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Jesus Dapena
12-08-1995, 07:08 AM
> For one, it makes the use of live volunteers reasonable! Implanted
markers are fine for cadaver studies. *In vivo* needs surface markers.
>

> Sincerely,
>

> Carolyn Small

Well, there are other options too. For instance, the researcher can
estimate the locations of the internal joints directly from the projected
images. You sacrifice some of the accuracy in the digitization of the
landmarks, but you can get 3D coordinates of internal landmarks without
having to implant anything in your subjects. In fact, in some situations it
is not possible to put even surface markers on the subjects; for instance,
this is generally the case if you film or videotape a major sport
competition.

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Jesus Dapena
Department of Kinesiology
Indiana University
Bloomington, IN 47405, USA
1-812-855-8407 (office phone)
dapena@valeri.hper.indiana.edu (email)