Table of Contents
ISRN Orthopedics
Volume 2013, Article ID 629201, 4 pages
Clinical Study

Trilogy-Constrained Acetabular Component for Recurrent Dislocation

Department of Orthopedic Surgery, Gentofte Hospital, Niels Andersens Vej 65, 2900 Hellerup, Denmark

Received 19 November 2012; Accepted 25 December 2012

Academic Editors: C.-H. Lee and G. Papachristou

Copyright © 2013 Annette Vest Andersen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


32 patients received a Trilogy- or Trilogy-Longevity-constrained acetabular liner for recurrent dislocations after total hip replacement. The constrained liner was inserted into a well-fixed Trilogy acetabular shell with snap fit. At 1.8-year followup (range 3–63 months), 4 patients had suffered further dislocation(s) (12%), and one patient had revision surgery for a loosened acetabular shell. Radiologic evaluation detected no definitively loose components, but one patient with progressing radiolucent lines around the femoral component and one patient with an acetabular cyst were found, as well as a patient with a loose locking ring (but otherwise no failure). The nineteen patients who were available for the present followup had a mean Harris Hip Score of 81. The constrained liner is an effective method of dealing with recurrent dislocations in well-fixed components.