Triquetrum Bone

Home Arm Bones Triquetrum Bone

Published on June 21st 2018 by

What is the Triquetrum Bone

Triquetrum or the triquetral bone (Latin: os triquetrum) is a three-sided or pyramid-shaped carpal or wrist bone [1, 2]. Its name is derived from the Latin word ‘triquetrus’, or ‘having three corners’ [3] – referring to the fact that it has three prominent articular surfaces [4].

Where is the Triquetrum Bone Located

It is one of the four proximal carpal bones, being the third bone, after the scaphoid and lunate, from the thumb [4]. It is situated between the pisiform and lunate bones [3].

Triquetrum Bone

Development and Ossification

The triquetrum is the third bone to develop, ossifying during the second or third year of life [5, 6] (meaning it will be visible in an x-ray in a 2-3 year old child). The order may be different in girls [7].

Triquetral Bone X-Ray

Structure and Anatomy

Surfaces and Articulations

It articulates with three of the carpal bones and thus has three major articular surfaces – the smallest one being an oval facet on the palmar surface, for the pisiform bone [8]. The distal concave surface is meant for the hamate and is the largest of the articular facets [8]. The third surface articulating with the lunate is continuous with, but lateral to, the hamate facet [4].

Triquetrum Bone Articular Surface Anatomy

The rough dorsal surface of the bone serves for all the ligament attachments [9].

Blood Supply

The triquetrum receives its primary blood supply from the ulnar artery [10]. It is supplied on its two non-articular surfaces, by a network of nutrient vessels [3].

Functions: What does the Triquetrum Bone Do

Its primary function is to shape up and maintain the flexibility of human wrists along with the other carpal bones.

Associated Conditions and Common Injuries

The triquetrum is the third most commonly fractured carpal bone, often occurring due to overextension of the wrist, like during a fall, or when playing sports [11].

Leave a Reply

Your email address will not be published. Required fields are marked *