Dissociation of Cemented Dual Mobility Socket from the Acetabulum in A Case of Recurrent Total Hip Arthroplasty Instability -A Novel Complication.

Introduction: Acute complete dissociation of a cemented socket from the acetabular cavity is very rare and has been described only in relation to closed reduction maneuver of a dislocated hip arthroplasty.

Case Report: We present a case of recurrent hip dislocation in a 70-year-old female post total hip arthroplasty for which a cemented dual mobility (DM) component was used. The cemented socket dissociated from the acetabular cavity with the polyethylene liner insitul-year post- surgery. It was not related to intraprosthetic dislocation as the acetabular liner-socket interface was not disrupted. A re-revision of the acetabular component was done with an acetabular reinforcement cage, cemented cup, and constraint acetabular liner. No such case of cup dissociation has been reported in the literature till date.

Conclusion: The use of cemented DM cups without acetabular reinforcement devices has been described recently and is still controversial. Surgeons should be aware of the possibility of such a complication when using metal-backed cemented DM cups.