ya i dislocated my knee cap, I got kicked in soccer, and had to pop it back into place. now my doc says i have to wear a big, cumbersome (4 me) knee brace snowboarding, and a just do quad stregthening exercise at my cerebral palsy therapy, and it really helps. my knee cap is getting a lot better. the stronger the quad is, the better chance ur kneecap has of staying in the groove made by ur bones in ur knee area.