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Imaging knee position using MRI, RSA/CT and 3D digitisation.

A McPherson1, J Kärrholm, V Pinskerova

  • 1Centre For Biomedical Engineering, UCL (RNOHT) London, UK. andy@kneemotion.org

Journal of Biomechanics
|December 16, 2004
PubMed
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Three imaging methods accurately capture knee joint position in cadavers. Magnetic Resonance Imaging (MRI) may offer the best results for live patients.

Area of Science:

  • Orthopedics
  • Biomedical Engineering
  • Radiology

Background:

  • Accurate knee joint imaging is crucial for diagnosing and treating knee pathologies.
  • Understanding knee kinematics requires precise measurement of joint position and rotation.
  • Existing imaging techniques may have limitations in accuracy or accessibility.

Purpose of the Study:

  • To compare the accuracy of three distinct imaging methods for capturing knee joint position.
  • To evaluate Magnetic Resonance Imaging (MRI), Radiostereometric Analysis (RSA) with Computed Tomography (CT), and 3D digitization for knee imaging.
  • To determine the most reliable method for in vitro and potentially in vivo knee position analysis.

Main Methods:

  • Fresh cadaver knees were imaged at six flexion angles (0-120 degrees) using MRI, RSA+CT, and 3D digitization.

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  • Virtual models of 42 distinct knee positions were generated using specialized software.
  • Anatomically based Cartesian coordinate systems were used to align virtual models for kinematic analysis.

    • Main Results:

    • All three imaging methods demonstrated equal and adequate accuracy for in vitro knee position assessment.
    • Angular rotations around coordinate system axes were calculated directly from aligned virtual models.
    • Anatomy-based diagrams effectively depicted the three rotational movements for each imaging method.

    Conclusions:

    • The three evaluated imaging techniques (MRI, RSA+CT, 3D digitization) are comparably accurate for in vitro knee imaging.
    • Magnetic Resonance Imaging (MRI) shows potential for superior utility in in vivo (live patient) knee position assessment.
    • Further research may validate MRI's advantages for clinical applications in knee kinematics.