I have been studying this disease since my stenosis has gotten worse and have spoken to many in the spine industry. Laminectomy relieves pain howver creates instabilities. The coflex in clinical trials is a dynamic implant that controls the motions post laminectomy and has been implanted over 10,000 times in Europe. Xstop is just a chunk of metal that resorbs bone. Ive done the research and this is the best treatment if YOU HAVE TO HAVE SURGERY.