Double Mobility Cup in Primary Total Hip Arthroplasty: Dislocation Rate and Survivorship in Single Institution Cohort Analysis

Bedencic Klemen^*, Kavcic Gregor, Bajuk Matevz, Mirt Pika, Gosnik Bostjan, Tumpej Jure & Ivka Branimir

Department of Orthopaedics, General Hospital Novo Mesto Smihelska cesta, Slovenia

Dr. Bedencic Klemen, Department of Orthopaedics, General Hospital Novo Mesto Smihelska cesta, Slovenia.

Keywords: Hip Arthroplasty; Cohort Analysis; Fracture

Abstract

The dual mobility cup was introduced in France in the 1970s by Gilles Bousquet to decrease dislocation rates in high-risk patients. The system acts as a large prosthetic femoral head, allowing grater range of motion within the socket and low dislocation risk. Concerns about intra-prosthetic dislocation and accelerated wear have been emphasized.
Methods
From March 2004 to February 2019 we implanted 1651 DMCs in 1509 patients. Follow up was from 1 month to 160 months. Average age of patients was 75.6 years (from 29 to 98). 1032 were females and 477 males. In 402 cases operation was due to fracture of the femoral neck, in 1103 due to osteoarthritis. Operations were performed by 7 different surgeons using 3 different approaches. We used six different types of femoral stem. Post-operatively patients were mobilized next day after surgery or when the general health condition allowed it. We did not restrict any activities, that are usually forbidden in the early post-operative time after total hip arthroplasty. In all patients, excluding those with acute fracture, Harris Hip Score was measured pre-operatively and postoperatively.

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