There are some systems that took the great idea of Dynesys and resolved many of the problems while adding improvements. Modular systems that can combine flexible and fused segments. These modular systems will allow conversion of a flexible segment to fusion if needed with minimally invasive exchange of the spacer, using the screw system that is already in place.
DSS from paradigm spine has 510k approval in the US for fusion. (flexible system not yet approved?)
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