'Impacted fracture' definitions:

Definition of 'impacted fracture'

noun

Fracture in which one broken end is wedged into the other broken end

From: GCIDE

Impacted \Im*pact"ed\, a.
1. Driven together or close. [1913 Webster]
2. 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. [PJC]
Impacted fracture (Surg.), a fracture in which the fragments are driven into each other so as to be immovable. [1913 Webster]