1. Methodologic issues in clinical trials for prevention or risk reduction in osteoarthritis 
J.M. Jordan, M.F. Sowers, S.P. Messier, J. Bradley, G. Arangio, J.N. Katz, E. Losina, L. Rovati, N. Bachtell, C. Cooper, T. Spector, W. Zhang, J. Gardiner, M. Wahba 
Osteoarthritis and Cartilage 
Volume 19, Issue 5, Pages (May 2011)
DOI: /j.joca
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2. Fig. 1 Structural abn’l=structural abnormality.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
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3. Fig. 2
Three-year transition probabilities of K–L score of 1 (doubtful OA) staying at a K–L=1 or progressing to a K–L=2 to OA as a function of age (years) and BMI (kg/m2): designing a prevention trial of knee OA. (A) Transition probability of K–L=1 score staying at K–L=1; (B) Transition probability of K–L=1 score to a K–L=2 score, indicative of OA.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
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