Triangular fibrocartilage
The Triangular fibrocartilage complex (TFCC) is formed by the triangular fibrocartilage discus (TFC), the radioulnar ligaments (RUL’s) and the ulnocarpal ligaments (UCL’s).
Structure
Triangular fibrocartilage disc
The TFC is an articular discus that lies on the pole of the distal ulna. It has a triangular shape and a biconcave body; the periphery is thicker than its center. The central portion of the TFC is thin and consists of chondroid fibrocartilage; this type of tissue is often seen in structures that can bear compressive loads. This central area is often so thin that it is translucent and in some cases it is even absent. The peripheral portion of the TFC is well vascularised, while the central portion has no blood supply.
This discus is attached by thick tissue to the base of the ulnar styloid and by thinner tissue to the edge of the radius just proximal to the radiocarpal articular surface.
Radioulnar ligaments
The RUL’s are the principal stabilizers of the distal radioulnar joint (DRUJ). There are two RUL's, the palmar and dorsal radioulnar ligaments.