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Re: FYI -- Microraptor gui, Burnham and Alexander, PNAS...
Excellent point regarding the myology - articulation fidelity is
often analyzed without incorporating constraints of muscular anatomy,
including moment arm changes that may preclude the proposed motion.
Though, even without that, ramming the dorsal side of the femur against
the lateral sides of the ilia, so the bones don't even articulate
anymore, was pretty stupid.
And in this case it's not a mere moment-arm change. The pose shown in
the talk would preclude the _existence_ of any kind of iliofemoralis
muscle or the like, because the dorsal edge of the trochanteric crest
(where such muscles attach) was rammed against the supracetabular crest
or lack thereof.