TFCC injury (Palmer 1b)
Falling on outstretched hand 1 week ago followed by pain and limited movement
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Distal radioulnar joint instability associated with distal ulnar marrow edema and tear of the ulnar attachment of TFCC allow some fluid to track proximal to the ligament.
Diagnosis: TFCC tear type 1b and DRUJ instability
Intact TFCC prevents fluid to cross the ligament proximally to the forearm. Other abnormalities may be associated e.g. DRUJ instability, carpal instability and ulnar impaction syndrome.