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Computer navigation of the acetabular component: a cadaver reliability study.

J M F Spencer1, R E Day, K E Sloan

  • 1Department of Medical Engineering and Physics, Royal Perth Hospital, 6 Selby Street, Shenton Park, Perth 6008, Western Australia.

The Journal of Bone and Joint Surgery. British Volume
|June 27, 2006
PubMed
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Establishing the anterior pelvic plane for computer-assisted surgery is unreliable, with significant variations in acetabular component anteversion and inclination. Improved registration methods are needed for surgical navigation safety.

Area of Science:

  • Orthopedic surgery
  • Medical imaging
  • Surgical navigation

Background:

  • Imageless computer-assisted navigation is increasingly used in hip arthroplasty.
  • Accurate establishment of the anterior pelvic plane is crucial for component positioning.
  • Current methods rely on palpating bony landmarks, which may introduce variability.

Purpose of the Study:

  • To assess the intra- and inter-observer reliability of establishing the anterior pelvic plane using palpation.
  • To determine the impact of anterior pelvic plane variability on acetabular component version and inclination.
  • To evaluate the accuracy of current landmark registration techniques in computer-assisted surgery.

Main Methods:

  • A cadaver model was utilized with a specialized rod to maintain fixed orientation.

Related Experiment Videos

  • Eight surgeons registered bony landmarks to establish the anterior pelvic plane.
  • The precise anterior pelvic plane was determined using anatomically placed bone screws for reference.
  • Intra- and inter-observer reliability was assessed for version and inclination measurements.

    • Main Results:

    • Significant differences were observed between surgeons in establishing the anterior pelvic plane (p < 0.001).
    • Variability was significantly greater for acetabular component anteversion (sd 9.6°) than inclination (sd 6.3°).
    • The study identified significant inaccuracies in the current method of registering pelvic landmarks.

    Conclusions:

    • The palpation-based method for registering pelvic landmarks is significantly inaccurate for computer-assisted navigation.
    • High variability in acetabular component positioning can result from unreliable anterior pelvic plane establishment.
    • Improved registration techniques are essential to ensure the safety and accuracy of imageless computer-assisted surgical navigation.