Figure 1a:

MR images of juvenile osteochondritis dissecans (JOCD) cartilage segmentation. (a) Region of interest placed around the cartilage within JOCD lesion (blue contour) Overlying epiphyseal cartilage is shown with the green contour. (b) Region of interest placed around cartilage overlying JOCD lesion (dark green and blue contours). Green and red contours (b, c) define the excluded anterior and posterior portions of the oversying epiphyseal cartilage, respectively. Cartilage partitioning was performed by using the dashed lines adjusted by using the red box labeled L in b and c. (c) Region of interest placed around cartilage on weight-bearing medial femoral condyle (dark green and blue contours). Anterior boundary of weight-bearing surface was defined as anterior margin of anterior horn of medial meniscus, and posterior boundary was defined as posterior margin of posterior horn. The same region of interest was placed around the weight-bearing medial femoral condyle in control participants.