Fall on an outstretched hand.
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Extra-articular transverse fracture through distal radius with dorsal angulation. Note the transverse fracture through the ulnar styloid process.
Colles fracture is the most common type of distal radial fracture seen in adults. These fractures are particularly common in osteoporotic patients. It is uncommon in young patients but when a Colles fracture does occur in young people it is usually due to high energy trauma or fall (eg. sports).
Most Colles fractures are due to fall on an outstretched hand (FOOSH) with the forearm pronated and the wrist in dorsiflexion.