Coronoid fracture

Rarely occurs alone, but usually in combination with a radial head fracture, elbow dislocation or both.

Large fractures may be associated with instability of the elbow, even after repair.

Occurs in only 1-2% of elbow fractures and in 10-15% of elbow dislocations.

Large fractures have more complications and instability than do less significant injuries.

Fractures probably a result of shear forces when the trochlea pushes off the coronoid.

The coronoid acts as the anterior buttress of the greater sigmoid notch of the ulna.

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