Standing Neutral Pose Problem in Non Ambulatory Subject

[Arafat Rahman]

Hi,
I am trying to use opencap to collect data from some spinal muscular atrophy (SMA) and duchenne muscular dystrophy (DMD) patients. But they are non ambulatory patients. They can not stand for neutral pose collection. They always sit in the wheelchair. Also, I am interested in upper limb motions. So, I don't need the lower limb muscle analysis.

Is it possible to collect neutral pose while they are sitting or is there any way to skip the neutral pose collection step? Thanks in advance for your answer.

[Scott Uhlrich]

Hi Arafat,

Yes, you can try running the neutral pose when seated, the scaled model will likely not be great since we assume standing-like hip-knee-ankle angles, but it should process. If it processes, you can then proceed with the collection and reprocess the data locally after the fact (https://github.com/stanfordnmbl/opencap ... essions.py). In reprocessing, you'd want to change the scaling setup file to remove all of the IKCoordinateTasks (https://github.com/stanfordnmbl/opencap ... A.xml#L620). Once you reprocess the neutral trial (and visualize that it looks representative in the webapp), you'd want to reprocess all of the dynamic trials as well.

Scott

[Arafat Rahman]

I tried to record a neutral pose while sitting. But every time some errors are coming. Sometimes it says failed to record static pose because the subject was not stand still for 0.1 s. Sometimes it says camera synchronization failed.

[Scott Uhlrich]

Try again with the hrnet pose model. As of yesterday it is now the default, so just try collecting again. Make sure at least 2 cameras can see every body part.