Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Arthroplasty - Hip
Abstract number: 24504
THE TITANIUM DUAL MOBILITY CUP, WITH MORE THAN TEN YEARS FOLLOW
UP
Remi PHILIPPOT 1 , Jean CAMILLERI 2 , Frederic FARIZON 1
1 CHU Saint Etienne, Saint Etienne (FRANCE), 2 Hopital Nord, Saint Etienne
(FRANCE)
The concept of stainless steel dual mobility cups in total hip arthroplasty has
demonstrated very low long-term instability rates and a 98% survival rate after 12
years. We systematically implanted titanium alloy acetabular cups during a one year
period. The purpose of our retrospective study was to report the 18-year clinical
outcome data in a homogeneous and continuous series of 103 primary total hip
replacements after implantation of a cementless titanium cup. All patients were
implanted with NOVAE Ti (SERF®) cups made of titanium alloy combined with a
retentive polyethylene liner and a 22.2 mm cobalt chrome prosthetic head. Mean
patient age at the time of surgery was 53 years. All patients were clinically and
radiographically evaluated. The overall 18-year actuarial cup survival rate with a 95%
confidence interval was 87.4%. At last follow-up, there was no evidence of implant
instability whereas acetabular aseptic loosening was reported in one case and high
wear of the retentive liner in 9. The results of this investigation confirmed the longterm
stability of dual-mobility implants. The main limitation of this system was early
wear of the polyethylene liner in contact with the titanium metal back and reaction
with third body along with loss of liner retentivity. In our study, titanium demonstrated
favourable osteointegration properties but poor tribologic characteristics, therefore
suggesting its interest at the bone-cup interface only.
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