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A more reliable method to assess acetabular component position.

John V Tiberi1, Nicholas Pulos, Michael Kertzner

  • 1Department of Orthopaedic Surgery, Harbor-UCLA Medical Center, 1000 West Carson Street, Box 422, Torrance, CA 90509, USA. jvtiberi@gmail.com

Clinical Orthopaedics and Related Research
|August 9, 2011
PubMed
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The new ischiolateral method and EBRA (Einzel-Bild-Roentgen-Analyse) reliably assess acetabular component position, outperforming the Woo and Morrey method. This simplifies accurate measurement for improved joint function and reduced wear.

Area of Science:

  • Orthopedic surgery
  • Radiographic imaging
  • Biomedical engineering

Background:

  • Acetabular component positioning impacts joint function and wear.
  • Current radiographic methods for assessing acetabular version lack reliability.
  • Existing reliable techniques are time-consuming or require specialized equipment.

Purpose of the Study:

  • Compare the reliability of three acetabular component position assessment methods.
  • Evaluate the ischiolateral method against EBRA and Woo and Morrey techniques.
  • Determine a simple and reliable method for assessing axial component position.

Main Methods:

  • Assessed axial component position in 52 hips using multiple radiographic series.
  • Utilized Einzel-Bild-Roentgen-Analyse (EBRA) for component version.

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  • Employed the Woo and Morrey method and a novel ischiolateral method on true lateral radiographs, using the ischium as a landmark.

    • Main Results:

    • The ischiolateral (SD 2.15°) and EBRA (SD 2.06°) methods showed lower variability than Woo and Morrey (SD 3.65°).
    • Fewer hip series (11.5%) using ischiolateral and EBRA had >4° SD compared to Woo and Morrey (36.5%).
    • Intraclass correlation coefficients for intra- and interobserver reliability were identical (0.9) for ischiolateral and EBRA methods.

    Conclusions:

    • The ischiolateral method offers a simple, reliable approach to assess axial component position.
    • Standardizing pelvic position using the ischium improves radiographic assessment reliability.
    • This method serves as a surrogate for planar anteversion measured by EBRA, enhancing surgical outcomes.