Study of 3804 runners from 2019, 2021 Chicago marathon looked at assocn betw marathons running and arthritis. Prevalence of hip / knee arthritis was 7.3%. Hip/Knee OA was assoc w/ prior injury/surgery, older age, FamHx, & BMI (not #marathons, mileage) https://t.co/P91dR9kSgY https://t.co/p7hFKEbGOw