Radioulnar dislocation Distal radioulnar joint translation 2025-10-30T12:28:45Z Abnormal linear movement or displacement of the ulnar head relative to the radius at the wrist, indicating instability of the distal radioulnar joint, which is the distal articulation between the radius and ulna, acting as a major weight-bearing joint at the wrist and distributing forces across the forearm bones. CT scan shows subluxation of the distal ulna either volar, dorsal, or lateral such that it is no longer congruent in the sigmoid notch.