Fig. 6

Postoperative radiographs (05/2018) (A), at 3 months postoperatively (B) and at the final follow-up (FU; 04/2020) (C) after “cup-in-cup” revision with a dual mobility cup (DMC). The cup position had already changed at the 3 month-FU (B) and had not further changed at the last FU (C), being at a much steeper position inside the well-fixed cup (white ellipses). This change of position was indicative of loosening of the DMC