13B1   Partial articular, lateral sagittal fracture

These fractures are classified by the AO/OTA as 13B1.

The fracture may be one of the following types:

• Simple transtrochlear fracture (13B1.1)
• Capitellar fracture (13B1.2), transcapitellar (q), or between capitellum and trochlea (r)

• Fragmentary transtrochlear fracture (13B1.3)

Lateral and frontal fracture types overlap.

The partial articular multifragmentary fractures are often associated with impaction of the posterior part of the lateral column and/or the posterior trochlea.

AP x-ray of an adult elbow showing a partial articular fracture with fragmentation of the fracture zone (fragmentary transtrochlear fracture)

3-D CT reconstruction image of the fragmentary transtrochlear fracture case above