There are typical points where incompetent valves occur between the superficial and the deep veins. In these regions the varicosities tend to become marked. The typical sites are: at the saphena varix—the saphenofemoral junction where the femoral vein is joined by the great saphenous vein; in the midthigh perforating vein between the great saphenous vein and the femoral vein; in the calf the three sites where perforators occur, 5, 10, and 15 cm above the medial malleolus between the great saphenous vein and the deep veins of the calf; and at the junction of the small saphenous vein and the popliteal vein.