Anatomical Location of the Common Iliac Veins at the Level of the Sacrum: Relationship between Perforation Risk and the Trajectory Angle of the Screw

Table 6

Locations of common iliac veins and inferior vena cava formation in 20 cadavers.

Cadaver	R-CIV/P (mm)	L-CIV/P (mm)	R-CIV/L-CIV (mm)	IVC/P (mm)
1	37.1	27.3	64.2	52.3
2	33.3	28.4	61.3	47.4
3	19.2	20.1	39.4	16.3
4	40.2	18.3	58.2	20.6
5	19.1	23.2	42.3	18.3
6	29.3	2.8	31.8	14.9
7	32.8	14.6	47.4	28.3
8	30.6	30.8	61.4	47.4
9	36.1	24.7	61.3	35.2
10	28.9	16.3	43.2	23.3
11	26.3	23.7	50.3	43.9
12	24.2	36.4	60.6	43.5
13	26.1	5.8	31.9	21.7
14	32.5	7.1	39.6	18.7
15	27.2	31.5	58.5	46.2
16	42.3	32.3	74.3	41.3
17	24.3	6.6	31.8	16.4
18	21.8	13.3	35.2	19.2
19	38.3	11.4	49.7	23.1
20	27.1	23.5	50.2	28.8
Mean	29.7	19.8	49.5	30.2
Minimum	19.1	2.8	31.8	14.9
Maximum	42.3	36.4	74.3	52.3
SD	±6.66	±9.86	±12.46	±12.83

R-CIV/P: distance between the right common iliac vein and the center of promontorium; L-CIV/P: distance between the left common iliac vein and the center of promontorium; R-CIV/L-CIV: distance between the right common iliac vein and the left common iliac vein; IVC/P: distance between the level of inferior vena cava formation and the tip of promontorium; SD: standard deviation.