Drop sign

Last revised by Joachim Feger on 14 Nov 2021

The drop sign is referred to as an increased ulnohumeral distance (≥4 mm) on a lateral radiograph of the elbow after reduction of elbow dislocation and indicates instability 1-4.

History and etymology

The drop sign was first described in 2005 by Ralph W Coonrad (fl. 2020), an orthopedic surgeon at Duke University in North Carolina, USA 1.

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