A 3-year-old male toddler complains of sudden arm pain. The mother indicated that pain occurred suddenly while his 9-year-old sister was helping him get dressed. The child presents with the arm flexed while protecting his elbow. On physical examination, there is tenderness along the radius with no swelling or evidence of trauma. This is a typical history of:

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Nursemaid's elbow, also known as radial head subluxation, commonly occurs in young children when a sudden pull on the extended pronated arm leads to subluxation of the radial head from under the annular ligament. The typical presentation includes a child refusing to use the arm, holding it in a flexed and pronated position, often after an event involving pulling on the arm.

A 3-Year-Old Male Toddler Complains of Sudden Arm Pain