The TFCC is an important group of structures on the ulnar side of the wrist, including the articular disc, meniscal homologue, palmar and dorsal distal ulnar radial ligaments, deep ulnar extensor tendon sheath, ulnar capsule, ulnar lunar ligament and ulnar deltoid ligament, including the deep and superficial layers, with the stops converging and interlocking to form a joint tendon and ending at the base of the ulnar styloid process. This structure is an important structure of the wrist joint because it is complex and easily damaged, which can easily lead to wrist pain and early degeneration of the joint.TFCC has the following functions: 1.Extension of the ulnar side of the distal radius articular surface, covering the ulnar head.2.Conduct the axial stress between the ulnar wrist joint and absorb part of the load.3.Form a firm elastic connection between the radius and the distal ulna, providing rotational stability.4.To the wrist joint. stability.4.Provide support to the ulnar aspect of the wrist joint. Because of the multiple functions and complex easy to damage, it is clinically more important and should be paid attention to.