Acute lateral patellar dislocation
Anterior knee pain and click following twisting trauma 2 weeks ago
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There is torn medial patellofemoral ligament MPFL from its patellar attachment with focal depression of the patella at this site (? avulsion) and characteristic focal marrow edema pattern involving the medial patella and lateral femoral condyle.
- Elias DA, White LM, Fithian DC. Acute lateral patellar dislocation at MR imaging: injury patterns of medial patellar soft-tissue restraints and osteochondral injuries of the inferomedial patella. Radiology. 2002;225 (3): 736-43. Radiology (full text) - doi:10.1148/radiol.2253011578 - Pubmed citation