The triangular fibrocartilage complex (TFCC) is a ligamentous and cartilaginous structure that connects the distal radius and carpal bone to the ulna, and has important biomechanical functions for the carpal and distal radial-ulnar joints. Many clinical ulnar symptoms of the wrist that affect patient function are associated with TFCC abnormalities. The distal ulna, radius, and ulnar carpal bone maintain a precise anatomical relationship. Rotation of the distal radial-ulnar joint and movement of the carpal bones are accomplished through the TFCC, which has three important functions: (1) load transfer via the ulnar side of the wrist; (2) stabilization of the distal radial-ulnar joint; and (3) stabilization of the ulnar carpal joint. According to the classical Parmer typing, TFCC injuries are divided into traumatic and degenerative types. 1, traumatic type (type I) A. Horizontal tear of the proximal radius, usually from the dorsal to the palmar side, 2-3 mm from the radial attachment; B. Avulsion from the ulnar attachment, possibly accompanied by ulnar stem fracture; C. Tear of the ulnar carpal ligament, TFCC tears from its attachment to the ulnar carpal bone (such as ulnar lunar and ulnar deltoid ligaments); D. Tear of the radial attachment, this type may have fracture. 2. degenerative type (type II) A. thinning of the articular disc; B. thinning of the articular disc with osteochondral cartilage; C. tear of the articular disc with osteochondral cartilage; D. tear of the articular disc with osteochondral cartilage and partial tear of the lunotriquetral ligament; E. tear of the articular disc with osteochondral cartilage, tear of the lunotriquetral ligament and inflammation of the distal radial-ulnar joint. Clinical symptoms are mainly ulnar wrist pain, wrist weakness, and occasional wrist popping. This is due to the ruptured fibrocartilage flap being squeezed between the ulnar head and the lunar or deltoid bone during forearm rotation. Wrist arthroscopy is currently considered the gold standard for the diagnosis of ulnar wrist pain, and its basic indication is persistent wrist pain and dysfunction after failure of conservative treatment.