Variability of walking patterns and worsening knee cartilage damage over two years: the multicenter osteoarthritis study. Issue 1 (April 2020) - Voinier, D.; Neogi, T.; Stefanik, J.J.; Guermazi, A.; Roemer, F.W.; Nevitt, M.C.; Lewis, C.E.; Torner, J.; White, D.K.