Help me understand what scar tissue on my muscle is exactly? IKYANMD

I am a runner, and soccer player. I have had 3 surgeries over the past 2 years to try to repair my right hamstring muscle from chronic tendionosis, hamstring syndrome, and I had a tenotomy.

http://ask.metafilter.com/250233/Help-me-understand-what-scar-tissue-on-my-muscle-is-exactly-IKYANMD