Hi,
Do you have experimental markers on the torso of your participant?
If not, the torso will move in the same way as the pelvis segment, which might look strange and explain your observation.

Hi Axel, Each joint has a partent and child frame. If you want to match an OpenSim model with your clinical model you need to account for the offset (if there is one). E.g. the pelvic frame in most clinical models is defined based on the ASIS and PSIS markers which creates an offset around 15 degree...

Hi Todd,
I guess modifying the orientations of the parent/child segments in the additional 'joints' would do the job.
Cheers,
Hans

I had the same or similar problem when I used a model from OpenSim 3.3 in OpenSim 4.0. For some bones the link to the correct vtp files was missing. I copy and pasted the geometry folder from OpenSim 3.3 to the folder in which my model was saved and it worked fine afterwards.

Hello all, I want to change the location of the segment frame relative to the geometry (e.g. bone). In the generic OpenSim model the segment frame of the femur is located at the hip joint center. I built a model based on MRI images and therefore the segment frames are somewhere outside the bone geom...

Hello, I'd like to do some kinematic comparisons between different models and therefore I need to know how OpenSim calculates joint angles. Are the Cardan/Euler angles calculated in an intrinsic way (second and third rotation occur about axes of the rotated coordinate system, same as in the paper fr...