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Trilogy-constrained acetabular component for recurrent dislocation.

Annette Vest Andersen1, Anne Grete Kjersgaard1, Søren Solgaard1

  • 1Department of Orthopedic Surgery, Gentofte Hospital, Niels Andersens Vej 65, 2900 Hellerup, Denmark.

ISRN Orthopedics
|June 27, 2014
PubMed
Summary

Constrained acetabular liners effectively manage recurrent dislocations after total hip replacement. This study shows good outcomes for patients with well-fixed components, despite a low rate of further dislocations.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Reconstructive Surgery

Background:

  • Recurrent dislocations pose a significant challenge following total hip replacement (THR).
  • Existing treatment options for recurrent dislocations can be limited.
  • Constrained acetabular liners offer a potential solution for instability in THR.

Purpose of the Study:

  • To evaluate the efficacy of Trilogy- or Trilogy-Longevity-constrained acetabular liners in patients experiencing recurrent dislocations after THR.
  • To assess the functional outcomes and complication rates associated with these constrained liners.

Main Methods:

  • A retrospective study of 32 patients who received constrained acetabular liners for recurrent dislocations.
  • Liners were inserted into well-fixed Trilogy acetabular shells using a snap-fit mechanism.
  • Follow-up included clinical assessment (Harris Hip Score) and radiographic evaluation.

Main Results:

  • A low rate of further dislocations (12%) was observed post-implantation.
  • One patient required revision surgery for an acetabular shell loosening.
  • Radiographic findings included one case of a loose locking ring and other minor findings, with no definitively loose components.

Conclusions:

  • Constrained acetabular liners are an effective method for managing recurrent dislocations in total hip replacement patients with well-fixed components.
  • The use of these liners demonstrates a favorable outcome in preventing further instability.
  • Further investigation into long-term component fixation and potential complications is warranted.