type i fractures ( 27 fractures ) involved the distal articular surface of the accessory carpal bone , type ii ( 6 fractures ) were of the proximal articular margin , type iii ( 1 fracture ) were at the origin of the accessorometacarpal ligaments , type iv ( 6 fractures ) were avulsion fractures at the tendon of insertion of the flexor carpi ulnaris muscle , and type v ( 3 fractures ) were comminuted fractures .
C0016658
fractures
C0332758
avulsion fractures