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Related Experiment Videos

Constrained acetabular components

M J Anderson1, W R Murray, H B Skinner

  • 1Department of Orthopaedic Surgery, University of California, San Francisco.

The Journal of Arthroplasty
|February 1, 1994
PubMed
Summary
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Constrained acetabular components effectively reduced dislocations in revision total hip arthroplasty patients. However, a high abduction angle of the acetabular cup predicted failure in some cases.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Revision total hip arthroplasty (THA) is complex, often involving instability.
  • Chronic dislocation is a significant complication following THA.

Purpose of the Study:

  • To evaluate the efficacy of constrained acetabular components in revision THA.
  • To identify factors predicting the success or failure of these components.

Main Methods:

  • Retrospective review of 21 patients undergoing revision THA with constrained acetabular components.
  • Minimum 2-year follow-up assessing dislocation, subluxation, and Harris hip scores.
  • Radiographic analysis to identify factors associated with component failure.

Main Results:

  • 71% of patients (15/21) achieved stability post-implantation.

Related Experiment Videos

  • Eight dislocations occurred in 6 patients (29%).
  • Increased acetabular cup abduction angle (>70 degrees) was the sole predictor of failure (P < .05).
  • No loosening observed in 19 porous ingrowth components.

    • Conclusions:

    • Constrained acetabular components can successfully manage severe hip instability in revision THA.
    • Careful attention to acetabular component positioning, particularly abduction angle, is crucial for optimal outcomes.
    • While effective for many, this solution is not universally successful.