Fig. 4

Synovial levels of TNF-α.
The synovial levels of TNF-α were significantly elevated on day 14 after the intra-articular injection of NGF compared with levels on day 7 in rats in both the NGF50 and NGF100 groups. The synovial levels of TNF-α were significantly higher in rats in NGF100 group than in rats in the shamoperated group on day 14. Bars represent standard deviation. *P<0.05.