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1Principles

Fracture assessment

Internal fixation of ulnar shaft fractures restores the length of the ulna and congruency of the distal radioulnar joint (DRUJ). Oblique and spiral fractures may be fixed with a lag screw and a protection plate. If the distal ulnar fragment is short, a locking plate, or mini condylar plate may be used.

In transverse ulnar fractures (“defense fractures”) a pre-contoured compression plate is used.

These fractures are not usually associated with DRUJ injuries, but it is good practice to assess the joint after fixation in all cases.