John is correct. I did not find it helpful at all. Sadly. I ended up with an implanted spinal cord stimulator instead. My way of dealing with the pain and avoiding a major back surgery involving another fusion at more than one level again. Is it perfect? No. But it allows me enough relief I can walk my dogs again most days, work in the garden/yard, etc. FYI, my stenosis is “moderate to severe” on MRI several years ago now. Guessing it’s now left the moderate model behind…argh.