[Dislocated dual mobility liner after hip dislocation]

Intraprosthetic dislocation (IPD) during closed reduction in primary total hip arthroplasty (THA) with a dual mobility cup (DMC) is a well-known, but rare complication. DMC accounted for 15% of all cups in primary THA in Denmark in 2018, and the prevalence of DMC is increasing. We present a case report of an 83-year-old man, who had an atraumatic hip dislocation five weeks after primary THR. After closed reduction with sedation in the emergency department, IPD occurred. We recommend repositioning of a dislocated THA with DMC to be done by use of fluoroscopy under general anesthaesia with muscle relaxation.