x-stop was a step forward for interspineous spacers and patients that have the specific kind of stenosis that is helped by this type of decompression. The old folks who have leg pain and numbness when they stand upright, but get relief when they lean forward over their shopping cart... these people do very well with xstop, wallis, coflex, etc...
If you have severe DDD with discogenic pain, you can get some relief with these devices because they can offload the posterior annulus and limit motion within a more neutral range. These devices are interesting and useful in specific types of cases, but this is no magic bullet for most of us.
Good luck... let us know how your research goes.
Mark
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