Increased concentration of IL-6 in the synovial fluid of patients with cartilage damage. Concentration of IL-6 in the synovial fluid of healthy (H), symptomatic cartilage defect (CD) and osteoarthritic (OA) donors. Note the logarithmic scale of the Y-axis; a = P < 0.001, b = P = 0.001.
Tsuchida et al. Arthritis Research & Therapy 2012 14:R262 doi:10.1186/ar4107