There are a variety of issues with problems fusing.
The fusion hardware is not designed to withstand the load of carrying your weight indefinitely. Once fusion occurs, then the hardware is redundant. In some cases, the hardware may be removed later. I'm talking about posterior instrumentation, such as pedicle screws and rods. Most anterior column implants are inside of the space that should fuse and cannot be removed later unless the fusion will be reconstructed..
With non-unions that remain structurally sound, there may be a problem with motion not being eliminated. If the painful tissues are still jostled around by ongoing motion in the segments that are supposed to be fused, it may remain painful.
I hope this helps you understand more about the issues you should be discussing with your doctors.
Mark
PS.... if you want to post your films, we can discuss them on the forum. If you 'd like to send them to me and discuss them privately, let me know. (no charge.) Contact me via the contact page on the GPN website linked below.
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