Im sure there is more proper medical murabo jurabo to explain it properly, but the spine is the main support structure to the human body and it houses and protects a vast majority of the central nervous system.
Here's some of my thoughts:
Our whole body is a fine tuned machine. The spine is no exception. When one part of it is not in balance, the entire system is compromised (a chain if you will) and while one part is in trauma the other parts of the whole have to work doubly hard to try and maintain and achieve balance.
From the main nerve corRAB are many nerves that branch off and go in and through and around the spine structure, with even more fiberous type nerves doing the same.
I believe this area is much more sensitive to the healing process due to the central nervous system being right there. Nerves take their sweet time healing and while some of us may not experience the serious nerve pain that others have, I would be willing to bet that anyone with spine issues that their nerves are effected in some way, even temporarily. And exactly how they repair themselves and why some dont is still quite a mystery for doctors. They know alot more today, but there is still sooo sooo much they dont, "yet".
I am hopeful that someday, spineys will no longer be spineys and we can be repaired as good or better than new and painfree!