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The constrained acetabular component for hip instability

Riaz J K Khan1, Daniel Fick, Renuka Alakeson

  • 1Sir Charles Gairdner Hospital, Perth, WA, Australia.

The Journal of Arthroplasty
|April 3, 2007
PubMed

Insights

The constrained acetabular component effectively treats hip instability during revision surgery. However, this study found a higher aseptic loosening rate than previously reported.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Hip instability is a significant complication following revision arthroplasty.
  • Constrained acetabular components are utilized to address instability.
  • Assessing prosthesis migration is crucial for evaluating implant performance.

Purpose of the Study:

  • To evaluate the efficacy of the constrained acetabular component in preventing dislocation in revision hip arthroplasty.
  • To assess prosthesis migration using radiostereometric analysis (RSA).
  • To determine the rate of aseptic loosening associated with this implant.

Main Methods:

  • Retrospective analysis of 104 hips in 107 patients undergoing revision hip arthroplasty with a constrained cup.
  • Radiostereometric analysis (RSA) was employed to measure component migration.
  • Follow-up averaged 3.0 years, with clinical and radiographic assessments.

Main Results:

  • Five patients required revision surgery due to cup loosening, with an additional four showing radiographic evidence of loosening.
  • Three dislocations and three dissociations occurred in five patients.
  • RSA indicated mean cup migration of up to 0.82 mm translation and 1.58 degrees rotation at 24 months.

Conclusions:

  • The constrained acetabular component demonstrates high effectiveness in managing hip instability during revision arthroplasty.
  • A higher-than-anticipated rate of aseptic loosening was observed with this implant.
  • Further investigation into the long-term aseptic loosening rates is warranted.

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