Study of 4 Cases of Intraprosthetic Dislocation in the Dual-Mobility Cup

This is a prospective study conducted over a 6-month period from January to July 2023, focusing on 4 cases collected in the Orthopedic and Traumatology Department of the Metropole Savoie Hospital Center.The patients included in this study were aged 63 years and older, had presented with an intraprosthetic dislocation (figure1: 1a, 1b) of a total hip arthroplasty with a dual-mobility cup during the study period, and required surgical revision.For three of the patients, this revision involved re-accessing the posterior-external approach of Moore and replacing the intermediate components of the dual-mobility cup.