A triquetral fracture happens when you break or crack the triquetrum, one of the 8 small carpal bones that form a part of your wrist.
It is a pyramidal shaped bone that can be found in the medial side of the wrist. The name triquetrum is derived from the Latin word triquetrus which means "three-cornered". Sometimes it is also called triquetral bone, triangular bone or cuneiform bone.
Of the eight small bones (carpals) in your wrist, the triquetrum is one of the most commonly injured. It's a three-sided bone in your outer wrist. All of your carpal bones, including the triquetrum, lie in two rows between your forearm and hand.
A Triquetral fracture is a break of the Triquetral bone (sometimes called triquetrum). It is one of the eight small carpal bones in the wrist and the second most commonly fractured carpal. A sudden, direct impact is the most common cause, resulting in wrist pain on the little finger side.
Medical Definition of triquetral bone : the bone in the proximal row of the carpus that is third counting from the thumb side of the wrist, has a pyramidal shape, and is situated between the lunate and pisiform bones. — called also triangular, triangular bone, triangularis, triquetral, triquetrum.
The triquetrum is the second most commonly fractured carpal bone after the scaphoid. Nondisplaced triquetral fractures usually heal well, without complication. 2. The triquetrum bone articulates with the lunate and resides deep to the pisiform.
Its primary function is to shape up and maintain the flexibility of human wrists along with the other carpal bones.
The triquetrum articulates with three bones: lunate, pisiform, and hamate. The lateral surface of the triquetrum is flat and articulates with the lunate, to which it is attached by the lunotriquetral ligament. The distal end faces laterally forming the sinuous, concave facet that articulates with the hamate bone.
Wrist — The wrist is a joint complex where the radius, scaphoid, lunate, and triquetrum bones articulate. It can also be called the radiocarpal joint(s). It is a biaxial joint capable of moving in two anatomical axes, the sagittal and frontal.
pronator teres muscle.flexor carpi radialis muscle.palmaris longus muscle. palmar aponeurosis.flexor carpi ulnaris muscle.
Triquetral fractures are carpal bone fractures generally occurring on the dorsal surface of the triquetrum. The triquetral may be fractured by means of impingement from the ulnar styloid, shear forces, or avulsion from strong ligamentous attachments.
The triquetrum can best be palpated by placing the wrist in radial deviation, finding the ulnar styloid, and palpating just distal to that. The first bony prominence encountered is the triquetrum (circled area).