do you think you might have some trigger points in the muscles that are causing them to continue spasming?
Have you had any expert PT, chiro, or therapeutic massage to help find some of the possible causes?

If the scar tissue is the main cause of the problem, I'm don't know if there is a good fix for that.
I know some have had the scar tissue cleaned out but their bodies just seem to produce it again over time.

I wonder if Low level laser {also called cold laser} would help with the scar tissue problem.
That might be something to research.

My chiro used laser for my treatment on occasion, esp if there are specific sore spots that are bothering me at the time, muscles or joint, works for both.