Physical activity and MRI assessed structural changes in knees of community-dwelling older adults. (April 2015) - Fujii, T.; Boudreau, R.M.; Guermazi, A.; Strotmeyer, E.S.; Brach, J.; Miljkovic, I.; Carbone, L.; Harris, T.B.; Nevitt, M.; Shiroma, E.J.; Newman, A.B.; Kwoh, C.