Jim,
What does she mean inoperable? If your facets are the problem, adding posterior instrumentation is certainly doable. If it is felt that the prosthesis must go, revision at L5-S1 is not nearly as scary as it is at L4-5. I've seen both of these surgeries this summer and know many others.
Do you have an AP and flex/ext xrays?
The ring is supposed to move around...
Calling you now.
Mark
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