Diagnosis

Anterior transolecranon fracture dislocation

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The radial head is intact. The relationship of the radius to the ulna is not disrupted - the entire forearm is dislocated or subluxate anteriorly. The articular surfaces of the coronoid and olecranon remain opposed to the articular surface of the trochlea.  The medial and lateral collateral ligaments are usually intact.  If the coronoid is fractured, it is usually a single large fragment.