Figure 2
![Figure 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1749-799X-5-28/MediaObjects/13018_2009_Article_170_Fig2_HTML.jpg)
Time course of the development of PTH1R expression in osteoarthritis. The percentage of PTH1R+ chondrocytes was significantly increased in the anterior cruciate ligament (ACL) transection group after 6 weeks and 12 weeks. Values are the mean and SD.* = P < 0.05.