156.
Low Dislocation Rate of Saturne® Dual-Mobility THA after Medial
Femoral Neck Fracture. A Retrospective Study of 205 hips with a
minimum 2.5 year follow-up.
Steffan Tabori Jensen, Maiken Stilling, Søren Bøvling, Torben Bæk Hansen,
Morten Homilius, Christina Frølich
ortopædkirurgisk HospitalsEnheden Vest, HEV; ortopædkirurgisk,
HospitalsEnheden Vest, HEV; ortopædkirurgisk, HospitalsEnheden Vest,
HEV; ortopædkirurgisk, HospitalsEnheden Vest, HEV; ortopædkirurgisk,
HospitalsEnheden Vest, HEV; ortopædkirurgisk, HospitalsEnheden Vest,
HEV
Background:
Displaced medial femoral neck fracture (FNF) may be treated
with primary arthroplasty, however dislocation is a serious complication.
Large head-size dual- mobility (DM) total hip systems may increase range of
motion to impingement and may thereby improve stability compared with
conventional hip implants.
Purpose / Aim of Study:
To investigate the dislocation and revision rate of
primary DM cups in patients with acute FNF.
Materials and Methods:
Since 2005 we used Saturne® DM articulation as
standard treatment for displaced medial FNF. 205 consecutive patients (154
women) at a mean age of 78 years (range 30-98) were operated with SDM by
residents and consultants by use of the posterior-lateral approach (PLA). We
retrospectively evaluated all patient files and the digital x-ray archive for any
incident of dislocation and revision until death of the patient or June 2012. The
National Patient Registry will also be checked. Educational level of the
surgeon was noted. Measurements of cup position are currently on-going.
Findings / Results:
At a minimum 2.5 year follow-up there were 11 (5%)
dislocations and 5 (2%) revisions. 82 patients (40%) died. The mean duration
until dislocation was 17 days (range 1-60) and the number was between 1 and
3.
Mean time until revision was 21 days (range 8-41). The educational level of
the surgeon was unrelated to the dislocation risk (p=0.17) and revision risk
(
p=0.45). 44 stems (21%) and 65 cups (32%) were fixed with cementless
technique and this did not jeopardize the risk of dislocation or revision
(
p>0.06). Evaluation of correlations between cup position and dislocation and
revision are on- going.
Conclusions:
We conclude that the use of a cemented or cementless dual-
mobility Saturne® hip system inserted via a PLA results in a low dislocation
and revision rate regardless if the surgeon is in training or specialized.
