Relative Motion - relative to what?

[Peter Boettcher]

Using the anatomical axes tool I measure the relative motion of the
femur to the tibia in dogs. Based on my decision which segment I
define to be proximal or distal I get the relative 6 DOF motion of the
respective segment to the other one. However, I would like to know
which segment produces the motion in real life during walking. When
looking at the uploaded video clip
(Laica_TPLO_RightSide_4YPost_Axis.avi) one might say that it is the
distal femur which rotates during pawstrike, other might have the
impression that it is the tibia. Is there a way to objectively measure
which segment is the "moving" part of the joint?

Regards, Peter.

[John A. Nyakatura]

Hi Peter,
Using the anatomically defined axes you will obtain data of the two bones
relative to one another. But it is also easy to measure bone movement
relative to a coordinate system which is for example defined to lie in the
centre of your treadmill. This should then answer your question. We could
discuss possibilities when we meet.
I have now returned from Uruguay and we could meet rather sooner than later.
Regards, John

---
John A. Nyakatura
Institut für Spezielle Zoologie und Evolutionsbiologie
mit Phyletischem Museum
Erbertstrasse 1
07743 Jena (Germany)
Tel.: +49.(0).3641.949154
Fax: +49.(0).3641.949142
john.ny...@uni-jena.de
-----Ursprüngliche Nachricht-----
Von: xr...@googlegroups.com [mailto:xr...@googlegroups.com] Im Auftrag von
Peter Boettcher
Gesendet: Montag, 9. August 2010 22:05
An: XROMM
Betreff: [XROMM] Relative Motion - relative to what?

Regards, Peter.

--
You received this message because you are subscribed to the Google Groups
"XROMM" group.
To post to this group, send email to xr...@googlegroups.com.
To unsubscribe from this group, send email to
xromm+un...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/xromm?hl=en.