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Related Experiment Videos

Transient lateral patellar dislocation: diagnosis with MR imaging

M D Kirsch1, S W Fitzgerald, H Friedman

  • 1Department of Radiology, Northwestern Memorial Hospital, Chicago, IL 60611.

AJR. American Journal of Roentgenology
|July 1, 1993
PubMed
Summary

Magnetic resonance (MR) imaging reveals a distinct pattern of findings that aids in diagnosing transient lateral patellar dislocation, often missed clinically. This MR imaging approach helps differentiate it from other knee injuries.

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Area of Science:

  • Orthopedic imaging
  • Musculoskeletal radiology

Background:

  • Transient lateral patellar dislocation is challenging to diagnose clinically.
  • Accurate diagnosis is crucial for appropriate patient management.

Purpose of the Study:

  • To evaluate the utility of magnetic resonance (MR) imaging in diagnosing transient lateral patellar dislocation.
  • To identify characteristic MR findings associated with this injury.

Main Methods:

  • Retrospective review of 1450 knee MR examinations.
  • Identification of a specific constellation of MR findings in 26 patients with transient lateral patellar dislocation.
  • Correlation of MR findings with clinical and surgical outcomes.

Main Results:

  • A distinctive pattern of MR findings was identified in 26 patients.

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  • Key findings included medial retinaculum disruption (96%), lateral patellar tilt/subluxation (92%), lateral femoral condyle contusion (81%), and osteochondral injury (58%).
  • Joint effusion was present in all cases (100%).

    • Conclusions:

    • MR imaging demonstrates a characteristic set of findings for transient lateral patellar dislocation.
    • These MR findings can help distinguish this condition from other common knee injuries, improving diagnostic accuracy.