Acute annular ligament interposition into the radiocapitellar joint 
("nursemaid's elbow") is a common injury in children younger than 5 years. The 
injury occurs when axial traction is applied to an extended, pronated arm. There 
are no abnormal radiographic findings associated with this condition. We 
recommend that children with a classic history and clinical presentation of an 
acute annular ligament interposition into the radiocapitellar joint be treated 
without obtaining radiographs.