I am in the UK and am having ongoing problems with my neck prior and post surgery. I had a Pro Disc C C5/6 in 2010. For the first year there was a decrease in my pain symptoms, now they are back with a vengeance. I am seeing a new spine doc and he is sending me for CT scan and also MRI to see what is going on (or hoping to). I went to see him and he said that the plain radiographs of my neck show that the prosthesis is eccentrically placed, although he didn't tell me this at the time, have just received a letter from the hospital with outcome of the appointment etc. I have been having epidural injections into my C spine, but these have not helped either. I work full-time, but the pain is now really bad and is incessant. I have to take pain meds each day, but with working can't take meds that are too strong. I have previously been diagnosed with cervical spondylosis and before I had the disc replacement the results of my last MRI scan showed C5/6 subluxation with cord abutment and deformity and particularly left sided foraminal narrowing. C6/7 disc degeneration with foraminal narrowing. Another thing that was reported was that there was a also a degree of cerebellar tonsillar herniation. What does this mean? Would be really grateful for some further help. Thanks.