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Related Experiment Video

Updated: Jul 14, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
07:43

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy

Published on: July 2, 2021

[TKA kinematics. In vivo techniques and results].

R von Eisenhart-Rothe1, T Vogl, K-H Englmeier

  • 1Asklepios Orthopädische Klinik Lindenlohe, Lindenlohe 18, 92421 Schwandorf. r.eisenhart-rothe@asklepios.com

Der Orthopade
|June 27, 2007
PubMed
Summary

This study used fluoroscopy and functional MRI to analyze knee joint motion after total knee arthroplasty (TKA). Findings reveal altered knee kinematics in TKA patients compared to healthy individuals, impacting implant performance.

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Area of Science:

  • Orthopedics
  • Biomechanical Engineering
  • Medical Imaging

Background:

  • Understanding knee joint kinematics after total knee arthroplasty (TKA) is crucial for improving implant design and patient outcomes.
  • Current methods for assessing TKA motion are limited in their ability to capture complex, in vivo physiological movement patterns.

Purpose of the Study:

  • To present and evaluate fluoroscopy and functional MRI as in vivo imaging techniques for assessing TKA kinematics.
  • To compare the 3D kinematics of healthy knees with those of knees that have undergone TKA.

Main Methods:

  • Dynamic videofluoroscopy was used to analyze knee motion during various activities, with 3D kinematics reconstructed from 2D images.
  • Functional MRI was performed in an open system under load to analyze femoropatellar and femorotibial 3D kinematics at different flexion angles.

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  • Kinematic data from healthy knees (functional MRI) were compared with TKA data (fluoroscopy and functional MRI).

    • Main Results:

    • Functional MRI findings in healthy knees correlated well with dynamic fluoroscopic outcomes.
    • TKAs exhibited an increased external rotation of the femur at full extension and decreased external rotation during flexion compared to healthy knees.
    • Significant differences in femorotibial and femoropatellar kinematics were observed in TKAs, with notable variations between different TKA designs (e.g., posterior stabilized vs. PCL retaining).

    Conclusions:

    • Advanced imaging techniques like fluoroscopy and functional MRI provide valuable insights into in vivo TKA kinematics.
    • Altered kinematics in TKAs may contribute to long-term complications such as aseptic loosening and polyethylene wear.
    • These findings can inform future TKA design improvements to enhance long-term performance and patient function.