I too had spondylosis and stenosis L4 L5 . 2 doctors just wanted to fuse it. 3rd,and 4th said they could not fuse due to my Osteoporosis. So i had laminectomy. Nearly pain free(8months) some numbness in toes).
From what I have learned from extensive doctor visits and reading, you don't want to be fused if you have poor bones it just compounds your problems and pain.
I am now on Forteo trying to build bone so I can have surgery if needed. I never want to have to live that pain agsin because they can't do surgery.
Best regards.