Answer radER 1.1

radER Winners:

Rob Klever                     Chris Guyer

Richard Gordon             David Mishkin

Brian Mcmichael            Marjian Siadat

Julie Nguyen                  Allison Loynd

Answer to Case 1.1

A 55-year-old woman presents to your ED after tripping on the sidewalk curb.  She complains of pain to her lower extremity.  You obtain the following radiograph.

1. What is the diagnosis based from the radiograph?

2. What radiographic view is this?

3. What is the Emergency Department treatment?


1. Dislocation of the patella (Lateral)

2. Sunrise– This is called the sunrise view because the patella appears to be rising over the horizon.

  • used to image a tangential view of the patella
  • the patient is prone with the knee flexed 115 deg
  • taken parallel to the axis of the lower extremity

3. Closed reduction: flex hip, extend at knee, apply superomedial force to the patella

Thank you for everyone who submitted an answer.  Please stay tuned for next week’s radER.

radER is a weekly contest consisting of a radiograph selected from various areas of emergency medicine that are central to the education of medical students and residents in training.

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