Transient patellar dislocation

Case contributed by Dr Sherif Shebl Kotkata

Presentation

Twisting injury of the knee, with severe pain, and limitation of movement after trauma.

Patient Data

Age: 20Y
Gender: Male
MRI
  • The patella shows moderate bone marrow oedema along its medial articular surface, that also shows mild angulation of its bone cortex, suggesting mild compression fracture with altered signal of the corresponding overlying retropatellar cartilage.  
  • Bone marrow oedema is noted along the lateral aspect of the lateral femoral condyle, and minimally along the anteromedial aspect of the medial tibial plateau. 
  • The patellar attachment of the medial retinaculum shows increased girth with abnormal signal intensity, impressive of sprained or partially torn medial retinaculum.
  • Moderate knee joint effusion.
  • This distribution pattern of bone marrow oedema added to the soft tissue injury, overall features are impressive of transient patellar dislocation injury.
MRI
  • The patella shows moderate bone marrow oedema along its medial articular surface.
  • Bone marrow oedema is noted along the lateral aspect of the lateral femoral condyle, and minimally along the anteromedial aspect of the medial tibial plateau. 
  • Moderate knee joint effusion.
MRI
  • The patella shows moderate bone marrow oedema along its medial articular surface.
  • Bone marrow oedema is noted along the lateral aspect of the lateral femoral condyle, and minimally along the anteromedial aspect of the medial tibial plateau. 
  • Moderate knee joint effusion.

Case Discussion

  • Bone marrow oedema in almost contralateral articular bone surfaces of the patella and femur (medial and lateral articular surfaces) are alarming signs of transient patellar dislocation injury pattern.
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Case information

rID: 51154
Case created: 5th Feb 2017
Last edited: 5th Feb 2017
Inclusion in quiz mode: Included
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