Triquetral

Triquetral bone (also known as the triquetrum bone, pyramidal bone, cuneiform bone, and triangular bone) is one of the eight small carpal bones in the wrist. It is located in the row closest to the forearm and is positioned next to the pisiform bone which sits in front of the triquetral.

Structure

The triquetral bone is the third most commonly fractured carpal bone. It can be distinguished by its pyramidal shape and its location on the ulnar side of the wrist. It has three surfaces: the superior, inferior, and dorsal surfaces. The superior surface is round and smooth for articulation with the lunate bone. The inferior surface, directed lateralward, is concave, sinuously curved, and smooth for articulation with the hamate bone. The dorsal surface is rough for ligamentous attachment.

Clinical significance

Fractures of the triquetral bone are usually caused by a fall on an outstretched hand. They can also occur as a result of direct trauma to the wrist. Symptoms of a triquetral fracture include pain and swelling in the wrist, difficulty moving the wrist, and a possible deformity of the wrist. Treatment for a triquetral fracture may include immobilization, physical therapy, or surgery.

See also

• Carpal bones
• Wrist fracture

References

Triquetral Resources
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