Table 1.

Anatomic structure distance by level

	L1–2	L2–3	L3–4	L4–5	L5–S1
Distance between anterior intervertebral plane and lumbar plexus (b)	30.8	28.6	28.2	22.1	0.4
Distance between lateral disc and medial lumbar plexus (f)		2.7	3.2	4.7	11.2
Distance between anterior intervertebral plane and femoral nerve (b)			33.5	26.8	6.2
Distance between anterior intervertebral plane and right IVC/iliac vein (d)	−4.3	−1.3	0	2.1	4.9
Distance between anterior intervertebral plane and anterior psoas (a)	8.1	1.8	−3.8	−11.6	−31.5

Values are in mm. Letters in parenthesis are Fig. 3 labels