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Related Experiment Videos

The use of a constrained acetabular component for recurrent dislocation.

Gary S Shapiro1, Daniel E Weiland, David C Markel

  • 1Illinois Bone and Joint Institute, 2401 Ravine Way, Glenview, IL 60025, USA.

The Journal of Arthroplasty
|May 3, 2003
PubMed
Summary

Constrained acetabular components significantly reduced recurrent dislocations after total hip arthroplasty (THA). However, cemented liner dissociation necessitates avoiding this fixation method for improved hip instability outcomes.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Reconstructive Surgery

Background:

  • Chronic instability after total hip arthroplasty (THA) presents a significant clinical challenge.
  • Surgical interventions for THA instability have historically yielded suboptimal results.
  • Constrained acetabular components were developed to address recurrent dislocations.

Purpose of the Study:

  • To retrospectively evaluate the efficacy of constrained acetabular components in managing recurrent instability following THA.
  • To assess the dislocation and revision rates associated with these components.

Main Methods:

  • Retrospective review of 87 patients who received constrained acetabular components for recurrent hip instability.
  • Follow-up evaluation of 85 hips with an average follow-up of 58 months (minimum 3 years).

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  • Analysis of dislocation events, component failures, and revision surgeries.

    • Main Results:

    • A low recurrent dislocation rate of 2.4% was observed.
    • Component revision was required in 8.2% of cases (4 acetabular, 1 femoral).
    • Recurrent dislocations were exclusively linked to cemented liner dissociation from well-fixed shells.

    Conclusions:

    • Constrained acetabular components offer a significant improvement in reducing recurrent dislocations after THA compared to other methods.
    • The mode of fixation, specifically cemented liner dissociation, is a critical factor influencing outcomes.
    • Cemented liner fixation is not recommended due to the risk of dissociation and subsequent instability.