Os triquetrum

Os Triquetrum or Triquetral bone is one of the carpal bones located in the human wrist. It is a part of the proximal row of carpal bones, one of the seven bones that form the human wrist. The os triquetrum is located on the ulnar side of the wrist, and it articulates with the pisiform bone, lunate bone, and hamate bone.

Anatomy

The os triquetrum is pyramid-shaped and has three surfaces: proximal, distal, and dorsal. The proximal surface is round and smooth for articulation with the lunate bone. The distal surface is oval, articulating with the hamate bone, and the dorsal surface is rough for ligamentous attachment.

Function

The os triquetrum, along with the other carpal bones, contributes to the flexibility and movement of the wrist. It allows for the complex movements of flexion, extension, abduction, and adduction.

Clinical Significance

Injuries to the os triquetrum are relatively rare but can occur due to a fall onto an outstretched hand or from direct trauma. The most common injury is a triquetral fracture, which can be diagnosed through X-ray imaging. Treatment typically involves immobilization with a cast or splint, but surgery may be required in severe cases.

See Also

• Carpal bones
• Wrist
• Pisiform bone
• Lunate bone
• Hamate bone