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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.
The DRUJ is the part of the wrist joint that lies between the two bones of the forearm (the radius and ulna) and allows forearm rotation. The TFCC also functions as a shock-absorber for the wrist, like a meniscus in the knee. The TFCC may be injured by a fall, sports injury, car crash, or other trauma.