I just came from my neuro/spine surgeon and he is recommending an artificial disc at the 5-6level, which is right above my existing fusion, and then a fusion with plating at the 3-4level. He says this will give me more movement rather than having plates at the 3 levels 4-7. Has anyone had this done? My ins. co. considers the art. disc still to be experimental but my Dr. says it is not. Any advice on this? Thanks.