I don't know how much of my secondary problem is due to core instability, but I know that a good deal of it is. Many of my core muscles just wouldn't work as a result of the damage, and since I didn't have physical therapy much secondary imbalance of mucles and additional instability eventually developed.
I just found a wonderful book. Even if a person can't do a lot of what it suggests, just knowing more about the body works helps work around things that can't be improved (without causing unnecessary extra damage), improve what can be improved, and recognize bad habits, damaging coping mechanisms, and myths that are damaging (for instance, stretching before warming up

).
Framework, by Nicholas A. DiNubile.
Good read too.
rose