Left wrist, seen from a dorsal perspective. Two Chinese finger traps are used for the distraction of the wrist. Number 1denotes the 3-4 portal (i.e., the primary inflow portal), number 2 the 6R-portal (i.e., the primary outflow portal), and 3 the 6U-portal (the secondary outflow portal). (ECU, tendon of extensor carpi ulnaris; EDC, tendon of extensor digitorum communis muscle; EDM, tendon of extensor digiti minimi muscle; EPL, tendon of the extensor pollicis longus muscle; L, Lister's tubercle.)