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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

The Orthopilot navigation system for primary Bicontact total hip replacement.

H Kiefer1, A Othman

  • 1Department of Trauma and Orthopaedic Surgery, Lukas Hospital, Hindenburgstrasse 56, Bünde, Germany. h.kiefer@lukas-krankenhaus.de

Zeitschrift Fur Orthopadie Und Unfallchirurgie
|November 21, 2007
PubMed
Summary

Navigated hip replacement surgery using the Orthopilot system provides reproducible results for implant positioning. This navigation technology enhances accuracy in component placement and leg length restoration during total hip arthroplasty (THA).

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Area of Science:

  • Orthopedic Surgery
  • Medical Navigation Technology
  • Biomechanical Engineering

Background:

  • Traditional total hip arthroplasty (THA) relies on manual techniques, which can lead to variability in component positioning and patient outcomes.
  • Navigated implantation offers the potential for enhanced precision and data acquisition during joint reconstruction procedures.

Purpose of the Study:

  • To evaluate the reproducibility and accuracy of navigated implantation for both cup and stem components in cementless THA.
  • To assess the reliability of intraoperative navigation data compared to postoperative radiographic analysis.

Main Methods:

  • Analysis of 107 consecutive cementless THA procedures using Orthopilot Software THA 2.0.
  • Comparison of preoperative planning with intraoperative navigation data and postoperative radiographs for cup inclination/anteversion, leg length, offset, and stem rotation.

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Last Updated: Jul 10, 2026

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  • Utilized a femoral transmitter for precise measurement near the hip joint.

    • Main Results:

    • Radiological cup positions achieved high accuracy, with 98% within +/- 10 degrees of target inclination and all within +/- 10 degrees of anteversion.
    • Leg length changes were recorded with +/- 5 mm accuracy in 83% of cases.
    • Bicontact stem positioning accuracy was within +/- 5 degrees in 77% of operations, with 73% of arthroplasties showing relative offset changes within +/- 10 mm.

    Conclusions:

    • Navigated implantation of hip arthroplasty components ensures reproducible results and aligns with clinical expectations for leg length and offset.
    • While navigation enhances accuracy, standard radiographic analysis may not be sufficiently precise for all measured parameters.
    • The use of a femoral transmitter close to the joint contributes to reliable outcomes in navigated THA.