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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.
Sometimes, the TFCC can get worn through over time and tear without any injury if the ulna bone (the forearm bone on the small finger side) is longer than the radius (the forearm bone on the thumb side). This relatively long ulna puts a lot of pressure on the TFCC during forceful wrist use.