Fall on outstretched hand.
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Extra-articular fracture of distal radius with dorsal angulation and impaction.
Colles fractures are very common extra-articular fractures of the distal radius that occur as the result of a fall onto an outstretched hand. They consist of a fracture of the distal radial metaphyseal region with dorsal angulation and impaction, but without involvement of the articular surface.