Lumbar Dorsal Root Ganglia Location: An Anatomic and MRI Assessment

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Fig. 1
DRG region. Zone 1 and 2: intraspinal; Zone 3: medial neuroforamina; Zone 4: lateral neuroforamina; Zone 5: extraforaminal space.
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Fig. 2
DRG Size (mm). Width is the width of DRG at the pin (maximal width of DRG). The nerve root angle is determined from sin(O) calculated by the right/diagonal lines relative to the width.

Table 1

Lumbar Spine Demographic.

DRG Size (mm)	Left					Right
	L1	L2	L3	L4	L5	L1	L2	L3	L4	L5
Width: mean	3.2	4.3	4.9	6.1	6.5	3.2	4.3	4.9	6.1	6.5
Width: sem	0.7	0.4	0.3	0.4	0.5	0.7	0.4	0.3	0.4	0.5
DRG Region	Left					Right
	L1	L2	L3	L4	L5	L1	L2	L3	L4	L5
Zone: mean	3.0	3.0	3.5	3.9	4.3	3.0	3.1	3.5	3.8	4.2
Zone: sem	0.3	0.1	0.1	0.1	0.1	0.3	0.2	0.1	0.1	0.1
Intervertebral Foramina Size (mm)	Left					Right
	L1	L2	L3	L4	L5	L1	L2	L3	L4	L5
AP: mean	6.6	7.4	7.6	8.4	8.7	6.8	7.2	7.4	8.5	8.6
AP: sem	0.2	0.2	0.3	0.4	0.4	0.4	0.2	0.3	0.2	0.4
PP: mean	7.2	8.1	9.4	10.1	10.1	7.3	8.5	9.4	10.4	10.3
PP: sem	1.8	0.7	0.8	0.8	0.7	1.8	0.7	0.8	0.8	0.7
Pedicle width (medial to lateral) (mm)	Left					Right
	L1	L2	L3	L4	L5	L1	L2	L3	L4	L5
Width: mean	7.0	7.0	7.8	8.7	9.7	6.7	7.1	7.9	8.9	9.7
Width: sem	0.3	0.3	0.2	0.3	0.4	0.2	0.3	0.2	0.4	0.4
Nerve Root Angle	Left					Right
	L1	L2	L3	L4	L5	L1	L2	L3	L4	L5
Angle (rounded to nearest 10th)	50.5	52.2	55.2	57.4	58.8	50.5	52.2	55.2	57.2	56.3

Key: DRG Region zone 1 and 2: intraspinal; zone 3: medial neuroforamina; zone 4: lateral neuroforamina; zone 5: extraforaminal space. Intervertebral Foraminal Size. Anteriorposterior (AP): maximal distance from posterior body/disk to facet joint. Pedicle to pedicle (PP) distance: inferior border of upper to superior border of lower pedicle. SEM: standard error of the mean. Angle determined via sin(O) = right/diagonal.

Table 2