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Related Experiment Video

Updated: Jul 7, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

The rationale for tilt-adjusted acetabular cup navigation.

Jürgen W Babisch1, Frank Layher, Louis-Philippe Amiot

  • 1Department of Orthopaedics, Friedrich Schiller University Jena at the Rudolf-Elle-Hospital Eisenberg, Klosterlausnitzer Strasse 81, 07607 Eisenberg, Germany.

The Journal of Bone and Joint Surgery. American Volume
|February 5, 2008
PubMed
Summary

Patient positioning significantly impacts pelvic tilt during total hip arthroplasty. A new nomogram accurately adjusts cup alignment for computer navigation, improving surgical outcomes and reducing dislocations.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Traditional total hip arthroplasty (THA) relies on anatomical landmarks for acetabular component alignment.
  • First-generation computer navigation systems use the pelvic anterior plane (PAP) for alignment.
  • Patient positioning can alter pelvic tilt, potentially affecting PAP-based navigation accuracy.

Purpose of the Study:

  • To investigate the effect of patient positioning on pelvic tilt in THA.
  • To assess the impact of pelvic tilt on acetabular cup alignment angles.
  • To develop and validate a method for adjusting cup alignment based on pelvic tilt.

Main Methods:

  • Pelvic anterior plane tilt angle measured via CT scans in supine and standing positions before and after THA.

Related Experiment Videos

Last Updated: Jul 7, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

  • Development of a nomogram using hip navigation planning software for tilt-adjusted cup angles.
  • Validation of the nomogram in 98 patients undergoing navigated THA, with cup alignment assessed by postoperative CT scans.

    • Main Results:

    • Significant changes in pelvic tilt were observed between supine and standing positions, and pre- to post-operatively.
    • The developed nomogram demonstrated good accuracy in achieving target cup abduction (97%) and anteversion (99%) ranges.
    • No dislocations were reported in 98 patients undergoing navigated THA using the nomogram over one year of follow-up.

    Conclusions:

    • A nomogram effectively converts standard cup alignment values to tilt-adjusted targets for PAP-based navigation systems.
    • This method offers accuracy and reproducibility in navigated THA.
    • Future navigation systems should incorporate automatic pelvic tilt measurement and adjustment for enhanced precision.