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Clinical Orthopaedics and Related Research®

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01-03-2013 | Clinical Research

Intraprosthetic Dislocation: A Specific Complication of the Dual-mobility System

Authors: Remi Philippot, MD, PhD, Bertrand Boyer, MD, Frederic Farizon, MD

Published in: Clinical Orthopaedics and Related Research® | Issue 3/2013

Abstract

Background

The dual-mobility concept was proposed as an alternative to prevent postoperative dislocation events. However, intraprosthetic dislocation (IPD) is a troublesome and specific complication induced by the loss of the polyethylene retentive rim and escape of the femoral head from the polyethylene liner. The factors associated with IPD are unknown as only isolated cases have been reported and do not provide a clear understanding of the mechanisms of failure.

Questions/purposes

We therefore (1) identified features related to different types of IPD and (2) determined factors related to the timing of IPD.

Methods

We identified 81 cases (80 patients) with IPD from among 1960 primary THAs performed between January 1985 and December 1998. To classify the types of IPD we considered perioperative (presence of arthrofibrosis, cup loosening, and type of liner wear) and radiographic (radiographic cup loosening or migration, and ossification) features.

Results

We identified three types of IPD with the following causal mechanisms: Type 1 was pure IPD without arthrofibrosis and without cup loosening (n = 26), Type 2 was IPD secondary to blocking of the liner (n = 41), and Type 3 was IPD associated with a cup loosening (n = 14). The mean times of onset were, 11, 8, and 9 years after THA, respectively. We found no difference according to the stem design regarding timing of the IPD.

Conclusions

This new IPD classification allows clinicians to anticipate the possible conditions they will encounter with revision surgery and plan surgery (cup removal, liner exchange, synovectomy). The implant characteristics and this new classification accounted for the differences in the timing of occurrence.

Level of Evidence

Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.

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Title: Intraprosthetic Dislocation: A Specific Complication of the Dual-mobility System
Authors: Remi Philippot, MD, PhD
Bertrand Boyer, MD
Frederic Farizon, MD
Publication date: 01-03-2013
Publisher: Springer-Verlag
Published in: Clinical Orthopaedics and Related Research® / Issue 3/2013
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI: https://doi.org/10.1007/s11999-012-2639-2

At a glance: The STEP trials

Springer Medicine

Intraprosthetic Dislocation: A Specific Complication of the Dual-mobility System

Abstract

Background

Questions/purposes

Methods

Results

Conclusions

Level of Evidence

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Questions/purposes

Methods

Results

Conclusions

Level of Evidence

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