Scholastic ScienceWorld—May 12, 2008
Ligaments attach one bone to another and are made of collagen, which stretches easily but within a limit. "They are meant to be flexible but not too flexible," said Dr. Rebecca Demorest, a sports medicine specialist at Hospital for Special Surgery in New York. "That way your joints don't move out of place completely."
The article appears in the May 12 issue of Scholastic ScienceWorld.