Advice Needed L4 L5 Ligament flavum with mod stenosis, claudia equina

I have tried three rounds of PT, two l4 l5 ablations. Multiple rounds of steroids. Walking and standing causes nerve pain and numbness. Pelvic pain and pelvic weakness standing and sitting. Have to lay down multiple times a day. L4, l5 has some slippage. Stability issues with footing. Nerve burning pain down side of thighs, saddle numbness but fully functional.

Has anyone had l4 l5 ligment correction and fusion along with opening up stenosis surgery?

What was your experience if so?