avulsion (from carpus)
:Class 1D. Radial avulsion (with or without sigmoid notch fracture)

;Class 2 - Degenerative (ulnar impaction syndrome)
:Class 2A. TFCC wear
:Class 2B. TFCC wear with lunate and/or ulnar head chondromalacia
:Class 2C. TFCC perforation with lunate and/or ulnar head chondromalacia
:Class 2D. TFCC perforation with lunate and/or ulnar head chondromalacia, and with lunotriquetral ligament perforation
:Class 2E. TFCC perforation with lunate and/or ulnar head chondromalacia, with lunotriquetral