These fractures are classified by the AO/OTA as 13B1.
The fracture may be one of the following types:
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