DOS BULLETIN - Dansk Ortopædisk Selskab

2010-378_DOS nr. 3 2010 29/09/10 10:08 Side 115
10 year follow-up of cemented Bimetric® titanium
stem in Total Hip Arthroplasty (THA)
Peter Heide Pedersen, Gitte Broholm Hansen, Poul T. Nielsen,
Mogens Berg Laursen
Ortopædkirurgien Nordjylland
Background: Reports on the long-term results of cemented titanium
femoral stems in THA have been conflicting. Many authors describe early
aseptic loosening and revision rates of up to 25%, whilst others
describe good long-term survival.
Purpose: The aim of our study was to show the 10 year follow-up results
of the cemented Bimetric® titanium stem in THA with regards to aseptic
loosening, stem migration and clinical outcome.
Methods: Retrospectively a cohort of 362 patients (227 women and 135
men) with unilateral THAs operated between Oct. 1991 and Dec.1997
was defined. 136 were available for a clinical and radiological 10 year
follow-up examination. For the remainder data were extracted from the
patient records. In all cases the cemented Bimetric® titanium stem was
used, and cemented with 3rd generation cementing technique, aiming for
a 2 mm cement mantle, using a distal centralizer. The mean age at the
time of surgery was 74 (range 29-92) years.
Findings: 226 (62.4 %) patients died before 10 year follow-up. A part of
these had sufficient data registered for calculating preoperative and 1
year postoperative Harris Hip Scores. Stem survival in this group was
220/226(97.3%). At 10 year follow-up 136 patients were alive, and 64
patients (47.1%) took part in clinical and radiological controls, mean
observation time 11.4 years. 1 patient was revised due to aseptic loosening,
making the survivorship of femoral stems in this group 98.4%. Harris
Hip Score was good or excellent in 71.9% (46/64) and satisfactory in
21.9%, 2 patients (3.1%) were not satisfied.
Conclusion: From our mid term results it seems that good long-term
results can be achieved with the cemented Bimetric® titanium stem,
with a survival rate of 98.4% at 11.4 years.
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