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Patellar alignment evaluated by MRI

T Muellner1, M Funovics, A Nikolic

  • 1University Clinic of Traumatology, University of Vienna Medical School, Austria. tmuellner@csi.com

Acta Orthopaedica Scandinavica
|December 17, 1998
PubMed
Summary
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Assessing patellar joint alignment using MRI reveals that the bony congruence angle accurately reflects articular cartilage surface, unlike bony sulcus and lateral patellofemoral angles.

Area of Science:

  • Orthopedics
  • Radiology
  • Biomechanics

Background:

  • Patellofemoral joint pain is common.
  • Accurate assessment of patellar alignment is crucial for diagnosis and treatment.
  • Understanding the relationship between bony structures and articular cartilage is key.

Purpose of the Study:

  • To analyze the congruence between articular cartilage and subchondral bone in the patellar joint.
  • To evaluate the reliability of bony angles in representing cartilage surface characteristics.

Main Methods:

  • Magnetic Resonance Imaging (MRI) of the patellar joint in 20 volunteers.
  • Measurements taken at 20 and 45 degrees of knee flexion.
  • Analysis of sulcus, congruence, and lateral patellofemoral angles.

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Main Results:

  • Significant differences were found between bony and cartilaginous sulcus and lateral patellofemoral angles at both flexion degrees.
  • The bony congruence angle demonstrated a strong correlation with the articular cartilage surface.

Conclusions:

  • Bony sulcus and lateral patellofemoral angles are not reliable indicators of articular cartilage surface or thickness.
  • The bony congruence angle serves as a valuable indicator of patellar centralization and cartilage congruence.