Triangular fibrocartilage complex (TFCC) is a well-defined anatomical formation at the ulnar corner of the wrist that primarily stabilizes the distal radioulnar joint and also has a shock absorbing role for the ulnocarpal joint. It also has an important `pulley` function for the extensor carpi ulnaris (ECU) tendon. TFCC is a cartilaginous and ligamentous structure located between the ulnar carpus and the distal ulna. This complex consists of a fibrocartilaginous disc, dorsal and volar radioulnar ligaments, ulnocarpal ligaments, a meniscus-like structure and the deep sheath of the ECU tendon. TFCC traumatic and degenerative tears are the most important causes of ulnar wrist pain. These injuries are initially treated by NSAIDs, steroid injections, splinting and modification of daily activities. Arthroscopic treatment is the gold standard in cases that do not respond to conservative treatment. Arthroscopic surgical treatment depends on the type of injury pattern. It is generally classified as debridement, repair, ulnar shortening and Wafer surgeries. Today, painful ulnar corner (TFCC) injuries can be treated with an outpatient surgery thanks to a better understanding of the wrist arthroscopic anatomy, the development of arthroscopic surgical instruments and equipment and the dexterity of surgeons.