Normal alignment of distal humerus and capitellum
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Normal alignment of the distal humerus and capitellum
A line drawn along the anterior broder of the distal humerus (green) should intersect the long axis of the capitellum (purple) in the mid third (area shaded light green).
In the setting of a painful elbow following a fall, if this line does not intersect the green area, but rather the red area then a supracondylar fracture should be suspected.