I have had all your husbands problems. Don't give up hope. I have had 6 spinal surgeries including the Medtronics Implant. He probably needs spinal fusion. I have had stenosis too. I also have the nerve damage. I was operated on in September and I am so much better. What keeps happening is I continue to grow a lot of scare tissue and in time it bothers my nerves and has to be removed again. I also had to have my implant taken out in Sept. Mine done no good from day one. I am glad your husband got some relief.
This last surgery has done a world of good. I can't say yet about the scare tissue at this sight tho. Time will tell. never give up hope. I have been fused from L 2 threw S 1. Someone else on here has had the growth you are taking about. I haven't. Hang in there and trust your DR. If not, get a new one.
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Fancylady