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Related Experiment Videos

Prior lateral patellar dislocation: MR imaging findings

E Lance1, A L Deutsch, J H Mink

  • 1Department of Radiology, Harbor/University of California Los Angeles Medical Center.

Radiology
|December 1, 1993
PubMed
Summary
This summary is machine-generated.

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Magnetic resonance (MR) imaging can reveal signs of prior patellar dislocation, including hemarthrosis and specific bone and soft tissue injuries. Axial STIR sequences are particularly useful for detecting subtle abnormalities in acutely injured knees.

Area of Science:

  • Radiology
  • Orthopedic Imaging
  • Knee Biomechanics

Background:

  • Patellar dislocation is a common knee injury.
  • Accurate diagnosis of prior patellar dislocation is crucial for appropriate management.
  • Magnetic resonance (MR) imaging is a key modality for evaluating knee injuries.

Purpose of the Study:

  • To identify and illustrate the characteristic magnetic resonance (MR) imaging findings suggestive of previous patellar dislocation.
  • To enhance the diagnostic accuracy of MR in detecting subtle signs of patellar instability.

Main Methods:

  • Retrospective review of 22 knee MR examinations with a diagnosis of patellar dislocation.
  • Analysis of imaging findings including hemarthrosis, retinacular disruption, and bone contusions.

Related Experiment Videos

  • Comparison of axial short-inversion-time inversion-recovery (STIR) images with T2-weighted images.

    • Main Results:

    • 82% of cases showed hemarthrosis, medial retinacular disruption, and lateral femoral condyle contusion.
    • Subtle subchondral and cancellous bone abnormalities were better visualized on axial STIR images.
    • In 11 cases, patellar dislocation was not suspected prior to MR imaging, highlighting the utility of MR in detecting occult injuries.

    Conclusions:

    • A constellation of findings including hemarthrosis, medial patellar and lateral femoral contusion, and retinacular disruption strongly suggests prior lateral patellar dislocation.
    • Axial STIR MR imaging is highly sensitive for detecting subtle intraosseous signal abnormalities, making it a valuable tool in evaluating the acutely injured knee.