@4deborahrb usually we might do Reclast or Fosamax (the latter would be possible after only two years of Prolia). But you are in a special situation with the lumbar fusion planned. Someone posted a study showing that Evenity prevented rebound after Prolia with some reduction in effectiveness, but still effective.

In your situation I would try Evenity and do bone markers and maybe pay out of pocket for a DEXA if needed. I hope you can get on something quickly- either Reclast or Evenity. It is hard when different specialties are involved and they don't know the details of each others' areas of expertise!