Distal radioulnar joint and triangular fibrocartilage complex (TFCC) injury
Diagnosis almost certain
Presentation
Fall during a bicycle accident 3 weeks earlier. Positive piano key sign.
Patient Data
Age: 20 years
Gender: Male
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Bone bruise and dorsal displacement of the ulnar head of about 10 mm. Effusion in the distal radioulnar joint. Focal bleeding into the ulnar insertion of the discus with avulsion of the ulnar styloid process.
Case Discussion
Marked dorsal displacement of the ulnar head, volar capsular haematoma and effusion of the distal radioulnar joint indicates rupture of the volar radioulnar ligament and distal radioulnar joint instability.