M6-L revamp
Hasn't the initial comps with M6-Lbeen address? I think it's better now for lumbar than it first was. In either case; if you have had facet joint issues, a constrained device like M6 would seem best. Like Harrison said; the Pro-disc has had a lot of issue where this is concerned. Still one has to weigh their options. There are different things that cause pain where the spine is concerned. The nerves that exit the spinal canal, the spinal cord itself, then there is the bone on bone from spurs (osteophytes) and facet joints. What is your primary pain source? Mine was the bone spurs pressing o the nerves. My facet joints were only mild so I was a good candidate. Also keep in mind, radiologist read MRI's and CT in varying opinions. It may be worth it to get more than one! I have had one mention something and another leave it off altogether... 
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54 yr old female 5'7" 147 lbs. non-smoker conservative treatments failed
2007 fusion @ C4-6 peek cages, failed due to long term use of cox-2 inhibitor
2008 revised C4-6 donor bone, plate & screws
2009 fusion with Roi-C @ C3-4
2015 MRI & CT mjr ddd @ C6-7, segmental kyphosis at C7-T1, 2-level M6-C prosthesis by Dr. Clavel Barcelona Spain
2019 H.O. formed behind M6-C @ C6-7 left nerve rt & in spinal canal.
2020 Revision C6-7 to a CP-ESP prosthesis by Dr. Schmitz Dusseldorf Germany
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