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Re: Theropod posture-in-motion article



----- Original Message -----
From: "Dann Pigdon" <dannj@alphalink.com.au>
To: <dinosaur@usc.edu>
Sent: Monday, August 27, 2001 10:23 PM
Subject: Re: Theropod posture-in-motion article


> [...]
> To be honest, this research (if it can be called that) seems full of
> holes. How can a human body, no matter how many weights and bits of
> lumber are strapped to it, ever mimic the stresses felt by a theropod?
> You'd have to have major surgery to alter the way the leg muscles attach
> to the pelvis, and to restrict the range of motion of the knees and
> ankles. A human, who has walked in a certain way most of their life,
> straps on some hardware and declares "ooh... this feels weird. They
> mustn't have done it this way" after only a few hours or days. It must
> be so!
>
> Now, if the subjects had radically different skeletal and muscle
> structures, and had lived their entire lives as a one-man-hardware
> store, perhaps then...

It would already have been a lot better had the test persons tried to walk
with horizontal trunks and only got tails behind. It would have been even
better if someone could construct a mobile tail. Then humans have extremely
long legs in relation to everything else, which means a very high center of
gravity and...

However, the skeleton has a posture that is impossible. Look at the femur
and pelvis: it is shown in PDW that exactly this -- *Allosaurus* is used as
the example -- would dislocate the hip joint and heavily distort several
muscles.