Association between cartilage surface erosion (score for total knee) and collagen type II degradation products (CTX-II). Rats from all treatment groups in cohort C (see text and Table 2) were stratified according to CTX-II change after 4 weeks and the average surface erosion for each quartile (Q) is presented. Error bars indicate SEM. P = 0.001 by nonparametric analysis of variance (ANOVA).
Høegh-Andersen et al. Arthritis Res Ther 2004 6:R169-R180 doi:10.1186/ar1152