The type of fracture that typically affects youth and occurs when bones have not fully ossified is called?

A greenstick fracture is a type of fracture that is most commonly seen in children, who have bones that are not fully ossified. This type of fracture occurs when one side of the bone bends or cracks, while the other side remains intact, resembling a green twig that has been partially broken. The reason this type of fracture is prevalent among youth is due to their bones being more pliable and less brittle than adult bones. In children, this flexibility can lead to fractures that do not completely break through the bone, which is what distinguishes greenstick fractures from others like complete fractures.

Other types of fractures, such as spiral, depressed, and oblique fractures, usually result from specific mechanisms or locations of injury and do not primarily pertain to the characteristic flexibility of children's bones. Thus, the unique nature of a greenstick fracture aligns perfectly with the condition of youth bones, making it the correct choice in this context.