I've thought about that
If the operated level is easily accessed, like L5/S1, I wouldn't be too worried about the keel vis a vis a revision. The few reports I've read about revisions on keeled discs, they appear to be easy enough to remove, if accessed from the anterior.
I think the Activ-L is available in the US through clinical trials now. Allan, do I correctly recall that money is an issue for you? That might be worth looking into. It's used in Europe of course, and Canada; I like its design. This disc is available with or without a keel.
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