Anatomy

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