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Comparison of cemented vs uncemented acetabular component positioning using an imageless navigation system.

Mayur Chawda1, Peter Hucker, Sarah L Whitehouse

  • 1The Prince Charles Hospital, Queensland University of Technology, Brisbane, Queensland, Australia.

The Journal of Arthroplasty
|December 6, 2008
PubMed
Summary

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This study found cemented acetabular components in total hip arthroplasty offer superior reproducibility in placement compared to uncemented components. This difference may reduce revision rates for dislocation with cemented implants.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • Accurate acetabular component placement is crucial for successful total hip arthroplasty (THA).
  • Variability in placement can lead to complications such as dislocation and leg length discrepancy.
  • Comparing cemented and uncemented components regarding placement accuracy is essential for optimizing THA outcomes.

Purpose of the Study:

  • To compare the reproducibility of acetabular component placement between cemented and uncemented implants in THA.
  • To assess the accuracy of achieving target inclination and version using hip navigation.
  • To evaluate deviations in leg length between cemented and uncemented THA groups.

Main Methods:

  • Hip navigation was employed as an assessment tool for acetabular component placement.

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  • Two groups were compared: cemented and uncemented acetabular components.
  • Deviations from planned inclination, version, and leg length were quantified and analyzed.

    • Main Results:

    • Uncemented cups showed significantly higher rates of deviation (≥5 degrees) in both inclination (20%) and version (35%) compared to cemented cups (P = .048 and P = .003, respectively).
    • A significant difference in deviation from planned leg length was observed between the cemented and uncemented groups (P < .001).
    • No cemented cups deviated by 5 degrees or more from the target inclination or version.

    Conclusions:

    • Cemented acetabular components demonstrate superior reproducibility in placement accuracy compared to uncemented components during THA.
    • The observed differences in placement accuracy may contribute to the higher revision rates for dislocation associated with uncemented components.
    • Hip navigation is a valuable tool for assessing and improving the precision of acetabular component positioning in total hip arthroplasty.