Pre- and post-operative MR of case number 2. The improvement is evaluated quantitative (100% of filling of the lesion) and qualitative (decrease in T2 values, showing hyaline cartilage). (A) PDFS sagital imaging of the right hip showing the extensive zone of alteration of the signal and delamination in the anterosuperior quadrant of the acetabular articular surface. (B–D) T2 mapping of the same joint 15 months after the surgery and the morphological improvement of the chondral lining and practical normalization of T2 values.