Jim,

Good luck with the injections. I've had (2) lamina surgeries, both with your symptoms. Nothing worked until they cleared the nerve. They should be able to tell from the MRI that's it's pinched. No injection is going to undo that - but I'm not a doctor.
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)