The radial collateral ligament of the wrist connects the radial styloid to the scaphoid, providing stability against excessive ulnar deviation and supporting the radial wrist column. It is rarely torn in isolation but is involved in complete wrist dislocations and severe radial styloid fractures. De Quervain tenosynovitis in the first extensor compartment overlies this ligament, and the two conditions can be confused clinically.
| Origin | Radial styloid process |
|---|---|
| Insertion | Scaphoid waist and trapezium |
| Actions | Limits ulnar deviation and provides radial-sided wrist stability |
|---|
The radial collateral ligament is assessed by applying ulnar deviation stress to the wrist — pain and instability at the radial styloid level distinguishes ligament injury from de Quervain tenosynovitis which is reproduced by resisted thumb extension rather than wrist stress. Radial styloid fractures that extend to involve the radial collateral ligament attachment may require internal fixation to restore both bony and ligamentous stability.
Radial wrist ligament injury from forceful ulnar deviation producing radial styloid pain managed with immobilisation.
