Imaging Findings:
An undisplaced osteochondral defect is seen in the medial femoral condyle (Image 1).
The osteochondral fragment shows bone edema with pockets of fluid around an undetached and undisplaced osteochondral fragment (Image 2).
On the sagittal Proton Density images (Image 3), it can be seen that the overlying cartilage is intact. Given the degree of edema surrounding the undisplaced defect, the lesion is characterized as being unstable.
