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Ulnar styloid process

Ulnar styloid process
Bones of left forearm seen from front (ulnar styloid process labeled at bottom left)
Human arm bones diagram.svg
Diagram of bones in the human arm
LatinProcessus styloideus ulnae
Anatomical terms of bone

The styloid process of the ulna is a bony prominence found at distal end of the ulna in the forearm.


The styloid process of the ulna projects from the medial and back part of the ulna. It descends a little lower than the head. The head is separated from the styloid process by a depression for the attachment of the apex of the triangular articular disk, and behind, by a shallow groove for the tendon of the extensor carpi ulnaris muscle.

The styloid process of the ulnar varies in length between 2 mm and 6 mm.


The rounded end of the styloid process of the ulna connects to the ulnar collateral ligament of the wrist. The radioulnar ligaments also attaches to the base of the styloid process of the ulna.

Clinical significance

Fractures of the styloid process of the ulna seldom require treatment when they occur in association with a distal radius fracture. The major exception is when the joint between these bones, the distal radioulnar joint (or DRUJ), is unstable. When the DRUJ is unstable, the ulnar styloid may require independent treatment.

An excessively long styloid process of the ulna can cause painful contact with the triquetral bone in the wrist, known as ulnar styloid impaction syndrome. Radiology is used to diagnose it. Conservative management involves injection of triamcinolone, while surgery involves shortening of the styloid process of the ulna via resection.

The position of the styloid process of the ulna in relation to the wrist must be considered when applying a wrist splint. This is important in preventing pressure ischaemia.

This page was last updated at 2023-01-15 13:09 UTC. Update now. View original page.

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