sort through and figure out the required inputs but not so much for this one.

Hi all, I am relatively new to OpenSim Scripting in Matlab and am having a trouble figuring out how to edit the <transform> array - within the <GeometrySet> class shown at the bottom - via Matlab. I have tried getting and setting the values using the GeometrySet and/or DisplayGeometry classes but wi...