The Triangular Fibrocartilage Complex

The triangular fibrocartilage (TFC) thickness is inversely proportional to the length of the ulna. Positive ulnar variance results in a thinner TFC, which may predispose it to tear [31]. Fenestration of the TFC can be seen, especially in older individuals [32,33]. On oblique coronal images, the TFC is triangular, with its apex attaching to the hyaline cartilage of the radius. The cartilaginous increased signal at the interface should not be misconstrued as a tear [18]. The ulnar insertion of the TFC may also have heterogeneous signal [23]. Striation of the dorsal and volar radioulnar ligaments is not uncommon [11]. Finally, fluid or contrast within the prestyloid recess between the TFC and meniscus homologue should not be misconstrued as a ligament tear (see Fig. 2) [23].

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