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Related Experiment Video

Updated: Jul 10, 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

Accuracy considerations in navigated cup placement for total hip arthroplasty.

U Langlotz1, P A Grützner, K Bernsmann

  • 1mNemoscience, Obach-Palenberg, Germany.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|November 21, 2007
PubMed
Summary

Computer assisted orthopaedic surgery (CAOS) improves acetabular cup placement accuracy in total hip arthroplasty. A hybrid navigation system combining image-free and fluoroscopic technology demonstrated high precision in clinical trials.

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Area of Science:

  • Orthopaedic Surgery
  • Medical Technology
  • Surgical Navigation

Background:

  • Acetabular component malpositioning is a significant issue in total hip arthroplasty (THA).
  • Computer-assisted orthopaedic surgery (CAOS) technologies aim to enhance surgical accuracy and patient outcomes.
  • Existing navigation systems include CT-based, fluoroscopy-based, and image-free approaches.

Purpose of the Study:

  • To comprehensively analyze the accuracy of computer-assisted acetabular cup placement.
  • To evaluate a hybrid navigation approach combining image-free and fluoroscopic technologies for THA.
  • To compare in vitro, mathematical, and in vivo data for accuracy assessment.

Main Methods:

  • A hybrid navigation approach utilizing pointer-based digitization and bi-planar fluoroscopy was employed.

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The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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Last Updated: Jul 10, 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 Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve

Published on: September 7, 2022

  • Mathematical modeling, in vitro testing, and an in vivo clinical trial were conducted.
  • Accuracy was assessed by measuring deviations in cup inclination and anteversion.

    • Main Results:

    • In vitro testing showed maximum deviations of 3.6° for inclination and 3.8° for anteversion.
    • The maximum difference between intraoperative and postoperative measurements was 4° for inclination and 5° for anteversion.
    • Statistical simulations confirmed these findings under worst-case scenarios.

    Conclusions:

    • The hybrid navigation system provides accurate acetabular cup placement, reducing variability within the surgical safe zone.
    • Proper utilization of CAOS technology can improve THA outcomes.
    • Surgeons must be aware of potential error sources and learning curves associated with CAOS implementation.