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Biomech-L colleagues:
Greetings, I have a bit of a motion analysis/kinematics quandary that has
come up in my experimental work.
I was wondering if you'd run into problems something like the one I'm
currently tackling? I am trying to obtain neck angle measurements in pitch
studies on seated subjects. In order to image the positions of the C2 and
C7 vertebrae, I mounted plastic extenders on the neck of the test subjects
using two-sided tape. Have any of you ever worked with such extenders?
I imaged LEDs mounted on the extenders and found that I couldn't find out a
method for correcting for the (known) geometry of the extenders without
assuming a neck "center of rotation". Unfortunately, this center of
rotation was itself to be determined from our analysis. I have thought of
performing a sensitivity analysis to determine the extent of asssumed
variations in neck COR on neck angle using the extender geometry. Have any
of you dealt with problems like this? Please feel free to write to me if
this presentation of my difficulty is hard to understand. Thank you in
advance for your consideration of this matter.
Sincerely,
Cheryl Pattin
Cheryl A. Pattin, Ph.D.
Research Associate
Sensory Motor Performance Program Personal phone: (312) 908-7944
E809 - Room 1406 Department phone: (312) 908-3381
Rehabilitation Institute of Chicago FAX (312) 908-2208
345 East Superior Street e-mail: cheryl-ric@nwu.edu
Chicago, IL 60611
Greetings, I have a bit of a motion analysis/kinematics quandary that has
come up in my experimental work.
I was wondering if you'd run into problems something like the one I'm
currently tackling? I am trying to obtain neck angle measurements in pitch
studies on seated subjects. In order to image the positions of the C2 and
C7 vertebrae, I mounted plastic extenders on the neck of the test subjects
using two-sided tape. Have any of you ever worked with such extenders?
I imaged LEDs mounted on the extenders and found that I couldn't find out a
method for correcting for the (known) geometry of the extenders without
assuming a neck "center of rotation". Unfortunately, this center of
rotation was itself to be determined from our analysis. I have thought of
performing a sensitivity analysis to determine the extent of asssumed
variations in neck COR on neck angle using the extender geometry. Have any
of you dealt with problems like this? Please feel free to write to me if
this presentation of my difficulty is hard to understand. Thank you in
advance for your consideration of this matter.
Sincerely,
Cheryl Pattin
Cheryl A. Pattin, Ph.D.
Research Associate
Sensory Motor Performance Program Personal phone: (312) 908-7944
E809 - Room 1406 Department phone: (312) 908-3381
Rehabilitation Institute of Chicago FAX (312) 908-2208
345 East Superior Street e-mail: cheryl-ric@nwu.edu
Chicago, IL 60611