Figure 4
![Figure 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2F1749-799X-5-28/MediaObjects/13018_2009_Article_170_Fig4_HTML.jpg)
Correlation between the macroscopic grade of osteoarthritis (OA) and the expression of PTH1R. A negative correlation was demonstrated, with a Spearman's coefficient of -0.541 (P < 0.001).
Correlation between the macroscopic grade of osteoarthritis (OA) and the expression of PTH1R. A negative correlation was demonstrated, with a Spearman's coefficient of -0.541 (P < 0.001).