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Related Experiment Video

Updated: May 17, 2026

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

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In Vitro Hip Biomechanical Positioning Device Integrated with Clinical Imaging.

Mohammadreza Kheshti1, Tom Chmiel2, Richard J van Arkel3

  • 1School of Biomedical Engineering, Western University, London, Ontario, Canada; Robarts Research Institute, Western University, London, Ontario, Canada.

Journal of Biomechanics
|May 15, 2026
PubMed
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This summary is machine-generated.

Researchers developed a 3D-printed, radiolucent hip biomechanics testing fixture. This low-cost device enables accurate, artifact-free validation of joint mechanics using computed tomography (CT) imaging.

Area of Science:

  • Biomechanics
  • Orthopedic Surgery
  • Medical Imaging

Background:

  • In vitro hip biomechanics studies are limited by the lack of radiolucent testing platforms.
  • Existing methods struggle to validate joint mechanics against clinical imaging without metal artifacts.

Purpose of the Study:

  • To develop a low-cost, non-ferrous, radiolucent testing fixture for hip biomechanics.
  • To enable alignment of benchtop loading with International Society of Biomechanics (ISB) recommendations.
  • To facilitate artifact-free validation of joint mechanics using computed tomography (CT).

Main Methods:

  • A 3D-printed (tough polylactic acid - PLA) testing fixture and drill guide were developed.
  • The device allowed controlled flexion-extension and internal-external rotation (IR-ER) with a torque meter.
Keywords:
Hip BiomechanicsISBCoordinateSystemImagingInVitroTesting Device

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  • Twenty cadaveric hips were tested, and reliability was assessed using CT imaging and Bland-Altman analysis.

    • Main Results:

    • The fixture demonstrated high accuracy in positioning: 1.8 ± 1.4% in flexion-extension and 7.3 ± 3.2% in IR-ER.
    • Excellent reliability was found between image-based and device measurements (ICCrotation = 0.98; ICCflexion = 0.99).
    • Exceptional repeatability (ICC ≥ 0.99) and strong clinical agreement were confirmed.

    Conclusions:

    • The imaging-compatible device offers a robust, standardized platform for hip biomechanics research.
    • It facilitates quantitative evaluation of joint stability and surgical interventions.
    • Provided CAD models enable widespread fabrication and setup.