I had a lower lumbar fusion of the L4 L5 and S1 on 9/2/09 then on 9/3/09. I was rushed back to the operating room for a hematoma on my L5. I was then admitted in for surgery again on 12/15/09 for a synovial cyst on the L5 and then on 5/12/2010 I was once again admitted for surgery for another synovial cyst once again on L5. then on 5/12/2010 I rushed back into the operating from the recovery room with another hematoma on my L5. I asked my doctor if these cyst could be forming because of the bmp infuse allograft he told me that it could be possible but would not commit himself. my question is has anyone else had this type of problem with a lumbar fusion surgery.