Wrist

 

Extensor

Carpi

Radialis

Longus

Extensor

Pollicis

Abductor

Pollicis

Longus

Extensor

Digiti

Minimi

Extensor

Digitorum

Extensor

Carpi

Radialis

Brevis

Extensor

Carpi

Ulnaris

Palmer classification for triangular fibrocartilage complex abnormalities

Class 1: Traumatic

•A - central perforation

•B - ulnar avulsion with or without distal ulnar fracture

•C - distal avulsion

•D - radial avulsion with or without sigmoid notch fracture

Class 2: Degenerative (ulnocarpal abutment syndrome) stage

•A - TFCC wear

•B - TFCC wear with lunate and/or ulnar chondromalacia

•C - TFCC perforation with lunate and/or ulnar chondromalacia

•D - TFCC perforation with lunate and/or ulnar chondromalacia and LT ligament perforation

•E - TFCC perforation with lunate and/or ulnar chondromalacia, LT ligament perforation, and ulnocarpal arthritis