Lateral patellar dislocation of the left knee. Note that the knee is held in approximately 20 degrees of flexion and the patella (arrow) is laterally displaced.
Reproduced with permission from: Silverberg M. Patellar dislocations. In: Greenberg's Text-Atlas of Emergency Medicine, Greenberg MI (Ed), Lippincott Williams & Wilkins, Philadelphia 2005. Copyright © 2003 Lippincott Williams & Wilkins.
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