Osteoarthritis also goes hand in hand with some injuries, both traumatic and overuse injuries.
When I was in my early 20s and a competitive powerlifter, I was having a lot of pain and mobility issues with one of my shoulders. I went to the same orthopod who worked on the pitchers for the Oakland As and when he looked at the xrays of my shoulder, he didn't think he had the right radiographs because I was young and there was a lot of degeneration that looked like arthritis. He kept asking me, "How old are you??"
I want to hear more about you being a competitive power lifter.