This condition is a degenerative or traumatic tear of one or more parts of the triangular fibrocartilage complex (TFCC), which stabilizes the ulna. The TFCC is composed of a group of ligaments that form connections between the radius, ulna and the carpal bones of the hand. At the center of these ligaments lies the most commonly injured structure, the triangular fibrocartilage disc, which is connected between the radius and the base of the ulnar styloid.

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