@mayofeb2020 My fusion was L-4 to L-5 and L-5 to S-1. Those are the levels that primarily affect your legs. The pain radiated from my back, through my glutes to my thighs but only to my knees. It did not affect the knee or below. (Nothing but epidurals gave me any relief, and I can't tolerate opioids or some muscle relaxants so I was in the same boat.) The fusion DID fix my sciatica. My spine doctor did a cervical fusion for me in 2016, so I'd been seeing him for 10 years. He'd been keeping an eye on my lumbar spine since i see him every year for my neck anyway. He knew my exercise schedule (every day) and told me to keep it up until the sciatica showed up. He gave me the epidurals and that's the first time surgery even came up. Even though I know him well, I still got a second opinion. Then I made him show me the scans and walk me through them. I also have stenosis in L-3, which he widened during the surgery but it continues to deteriorate. My spine issues are caused by arthritis, not osteoporosis or any other conditions. Have they looked at your lower lumbar spine? I assume they've ruled out blood flow issues like PAD and they've done MRI's on your calves to make sure you don't have muscle injury. You may also want to explore amitriptyline (Elavil). or other anti-depressants with your doctor. They gave me amitriptyline for my vertigo to calm the nerves in my neck and amazingly it worked. I'm totally spit-balling here but I did a lot of research on why the amitriptyline worked for my vertigo. All that reading proved to me that the medical and scientific community still don't fully understand brain chemicals. This is a lot to digest and I am not qualified to be giving any advice--it's just my own experience. In the meantime I would try the TENS unit. If an over-the-counter TENS unit helps even a little, even that will tell your doctor something (there are stronger TENS therapies.) I really hope one of these works for you.