Nursemaid's elbow sounds almost benign, hardly alarming at all. But you only have to hear a baby or toddler screaming in pain once to know the condition is in no way harmless.

Kim Chapman from Katy, Texas, remembers that sound all too well. Her 22-month-old son, Cody, was playing around on the bed when Chapman asked her 10-year-old daughter to get him down. Her daughter pulled her son one way by the arms as Cody pulled in the opposite direction.

"He started crying and pointing to his arm," Chapman says. "I couldn't get him to stop crying, which is unusual for Cody. He finally fell asleep in my arms, but he would still cry out about every five minutes. I just knew he had broken or sprained his arm."

Her husband wanted to wait until the morning to take him to see his pediatrician, but Chapman had a gut feeling that something was very wrong. She was right.

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