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RE: Caudipteryx suffered from osteoarthritis

Has the sample size of *Caudipteryx* increased recently?  Sure, I'm aware that 
there are multiple individuals, but "large population samples" is news to me.  
Also, what is the scientific significance of claiming the oldest documented 
case of osteoarthritis in the fossil record?  Is susceptibility to 
osteoarthritis a derived condition in amniotes?  Is there an observed lack of 
osteoarthritis in Triassic and Jurassic dinosaurs that is anomalous enough to 
deserve explanation?
> Date: Wed, 4 Jan 2012 19:07:50 -0800
> From: bscreisler@yahoo.com
> To: dinosaur@usc.edu
> Subject: Caudipteryx suffered from osteoarthritis
> From: Ben Creisler
> bscreisler@yahoo.com
> A new online article (classifies Caudipteryx as a bird, however):
>  Bruce M. Rothschild, Zheng Xiaoting & Larry D. Martin (2012)
> Osteoarthritis in the early avian radiation: Earliest recognition of the 
> disease in birds.
> Cretaceous Research (advance online publication)
> doi:10.1016/j.cretres.2011.12.008
> http://www.sciencedirect.com/science/article/pii/S0195667111002084
> Abstract
> Osteoarthritis is extremely rare in wild mammal populations (less than 1%) 
> and varies in frequency according to species (0--25%) in recent birds, where 
> it is inversely related to size. Large population samples of Early Cretaceous 
> birds in China permit us to analyze its frequency in one of the earliest 
> avian radiations. In these samples, the larger bird (Caudipteryx) shows a 
> high frequency (30%). The earliest previous documentation of primary 
> osteoarthritis in any animal is in a family of Early Cretaceous dinosaurs 
> (Iguanodontidae). We document its occurrence in a basal bird and in one of 
> the forms considered by some to be a feathered dinosaur. These occurrences 
> are 20 million years older than the next oldest occurrence of osteoarthritis.