Table 1.

Ultrasound classification for triangular fibrocartilage complex lesions.

Class 1 (Traumatic)
(A). Central tear of the articular disc
(B). Ulnar attachment tear of the articular disc
(C). Radial attachment tear of the articular disc
(D). Horizontal tear of the articular disc
(E). Injury of the triangular fibrocartilage component other than the articular disc, i.e., meniscus homologue; radioulnar, lunotriquetral, and ulnar collateral ligaments; or extensor carpi ulnaris tendon subsheath
Class 2 (Degenerative)
(A). Articular disc wear
(B). Class 2A plus chondromalacia of the lunate or the ulna
(C). Class 2B plus articular disc rupture
(D). Class 2C plus lunotriquetral ligament rupture and cartilage abnormalities
(E). Class 2D plus ulnocarpal/radioulnar arthritis