Effect of the TNF-α inhibitor on the expression of inflammation-associated factors in synovial fibroblasts isolated from rats with osteoarthritis. (A) Levels of MMP-3, MMP-9, VEGF and ADAMTS4 expression in the synovial fibroblasts of rats with osteoarthritis and healthy rats, as determined by western blotting. (B) Levels of MMP-3, MMP-9, VEGF and ADAMTS4 expression in synovial fibroblasts taken from rats with osteoarthritis following treatment with TNF-α inhibitor or vehicle. Data are expressed as the mean ± standard deviation. **P<0.01. TNF-α, tumor necrosis factor α; MMP, matrix metalloproteinase; VEGF, vascular endothelial growth factor.