Diam is one in a huge crop of interspineous devices that came out several years ago.
Fixano U, now Coflex; x-stop, wallis, and many more. Typically, they are motion limiting devices instead of motion perserving devices, but will allow more motion than fusion.
The new Disc-Motion posterior ADR with spinal stablization is in play for people who want motion preservation but not fusion. I'll be writing more about this later in the week as I've seen an implantation and have discussed it pretty extensively with Bertagnoli.
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