Don't know about rotator cuff surgery but, I fell off a lader & drove my femur THROUGH my tibial plateau. 8 hours of surgery, 13 skrews & a metal plate in my leg. No more whoops for me but, I still ride kinda fast when I'm just playing out in the woods with friends. SUCKS that I can't race hare scrambles anymore but, there's still a TON of fun to be had on dirt bikes.
My Dr. said "No more dirt bikes" but, my hair lipped uncle gave me better advice when he said "Hmuck em" (refering to the Dr.)