The m6 and neodisc are interesting designs. Whether or not they are better than other motion preservation devices remains to be seen.
I have seen many more m6 cervical discs needing explant revisions than I have of any other disc... not by just a little bit. And, this is in spite of the m6 being done in much, much smaller numbers. I like many of the design components, but questions about the materials, longevity, etc... will only be proven with time.
Mark
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