in general, for healthy people, in the 3D motion analysis to define the anatomical coordinate system on segments, one
frame in static position is taken by the camera, which will make segment angular changes based on this. Now consider a patient with pelvic abnormalities. The pelvic anatomical frame in this case is defined as zero for a healthy person. It will be different now if a patient completes a corrective exercise. If these exercises affect on the pelvic inclination,our anatomical coordinate system will change in post test. As a result, may the effect of exercise be eliminated in the final results of the comparison of pelvic kinematic pre and post test.
What is the proposed solution?
Is there a resource to fully explain this?
I am using Vicon system and trying to answer you according to Vicon.
Your concern is correct. The static frame will be used to zero the offset angle and regard it as the anatomical neutral position. If you do the standard procedure for normal subject, it will be wrong for abnormal offset angles.
If possible, you may do the calculation by "Body Builder", a software for Vicon data modelling.
If not, you may import the trails after intervention into the old data session. You trick the system they are data in the same session. Then, the angle change will be the difference between the old and new static frame.
Hope it helps
hi Man Cheung
thank you so much for answer the question,
This method looks good, but do you know the source of the proposed method?
It's very important for me to have a valid source.
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