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Hello everyone!
I had a question about the advantages and disadvantages of the different
systems used to describe relative motion of rigid bodies: the Euler
angles, the Grood and Suntay joint coordinate system and the Helical
angles. Kadaba et al. (1990) used the Eulerian system and performed an
error analysis of misplaced markers that define the flexion/extension
axis of the knee. They stated that all of the computed knee joint angles
would be in error if the flexion/extension motion did not occur about the
true flexion/extension axis. Would this and similar problems be
alleviated by using either of the other systems (i.e., joint coordinate
system or helical angles)? What other problems could be encountered
through these systems by poorly defining the embedded axes?
Thank you for your time. I will post the responses.
Leonard D'Addesi
Human Performance Lab
Thomas Jefferson University Hospital
tel: 215-503-1646
email: sg943dvw@dunx1.ocs.drexel.edu
I had a question about the advantages and disadvantages of the different
systems used to describe relative motion of rigid bodies: the Euler
angles, the Grood and Suntay joint coordinate system and the Helical
angles. Kadaba et al. (1990) used the Eulerian system and performed an
error analysis of misplaced markers that define the flexion/extension
axis of the knee. They stated that all of the computed knee joint angles
would be in error if the flexion/extension motion did not occur about the
true flexion/extension axis. Would this and similar problems be
alleviated by using either of the other systems (i.e., joint coordinate
system or helical angles)? What other problems could be encountered
through these systems by poorly defining the embedded axes?
Thank you for your time. I will post the responses.
Leonard D'Addesi
Human Performance Lab
Thomas Jefferson University Hospital
tel: 215-503-1646
email: sg943dvw@dunx1.ocs.drexel.edu