Hi Megan...
When you talk about revision, are you referring only to the removal of the rods? (That's not typically considered revision.)
It's possible that there was one or more levels of your fusion where there was not enough bone to hold without the rods, or it's possible that there were one or more levels that were not fused at all, but I don't think you'll ever know for certain.
If you start finding yourself with a kyphotic (forward) lean, you should definitely consider having the implants put back in, as that would indicate that your spine is unstable.
Regards,
Linda
Never argue with an idiot. They always drag you down to their level, and then they beat you with experience. --Twain
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Surgery 2/10/93 A/P fusion T4-L3
Surgery 1/20/11 A/P fusion L2-sacrum w/pelvic fixation