Anatomy
1. TFCC
- central articular disc
- TFCC is major stabiliser of DRUJ
- arises ulnar aspect of lunate fossa of radius
- inserts fovea at base of ulna styloid
2. Dorsal and Palmar Radio-Ulna ligaments
Thick fibrous structures
- from ulna styloid
- important stabilises of DRUJ
In normal wrist
- Dorsal RU ligament tight in pronation
- Palmar RU ligament tight in supination
Unstable wrist is opposite
- in pronation wants to dislocate dorsally
- PRUL which tightens
- in supination wants to dislocate volar
- DRUL tightens
3. ECU Sheath
4. Ulna Collateral ligament
- arises base of ECU sheath
5. Ulnotriquetral / Ulnolunate ligaments
- ulno-carpal ligaments
- play important role
- not part of TFCC
Conditions
TFCC tears
DRUJ instability (acute or chronic)
DRUJ arthritis