Catherine, YOU have my HUG empathy... I thought I was facing a similar surgery including the T5-S1 joint. Upon my questioning the Surgeon, 'I' decided that joint being fused would greatly reduce my flexibility... I likely will not get that fusion. I'm being assessed for a low-back E-stim.
Hopefully, via possible modalities like E-stim and more Phys Therapy, perhaps even hypnosis... YOU're pain management will help make your life 'better' !.... Sending blessings and HopeS ~
~ Greg, St Pete, FL