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A TFCC tear is an injury to the triangular fibrocartilage complex, found in the wrist, between the end of the ulna bone and the carpals. Its function is to stabilize the radioulnar joint.
1 The TFCC (Triangular Fibrocartilage Complex) is composed of a disc (similar to the meniscus in the knee) and several adjacent ligaments on the ulnar side of the wrist. 2  It supports the ulna and maintains joint space in the wrist during weight bearing (both hanging and support activities).