greenstick fracture

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A partial bone fracture, usually seen in young people, in which one side of the bone is broken and the other side is bent.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An incomplete fracture of a long bone in which one side of a bone is broken while the other is bent

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a partial fracture of a bone (usually in children); the bone is bent but broken on only one side