Pre- and post-operative MR of case number 1. The improvement is evaluated quantitatively (100% of filling of the lesion) and quantitatively (decrease in T2 values). (A) PDFS sagital imaging of the right hip showing the absence of cartilage in area of the anterosuperior articular surface of the acetabulum. (B, C) T2 mapping of the same hip 18 months after the surgery and the repair of the ulcerated area with improvement (decrease T2 values, showing mixed fibrocartilage and hyaline cartilage).