Clinical Study Trilogy-Constrained Acetabular Component for Recurrent Dislocation

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 aer total hip replacement. e constrained liner was inserted into a well-�xed Trilogy acetabular shell with snap �t. 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 de�nitively 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). e nineteen patients who were available for the present followup had a mean Harris Hip Score of 81. e constrained liner is an effective method of dealing with recurrent dislocations in well-�xed components. 1