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RE: Hip Height (was: RE: New Tyrannosaurus paper)

> -----Original Message-----
> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> Jordan Mallon
> Sent: Thursday, February 28, 2002 7:09 PM
> To: dinosaur@usc.edu
> Subject: Hip Height (was: RE: New Tyrannosaurus paper)
> >From: "Thomas R. Holtz, Jr." <tholtz@geol.umd.edu>
> >Hip height for striding vertebrates is most often calculated as "femur
> >length + tibiotarsus length + metatarsus length.
> I've always wondered, why is the ilium never included in hip height?
> Surely, the top of ilium is the top of the hip, is it not?

Okay, this depends on what you want the term "hip height" used for.  If it
is a maximum estimate of the pendulum-like swing of the body, then the top
of the ilium is above the pivot point (the hip socket).  If you are simply
stating "the animal is this high at the hips", then you should include the
ilium, but you would have to subtract some factor from each of the leg
segements, as all the joints are flexed to some degree.

                Thomas R. Holtz, Jr.
                Vertebrate Paleontologist
Department of Geology           Director, Earth, Life & Time Program
University of Maryland          College Park Scholars
                College Park, MD  20742
Phone:  301-405-4084    Email:  tholtz@geol.umd.edu
Fax (Geol):  301-314-9661       Fax (CPS-ELT): 301-405-0796