Classic portals in wrist arthroscopy. 3–4 portal is usually the first portal to be opened. It lays on the soft spot, 1 cm distal to the Lister’s tubercle, between the third and fourth extensor compartments. 4–5 portal is located between the fourth and fifth extensor compartments. 6R and 6 U portals are radial and ulnar to the sixth extensor compartment, respectively. The RMC portal lays distal to the 3–4 portal in the axis of the basis of the second metacarpal, whereas the UMC portal lays distal to the 4–5 portal in the direction of the basis of the fourth metacarpal. RMC, Radial Mid-Carpal; UMC, Ulnar Mid-Carpal (m); Metacarpal.