View Full Version : Re: pelvis motion and Soft tissue artifact - summary

01-06-2010, 08:40 AM
Dear Biomech-L subscriber,

I would like to thank the responses received on the question of soft tissues
deformation in the pelvis, especially for Ms. Becky A. Zifchock and Dr. Dustin
Bruening. I had problems with my e-mail provider and I lost an answer posted today -
I thank if the message could be sent again.

Procedure recommendation: to define the pelvis plane using a least squares plane fit
to all four markers (LASIS,RASIS,LPSIS,RPSIS). Tracking the motion again using the
least squares solution of all 4 markers (Spoor and Veldpaus, 1980) in essence
"averages" out some of the discrepancy you see between the PSIS vector and ASIS

Thank you very much again.
Best Regards,

Wagner de Godoy
HIAE - Brazil