I have JHMS, there is a difference between that and having hyper mobile joints.. Many of my family have joint hypermobility, but only my 10 year old nephew and I have the painful Joint Hyper Mobility Syndrome. It just so happens that he has had a tough time, broken home, alcoholic mother.. So, having a traumatic childhood, not necessarily PTSD, can have a worsening effect on already present conditions..
As a child, I was a fast runner but avoided gymnastics as I was in a lot of pain. Frequent ankle and knee sprains kept me out of cross country championships...