Tears of the Triangular ligament can involve the foveal attachment, the ulnar styloid attachment or  both and can be independent of any tears to the TFC or radial attachment. This is a brief post on the appearance of tears starting with the normal appearance of the triangular ligament.

Image Above: The triangular ligament is the ulnar attachment of the TFC . It has two attachments, one to the ulnar styloid ( red arrow) and the second to the fovea ( ligament yellow arrow, fovea pink arrow). The normal appearance of the ligaments is to be striated.  In between the foveal and styloid attachments is the Ligamentum Subcruentem. Diagram credit see below.

Image Above: Foveal attachment ( blue arrow) and Ulnar styloid attachment ( yellow arrow).

Image Above: Tear of both the foveal and ulnar styloid attachments ( blue arrows). There is loss of normal black signal of the ligaments replaced by ill definition and hyperintensity. Normal radial aspect of the TFC ( red arrow).

Image Above: Tear of both the foveal attachment ( yellow arrows). Normal ulnar styloid attachment ( red arrow). Tear of the radial aspect of the TFC ( blue arrow).

Diagram from Chinese Medical Journal High-resolution 3T Magnetic Resonance Imaging of the Triangular Fibrocartilage Complex in Chinese Wrists: Correlation with Cross-sectional Anatomy 2017 Apr 5;130(7):817-822.. Zhan et al