You’re in a supermarket, and your child darts from you, or it’s time to go and your child throws a tantrum. You grab your runaway by the wrist. He yanks one way, you pull the other, and the elbow, which was not made for this tug-of- war, pops out of the socket. Result: Your child won’t use his arm as it hangs limply at his side. This is a pulled elbow, which your doctor or emergency room physician can easily pop back into place without any lasting harm. During swinging play or if you must grab your child by the lower arm, holding both arms is unlikely to strain the elbow.