Point-of-care ultrasound has become a useful clinical adjunct, especially in 
emergency medicine, because it is noninvasive, repeatable, and nonradiating. In 
cases of pulled elbow also known as nursemaid's elbow or radial head 
subluxation, diagnosis is usually performed clinically. However, there is the 
potential for a failed reduction or misdiagnosis. We introduce a potentially 
useful diagnostic finding for pulled elbow ("Hook sign") using point-of-care 
ultrasound in the emergency department.