A very low percentage of these presentations are head scratchers. No history and a normal radiograph, but acts like a Nursemaid's that just won't reduce. A nice new tool!
Pediatric Emergency Care 2014 Dec; 30 (12) : 919-21.
Sonographic finding of a pulled elbow: the "hook sign". Youdong Sohn, Yusung Lee, Youngtaek Oh, Wonwoong Lee