One of the most vulnerable parts of the human body.
If the human were still on all fours the spine would be supported from 4 corners.
However as we are an animal on two legs, we have to create tension up, across and around the spine using muscles in order to support the chocks/vertebrae in the tower that they are designed to stand. If the vertebrae and discs are NOT SITTING FLAT TO FLAT then there will be additional load on one or other side of the vertebrae/discs, which will cause bruising/ wear/ swelling/edema.
Below are some examples of what can go wrong. Scans are a perfect way to see what is going on with the human body but Surgery is not always necessary nor the answer. In fact only 30% of current back surgery is successful and necessary. More often than not correcting posture and alignment through mobilisation followed by muscular release techniques, along with stabilising and strengthening exercises, has a much better and more long term effect.
The reality is that looking after the posture can never be a waste of time, if surgery is deemed necessary then it will help the rehab, if it is not then it will reduce the pain.
To understand what is causing problems and affecting you spine it is best to start with a Biomechanics Assessment and see how you are actually moving.