Seven segments used to determine the location of the great saphenous vein. Using an axial image, we divided the region from the anterior edge of the tibia to the posteromedial edge into five segments (A, B, C, D, and E), and designated the segment that was anterior to the anterior edge as ‘AA’ and the segment that was posterior to the posterior edge as ‘P.’ The course of the great saphenous vein through these segments at heights 1–4 described in Fig. 1 was evaluated.