The Collaborative International Dictionary
Impacted fracture
Impacted \Im*pact"ed\, a.
Driven together or close.
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Specifically: (Dentistry) Grown in an abnormal direction so that it is wedged against another tooth and cannot erupt normally; -- of teeth, especially the third molar; as, to extract an impacted third molar.
Impacted fracture (Surg.), a fracture in which the fragments are driven into each other so as to be immovable.
WordNet
impacted fracture
n. fracture in which one broken end is wedged into the other broken end