Figure 4.

Association of Kellgren-Lawrence grade with cartilage thickness in nine medial femoral subregions. The center line in each box plot indicates the median value, the boxed area indicates the interquartile, and the whiskers extend from either side of the box to show the minimum and maximum values (or 1.5 times the interquartile range if the minimum or maximum values fall outside this range). Asterisks over the box plots indicate p-values of multiple comparisons by the Steel–Dwass test with KL grade 0 after the Kruskal–Wallis test. Asterisks between adjacent box plots indicate p-values of multiple comparisons by the Steel–Dwass test after the Kruskal–Wallis test. *; p < 0.05, **; p < 0.01, ***; p < 0.001.