2006 I had a plif. Year later the pain came back. MRI states that at l5-s1 there appears to be a partial fusion. Post op x rays said solid fusion. Does that mean I don't have a solid fusion and that could explain my leg and back pain. I also have adjacent segment disease at l4-5. Mild retrolisthesis mild broadbased posterior disc bulge with annular tear indenting thecal sac mild facet arthrosis disc narrowing and deccication. Is it possible the segment above fusion diseased because of failed fusion. I hope I don't need another surgery. I'm only 28 years old but I'm in alot of pain.