Cemented dual mobility cup for primary total hip arthroplasty: survival and quality of life. A multicenter study

Introduction: Dual mobility cups are characterized by having a prosthetic head inside a polyethylene core that later articulates with a metal cup implanted in the acetabulum. These cups can be cemented or uncemented. This study aimed to determine the survival of a cemented dual-mobility cup (CDMC) with a cobalt-chromium head (CoCr) and the quality of life (QOL) of operated patients. Methodology: Multicenter historical cohort study where survival and QOL were estimated. The cohort includes patients who underwent a primary total hip arthroplasty (THA) with a CDMC and CoCr head. The patients were operated on between 2011 and 2013. Results: 40 patients from 6 institutions with a median age of 81 (IQR 22.25) years. The results in the Kaplan-Meier estimation showed a survival of 94.2% (95% CI [86.6% – 100%]) at 5 years and a maximum follow-up of 9.5 years. Three failures occurred (two dislocations and one mechanical loosening), and Oxford Hip Scale (OHS) of 41.5 (IQR 10.50) points was recorded. Conclusions: In terms of survival and the score obtained in the OHS, the CDMC has comparable results with the scientific literature found on uncemented dual mobility cups. This demonstrates adequate results in patients with a maximum follow-up of 9.5 years.