TFCC Injuries: Understanding the Triangular Fibrocartilage Complex

What Is the TFCC?

The triangular fibrocartilage complex (TFCC) is a multifunctional structure on the ulnar (little finger) side of the wrist, interposed between the distal ulna and the proximal carpal bones. Its name reflects both its shape and composition: a triangular fibrocartilage disc (the articular disc), surrounded by supporting ligamentous components — the dorsal and palmar radioulnar ligaments, the ulnocarpal ligaments (ulnolunate and ulnotriquetral), the meniscus homologue, and the extensor carpi ulnaris tendon sheath. Together, these structures perform three essential functions: cushioning compressive loads across the ulnar wrist; stabilising the distal radioulnar joint (DRUJ) during forearm rotation; and transmitting approximately 20% of the load from the hand to the forearm (increasing to 40% in ulnar-positive variance — where the ulna is relatively longer than the radius).

Types of TFCC Injury

Palmer's classification divides TFCC injuries into traumatic (Class 1) and degenerative (Class 2) types. Traumatic injuries are subdivided by location: class 1A (central perforation — the most common traumatic tear), 1B (avulsion from the ulnar styloid), 1C (disruption of the ulnocarpal ligaments), and 1D (avulsion from the radial attachment). Traumatic TFCC tears typically result from a fall on an outstretched hand with the forearm in a loaded rotation position, a direct blow to the wrist, or a distraction injury during gripping (common in racquet and throwing sports). Degenerative class 2 injuries reflect age-related fibrocartilage degeneration, are rarely symptomatic, and are present in the majority of adults over 50.

Presentation and Diagnosis

The dominant symptom is ulnar-sided wrist pain — pain on the little-finger side of the wrist, typically aggravated by forearm rotation under load (turning a door handle, jar opening, wringing a cloth), ulnar deviation, and grip. The press test (pushing up from a chair on both hands, loading the ulnar wrist) and the TFCC stress test (compressing the ulnar wrist while rotating the forearm) reproduce symptoms in positive cases. DRUJ instability — a clunk or excessive dorsopalmar translation of the distal ulna relative to the radius — indicates peripheral TFCC disruption involving the radioulnar ligaments. MRI arthrography (injecting contrast fluid into the radiocarpal joint before MRI) is the imaging gold standard, detecting central perforations and peripheral tears with higher sensitivity than standard MRI.

Management

Central (class 1A) TFCC tears lack vascular supply and have limited healing capacity. However, many remain asymptomatic with appropriate management. Immobilisation in a forearm splint or cast for four to six weeks reduces mechanical stress and allows peripheral tears (which have vascular supply from the subsynovial plexus) to heal. Manual therapy addressing distal radioulnar joint mobility and wrist proprioception, combined with progressive grip and forearm rotation loading, restores function. Corticosteroid injection into the DRUJ or radiocarpal joint provides pain relief in degenerative presentations. Arthroscopic management — debridement of irreparable central tears or surgical repair of peripheral tears — produces excellent outcomes when conservative management fails, and is the preferred approach for peripheral class 1B or 1D tears in active patients.