22u-D/5   Ulna, complete oblique or spiral

Complete oblique (>30°) or spiral fractures, simple and multifragmentary (22u-D/5.1 and 5.2), are inherently unstable.

Note: In all cases of an isolated ulnar fracture, it is important to confirm the normal alignment of the radiocapitellar joint and specifically exclude a Monteggia lesion.