Hi,
Yes Anna is correct the 35.5 years is a simulated test in some kind of test rig. The web link where I found the info was
www.centerforspinecare.com , FDA approval should be arounf mid 2007 , it looks like the best from a design point of view , but that could stand for nothing , until the FDA trials are complete ...lets see!! All I am concerned about is revisions , if the charite or prodisc wears out to soon. say 10 years , I will be back under the knife. Saying that Anna mantioned that the Charite testing data was 20+ years but in real life it only lasts 10 years , so I guess that says a lot about the accuracy of the testing figures.