Oddly enough, you will find most of the relevant FDA study data on the DepuySpine web site:
http://www.depuyspine.com/products/s...ty/charite.asp
Then click on “package insert.” You may go blind trying to read it though! You will find the voluminous studies on the FDA site (with patience), but also see the post about the “new & improved” FDA web site in the article library. Lastly, see the long-term study in Arthroplasty Central.
Hope this helps, let’s talk again soon.