The mechanism is likely to be a fall onto an outstretched hand.
Note: Be aware of nonaccidental injury in infants where the mechanism is likely to be a traction injury.
These injuries are associated with local tenderness over the distal forearm, specifically over the radius and ulna. Local swelling is usual.
Careful scrutiny of the x-rays is important to identify the presence, or absence, of a metaphyseal component, as this may be the only radiologically visible sign of a corner/bucket handle fracture, which can be an indicator of nonaccidental injury.