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Pelvic tilt makes acetabular cup navigation inaccurate.

Burkhard Lembeck1, Otto Mueller, Patrik Reize

  • 1Department of Orthopaedic Surgery, University of Tuebingen, Germany. burkhard.lembeck@med.uni-tuebingen.de

Acta Orthopaedica
|October 1, 2005
PubMed
Summary

Pelvic tilt significantly impacts acetabular cup positioning, making navigation systems that rely on the anterior pelvic plane inaccurate. Understanding pelvic tilt variations is crucial for precise surgical outcomes.

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Area of Science:

  • Orthopedic surgery
  • Surgical navigation
  • Biomechanical analysis

Background:

  • Modern navigation systems enable precise acetabular cup placement relative to the anterior pelvic plane.
  • Variations in pelvic tilt can alter the final spatial orientation of the acetabular cup during surgery.

Purpose of the Study:

  • To quantify the effect of pelvic tilt on acetabular cup positioning.
  • To assess the accuracy of navigation systems referencing the anterior pelvic plane under varying pelvic tilt conditions.

Main Methods:

  • Pelvic tilt was measured in 30 volunteers using an inclinometer and ultrasonographic system.
  • A mathematical algorithm was developed to calculate resultant cup position from standard radiographs based on pelvic tilt.

Main Results:

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  • Average resting pelvic tilt was -4° (lying) and -8° (standing), with a range of -27° to +3°.
  • A 1° pelvic reclination resulted in approximately 0.7° of functional cup anteversion.

Conclusions:

  • Pelvic tilt introduces inaccuracies in navigation systems that use the anterior pelvic plane as a reference.
  • Accurate acetabular cup placement requires consideration of patient-specific pelvic tilt.