Sorry to hear Wendy. Sounds hard. The way I tell the difference between spine issues causing weakness/nerve symptoms in my legs and the issue of PN is how symptoms are in my thighs and pelvis/hips - when this is high, and while laying down I have difficulty moving my legs (they’re heavier/shooting pain from spine to thighs, etc) then I know it’s spinal. When I have stabbing into my hells when I place my foot on the floor, I know that’s spine. Numbness in feet/lower legs, loss of distal proprioception (knowing where my foot is in space and having it move accordingly comes from the PN (it took me years to learn the difference). I have failed prior back surgery for chronic compression from multiple disc injuries when I was 28 (amongst other damage). I have a knee replacement on the left (I got it when 47 due to bone on bone and 5 prior surgeries to help keep it working eventually failing), and I’ve damaged the prosthesis in a fall (I’m waiting on another replacement as this is now very loose and contributes to more falls). I know when it’s the knee when my leg buckled and collapses - these falls are kind of ‘building implosion’ type falls; straight down because the ‘foundation’ has collapsed. Hopefully there’s something helpful there?