Triquetral bone

File:Triangular bone (left hand) - animation01.gif

Triangular bone (left hand) - animation01

File:Triangular bone (left hand) - animation02.gif

Triangular bone (left hand) - animation02

File:Triquetral bone.jpg

Triquetral bone

File:RightHumanPosteriorDistalRadiusUlnaCarpals - Triquetral bone.png

RightHumanPosteriorDistalRadiusUlnaCarpals - Triquetral bone

File:RightHumanAnteriorDistalRadiusUlnaCarpals - Triquetral bone.png

RightHumanAnteriorDistalRadiusUlnaCarpals - Triquetral bone

File:Gray219 - Triangular bone.png

Gray's anatomy image 219 - Triangular bone

Bone of the human wrist

General Information
Latin	Os triquetrum
Greek
TA98
TA2
FMA
Details
System
Artery
Vein
Nerve
Lymphatic drainage
Precursor
Function
Identifiers
Clinical significance
Notes

The triquetral bone, also known as the triquetrum, triangular bone, or cuneiform bone, is one of the eight carpal bones of the wrist. It is situated on the medial side of the proximal row of the carpus, between the lunate bone and the pisiform bone.

Anatomy

The triquetral bone is a three-sided bone that articulates with three other carpal bones: the lunate bone, the pisiform bone, and the hamate bone. It is located in the proximal row of the carpus, which is the row closest to the forearm. The bone has a pyramidal shape and is characterized by its three distinct surfaces.

Surfaces

• The superior surface articulates with the ulna via the triangular fibrocartilage complex (TFCC).
• The inferior surface articulates with the hamate bone.
• The lateral surface articulates with the lunate bone.
• The anterior surface articulates with the pisiform bone.

Function

The triquetral bone plays a crucial role in the complex movements of the wrist. It contributes to the stability and flexibility of the wrist joint, allowing for a wide range of motion. The bone also serves as an attachment point for various ligaments that support the wrist.

Clinical Significance

Injuries to the triquetral bone are relatively uncommon but can occur due to trauma, such as a fall on an outstretched hand. Fractures of the triquetral bone can lead to pain, swelling, and limited motion in the wrist. Diagnosis is typically confirmed through imaging studies such as X-rays or MRI.

Related Pages

• Carpal bones
• Lunate bone
• Pisiform bone
• Hamate bone
• Wrist joint
• Triangular fibrocartilage complex

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