Table 4.

The Venous Segmental Disease Score

Reflux	Obstruction
½ Lesser saphenous thrombosed	1 Greater saphenous (only if from groin to below knee)
1 Greater saphenous	1 Calf veins, multiple
½ Perforators, thigh	2 Popliteal vein
1 Perforators, calf	1 Superficial femoral vein
2 Calf veins, multiple (posterior tibial vein alone = 1)	1 Profunda femoris vein
2 Popliteal vein	2 Common femoral vein
1 Superficial femoral vein	1 Iliac vein
1 Profunda femoris vein	1 Inferior vena cava
1 Common femoral vein and above
10 Maximum reflux score	10 Maximum obstruction score