The ulnar collateral ligament, the triangular fibrocartilage disc, the palmar and dorsal radial ulnar ligaments, the meniscal approximation, and the tendon sheath of the ulnar extensor carpi radialis tendon are composed of the ulnar collateral ligament, and the triangular fibrocartilage disc is only the weakest and most vulnerable part of the injury. The injury is easily diagnosed: 1, history of wrist sprain or bruise 2, pain on the ulnar side of the wrist after injury 3, examination of the distal ulnar region pressure pain, axial pressure on the wrist ulnar deviation can induce pain. Diagnosis of TFCC injury should be routinely taken wrist X-ray to exclude fracture, and MRI examination is advisable if available. However, MRI imaging of the wrist has higher sensitivity, and wrist arthroscopy is the gold standard for the diagnosis of TFCC injury. Moreover, treatment can be performed while confirming the injury. Because the TFCC is a complex of multiple tough tissues in the anatomical and biological sense of the wrist, it has the role of bearing, transmitting and cushioning pressure, and is one of the main structures that maintain ulnar stability of the wrist joint. Therefore, the treatment of TFCC injury is aimed at restoring the function of the wrist joint and preventing the occurrence of ulnar side wrist pain. Most of the acute TFCC injuries can be relieved by early diagnosis and proper conservative treatment to restore the wrist movement function. For patients who have been diagnosed and conservative treatment is ineffective, surgery is the only treatment method, but conventional open surgery has greater limitations. Wrist arthroscopy is currently the best method for diagnosing and treating TFCC injuries. The TFCC central tear is cleaned up arthroscopically to remove the free tear flap and prevent the tear flap from being embedded and causing joint interlocking; TFCC radial attachment margin lacerations are generally small and do not change during forearm rotation and can be treated without treatment; TFCC ulnar margin injuries are less common and can be repaired with sutures if a TFCC suture device is available. Due to the important role of the TFCC in stabilizing the wrist joint, its structure should be preserved as much as possible, and major resection should not be done easily. Although the wrist arthroscopic treatment of TFCC injury is less invasive and more effective, wrist arthroscopic surgery requires high equipment and technical skills, as well as skilled surgeons and extensive clinical experience to obtain satisfaction.