A Way to Eliminate Luxation After Primary Hip Replacement - a Single Centre Experience with 1000 Cases of Dual Mobility Cups

Klemen Bedencic^*, Gregor Kavcic & Jure Tumpej

Department of Orthopaedics, General Hospital Novo Mesto Šmihelska Cesta, Slovenia

Dr. Klemen Bedencic, Department of Orthopaedics, General Hospital Novo Mesto Šmihelska Cesta, Slovenia.

Keywords: Luxation After THA; Aseptic Loosening; Dual Mobility Cup

Abstract

Introduction and Methods
We analysed a series of 1000 consecutive dual mobility cups used for THA in 901 patients for various pathologies (fracture of the femoral neck, osteoarthritis and avascular necrosis). There were 612 females and 289 males with a mean age of 76.8 years at the time of their operation (from 29 to 98). 808 patients with a total of 883 dual mobility cups were available for the final analysis.     
Results
There were no dislocations recorded at the mean follow-up of 8,9 years. There were also no cases of aseptic loosening (longest follow up 14 years). Harris Hip Score has significantly increased for cases of osteoarthritis and avascular necrosis (from 44,9 to 90,4). We recorded 9 (1%) deep prosthetic joint infection, 1 femoral nerve palsy, 10 (1,1%) periprosthetic fractures and 1 case of acute thromboembolic event.
Conclusions
Our results confirm the benefits of dual mobility cups regarding prevention of luxation. We found no difference in luxation rate between different approaches when using dual mobility cups. We have not encountered the problem of early aseptic loosening thought to be associated with dual mobility design. Other complication rates were comparable to those occurring with standard acetabular designs.

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