The trauma of your accident, stretched and or tore ligaments, tendons and muscle fibers. This greatly contributes to your disc and spinal instability and resulting continuation of your condition.
Google up Prolotheraphy.
Basically, it consists of injections into the damages area with irritants, which cause the body to react and produce new tissue. The structures can straighten by as much as an additional 40%. This added stabilization, creates the environment for your body to heal faster with a more permanent result.
The best of health to you!