Ulnar styloid process

The styloid process of the ulna is found at distal end of the forearm, and projects from the medial and back part of the bone; it descends a little lower than the head, and its rounded end affords attachment to the ulnar collateral ligament of the wrist.

Ulnar styloid process
Bones of left forearm seen from front (ulnar styloid process labeled at bottom left)
Diagram of bones in the human arm
Details
Identifiers
Latin	Processus styloideus ulnae
TA	A02.4.06.017
FMA	23628
Anatomical terms of bone

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.

Ulnar styloid fractures 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.