| Ulnar styloid process | |
|---|---|
 Bones of leftforearm seen from front (ulnar styloid process labeled at bottom left) | |
 Diagram of bones in the human arm | |
| Details | |
| Identifiers | |
| Latin | processus styloideus ulnae |
| TA98 | A02.4.06.017 |
| TA2 | 1247 |
| FMA | 23628 |
| Anatomical terms of bone | |
Thestyloid process of the ulna is a bony prominence found atdistal end of theulna in theforearm.[1]
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 thetriangular articular disk, and behind, by a shallow groove for thetendon of theextensor carpi ulnaris muscle.
The styloid process of the ulna varies from 2 to 6mm in length.[1]
The rounded end of the styloid process of the ulna connects to theulnar collateral ligament of thewrist. Theradioulnar ligaments also attaches to the base of the styloid process of the ulna.[2]
Fractures of the styloid process of the ulna rarely require treatment when they occur in association with a distal radius fracture. The major exception is when the joint between these bones, thedistal 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 thetriquetral bone in thewrist, known as ulnar styloid impaction syndrome.[1]Radiology is used to diagnose it.[1]Conservative management involvesinjection oftriamcinolone, whilesurgery involves shortening of the styloid process of the ulna viaresection.[1]
The position of the styloid process of the ulna in relation to the wrist must be considered when applying awrist splint.[3][4] This is important in preventing pressureischaemia.[3]
This article incorporates text in thepublic domain frompage 218 of the 20th edition ofGray's Anatomy(1918)
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