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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 TFCC, or the Triangular Fibro-Cartilaginous Complex, is made up of a cartilage disc that sits over the end of the ulna (the bone in the arm). This provides a smooth surface between the radius and ulna, and a group of ligaments that hold the radius and ulna together, or the Distal Radio-Ulna Joint (DRUJ).