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 I know this is probably a stupid question, but did you check out the website?  Disc Dynamics, DASCOR Disc Arthroplasty System 
I have never heard of it, but it does seem interesting.  I hope someone here might have some experience with it and can shed some more info.
				__________________Chiari 1 malformation - successful surgery 1-22-09
 C5-6 herniation (extrusion) with moderate central canal stenosis and bilateral foraminal stenosis.
 Prodisc-C @ C5-6 surgery on 5/28/09
 VATS thoracic fusion @ T3-4 and T6-7 on 9/11/09
 Fusion w/cage @ C7-T1 on 11/12/09
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