Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 24505
THE INTEREST OF TOTAL HIP ARTHROPLASTIES USING A DUAL-MOBILITY
SYSTEM IN PATIENTS UNDER 50 YEARS OF AGE.
Remi PHILIPPOT, Bertrand BOYER, Frederic FARIZON
CHU Saint Etienne, Saint Etienne (FRANCE)
Dual-mobility was developed in 1974 and has proven to be performing favourably in
primary THA by reducing the risk of dislocation as well as in revision surgery since it
is considered the treatment of choice in chronic prosthetic instability. The aim of our
study was to assess the 12-year survival rate of dual-mobility cups in a
homogeneous and continuous series of 84 patients under the age of 50. The mean
follow-up period was 12.4 years. Mean patient age at surgery was 39.8 years. The
main diagnosis was primary osteoarthritis. All patients were implanted with NOVAE I
(SERF) dual-mobility cup combined with a cobalt-chromium prosthetic head and a
PROFIL type screwed stem. They were all clinically and radiographically evaluated.
The Postel Merle d’Aubigné score improved from 4.6 preoperatively to 14.1 at last
follow-up. The reported complications at last follow-up included aseptic loosening in 3
cases and high wear of the retentive liner in 2 whereas no case of postoperative
prosthetic instability was observed. The 12-year actuarial cup survival rate was
93.8%.The reported survival rate of non-cemented cups in the literature ranges from
95 to 100%, the NOVAE I (SERF) cup being slightly below these rates. However,
these findings are counterbalanced by the favourable results in terms of
postoperative stability. Therefore, the outcome of our series strongly supports the
use of dual-mobility in patients under 50 years of age with a high risk of postoperative
dislocation.
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