Complex elbow fracture-dislocations have the potential to be associated with significant long-term morbidity 1.
Pathology
Types
- terrible triad
- trans-olecranon fracture-dislocation
- anteromedial coronoid fractures with associated varus posteromedial instability
Mechanism
The mechanism is dependent on the type of fracture-dislocation 1. It is postulated the terrible triad usually occurs as a result of a fall on an outstretched arm. This causes a valgus posterolateral force with resulting injury to the capsuloligamentous structures sequentially from lateral to medial 1.
Trans-olecranon fracture-dislocations generally occur due to axial loading with associated ulnohumeral joint disruption and displacement of the radial head anterior to the capitellum1.
Anteromedial coronoid fractures generally occur as a result of a varus posteromedial rotational injury 1.