PMC9968545_01
Index case with a flipped fragment (encircled) in the distal radioulnar joint (DRUJ). (
A
) Coronal proton density fat saturated (PDFS) image demonstrating intact styloid (arrow) and foveal (solid arrow) attachments of triangular fibrocartilage complex with the meniscal homolog (asterisk). The solid horizontal lines depict the mild positive ulnar variance. (
B
) Flipped fragment in the DRUJ (encircled) with intact ulnar collateral ligament (arrow). (
C
) Sagittal PDFS image demonstrating the flipped component into the volar aspect of DRUJ (encircled) with attenuated dorsal radioulnar ligament (arrow). (
D
) Axial PDFS image demonstrating the flipped fragment (encircled) on the volar aspect of the DRUJ.
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PMC9968545_01_10-1055-s-0042-1759484-i2271769-1.jpg
FI2271769-1
TFCC, and the ulnomeniscal homolog were intact. The ulnotriquetral and ulnolunate ligaments were also intact. The patient was noted to have mild positive ulnar variance ( Fig. 1 ). 