|Other names: Triquetrum fracture|
|Triquetral avulsion fracture as seen on lateral X-ray of the wrist|
|Symptoms||Wrist pain and swelling|
|Types||Dorsal cortical, body, palmer cortical|
|Differential diagnosis||Lunate dislocation, pisiform fracture, trapezium fracture, hamate fracture|
Triquetral fracture is a break of the triquetral bone of the wrist. Symptoms include pain in the wrist. This is often worsened by bending the wrist forwards or backwards and swelling over the back of the wrist maybe present. Associated injuries may include a perilunate dislocation. Complications can include stiffness or instability of the wrist.
It most commonly occurs as a result of a fall onto the hand or being pulled appart by an attached ligament. Other causes may include a direct blow. Diagnosis is generally based on wrist X-rays, though CT scaning can also be useful. Types include dorsal cortical (most common), body, and palmer cortical.
Treatment is generally by casting for 4 to 6 weeks. If the peices are seperated, surgery maybe indicated. Outcomes are generally good with dorsal cortical fractures, while in palmer cortical fractures it may be mixed.
Triquetral fractures represent about 15% of breaks of bones within the wrist, making it the second or third most common after scaphoid and lunate fractures. They were first described at least as early as 1933 by Thompson.
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