I should have been more clear. I was looking for the Cervical disks, the LP is for lumbar. I do agree about the keels, that's why I'm leaning towards the Prestige.
As for revision the prestige comes out very easy, so if there is a problem down the line, remove 4 screws and it's out. If that ever happened, hopefully the M6 would be approved by then.
FYI - I heard through the grapevine that Spinal Kinetics was starting to prepare for FDA trials.
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