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(Article begins on next page) The Harvard community has made this article openly available. Please share how this access benefits you. Your story matters. Citation Guermazi, Ali, Frank W. Roemer, Deborah Burstein, and DaichiHayashi. 2011. Why radiography should no longer be considered a surrogate outcome measure for longitudinal assessment of cartilage in knee osteoarthritis. Arthritis Research & Therapy 13(6): 247. Published Version doi:10.1186/ar348