Distal Ulna Exam
When examining the distal ulna look for deformity, swelling, loss of ulnocarpal and radioulnar joint motion.
Palpate for tenderness and crepitus in joint and bone.
X-ray evaluation is typically needed.
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Diagram of distal radius and ulna -
X-ray of distal radius and ulna -
CT of distal radius and ulna
When evaluating fractures of the distal ulna look for step-offs and/or gaps in the articular surface of the distal radius.
When evaluating trauma to the distal ulna look for signs of subluxation and/or dislocation of the distal ulna..
When evaluating ulnar styloid base fractures be aware that the TFCC may no longer be attached to the remaining ulnar head and ulnar shaft.
Distal ulna fracture evaluation may also require CT scans to properly visualize fragments, angulations, degree of fragment displacement and subluxation.
Ulnar positive variance may cause ulnolunate impaction syndrome and cysts in the ulnar subchondral lunate bone.