This fracture type is classified by the AO/OTA as 13A2.2.
The obliquity of the fracture plane can be in either direction:
This fracture may occur in a young patient with strong bone. Shear forces lead to a simple oblique separation of the metaphyseal/articular block from the shaft.
The radial and ulnar nerves are vulnerable to traction injury or entrapment.
AP x-ray showing a simple extraarticular fracture, obliquely distal and medial