Additional file 1.

Relationships between articular cartilage parameters and subchondral bone mineral density (BMD). Figure S1 in Additional file 1: A figure showing Spearman correlation between cartilage damage and subchondral BMD. Figure S2 in Additional file 1: A figure showing Spearman correlation between receptor activator nuclear factor-kappaB ligand (RANKL) protein expression in articular cartilage and subchondral BMD. Figure S3 in Additional file 1: A figure showing Spearman correlation between RANKL/osteoprotegerin (OPG) ratio in articular cartilage and subchondral BMD.

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Martínez-Calatrava et al. Arthritis Research & Therapy 2012 14:R149   doi:10.1186/ar3884