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History

An 9-year-old male presents with a history of "injury".  

Findings

Two radiographs of the right elbow demonstrate posterior displacement of the ulna and radius relative to the distal humerus.

Follow-up 

Post-reduction images demonstrate normal alignment of the elbow jointIntereting Case 2018 06 07 p2.png

Diagnosis

Elbow diclocation

Answers
  1. What is the probable mechanism of injury?
    1. Normal exam; no injury identified.
    2. Anterior force on a flexed elbow.
    3. Fall on an outstretched hand.
    4. Traction applied to an extended arm.
  2. What is the most commonly associated fracture associated with this injury?
    1. Normal exam: no associated injuries.
    2. Avulsion fracture of the medial epicondyle.
    3. Mid shaft fracture of the radius (not shown on this exam).
    4. Radial nerve injury

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