Fig. 1

T1-weighted turbo spin echo sequences (T1-TSE) follow-up MR images of osteochondrosis dissecans of the right knee joint of twin 1 in the sagittal plane: from the stage at the onset of symptoms a), there is a decrease in lesion size and perifocal edema after b) six months and c) fourteen months until complete consolidation of the lesion under conservative treatment after d) two years of follow-up. There is a decrease in reactive cartilage thickening with a continuous cartilage surface