Table 2.

Data of clinical and actual small saphenous vein positions and ratios to the width of Achilles tendon.

Patients	Checkpoint 1 (cm)		Checkpoint 2 (cm)		Checkpoint 3 (cm)
	CP/WAT	AP/WAT	CP/WAT	AP/WAT	CP/WAT	AP/WAT
1	2.85/3.50	1.05/3.50	3.20/3.00	1.90/3.00	3.35/2.50	2.35/2.50
2	2.70/3.40	1.10/3.40	2.90/2.80	1.90/2.80	3.00/2.40	2.20/2.40
3	3.20/3.80	0.90/3.80	3.35/3.10	2.25/3.10	3.60/2.60	2.80/2.60
4	2.40/3.00	1.00/3.00	2.65/2.50	1.65/2.50	2.85/2.10	2.05/2.10
5	3.10/3.80	1.20/3.80	3.05/2.90	2.05/2.90	3.30/2.60	2.70/2.60
6	2.65/3.30	0.95/3.30	2.95/2.70	1.85/2.70	2.70/2.20	2.00/2.20
7	3.25/3.90	0.75/3.90	3.55/3.30	2.45/3.30	3.80/2.80	3.00/2.80
8	2.95/3.50	0.95/3.50	3.25/2.90	2.15/2.90	3.40/2.40	2.50/2.40
9	2.20/2.80	1.00/2.80	2.55/2.30	1.65/2.30	2.45/1.90	1.65/1.90
10	3.40/4.00	0.50/4.00	3.80/3.40	2.70/3.40	4.05/2.90	3.15/2.90
11	2.90/3.40	1.10/3.40	3.15/3.10	2.35/3.10	3.35/2.50	2.45/2.50
12	2.70/3.20	0.80/3.20	3.25/2.90	2.25/2.90	3.25/2.30	2.15/2.30
13	2.35/2.90	0.95/2.90	2.90/2.80	1.90/2.80	2.80/2.00	1.90/2.00
14	2.50/3.20	1.00/3.20	2.70/2.60	1.70/2.60	3.00/2.20	2.20/2.20
15	3.00/3.60	1.20/3.60	2.95/2.90	2.35/2.90	3.60/2.80	2.90/2.80
16	3.35/4.10	0.65/4.10	3.55/3.50	2.65/3.50	3.75/3.10	3.15/3.10

Checkpoint 1; 10 cm proximal to calcaneal insertion; checkpoint 2: 8 cm proximal to calcaneal insertion; checkpoint 3: 6 cm proximal to calcaneal insertion. Take the midline of Achilles tendon as the “0” point. CP: clinical position: the distance from the sural nerve located by body surface location point to the midpoint of Achilles tendon; AP: actual position: the distance from the sural nerve located by ultrasonography to the midpoint of Achilles tendon; WAT; width of Achilles tendon: the distance from the medial edge to the lateral edge of the Achilles tendon on each plane.