I underwent a left SI joint fusion in 7/06. Started having problems again after a minor fall in October 07. My orthopedist had a MRI and CT scan done as well as plain filmes and said everything looked OK. Then went to a pain specialist where an injection in the lefet SI joint showed it to be the source of my pain. I have been on long acting pain meds for the last few months and my family doc decided I should get a second opinion. I gathered up all of my recent films, etc. I didn't expect much. Five minutes after looking at my films, he siad that it clearly showed a failure of fusion, with motion of the screws detected. How could my other MD as well as the radiologists not see this? The new doc clearly showed it to me on the films as well? Next step will probably be removal of the hardware. Any thoughts?