Diagnostic Implication and Clinical Relevance of Dermatomal Somatosensory Evoked Potentials in Patients with Radiculopathy: A Retrospective Study

Table 4

Comparison of size (pixel counts) and stenosis grade of IVF and spinal canal according to DSEP findings.

	L4 DSEP				L5 DSEP
	Normal (n = 74)	Delay (n = 24)	Absence (n = 20)		Normal (n = 31)	Delay (n = 75)	Absence (n = 15)
Pixel counts of IVF^†	237.3 ± 78.84	183.5 ± 77.94	179.4 ± 45.64	0.001	209.7 ± 69.01	175.9 ± 76.04	158.3 ± 55.40	0.022
Grade of IVF stenosis^†	0.78 ± 0.85	0.96 ± 0.81	1.00 ± 0.80	0.245	0.71 ± 0.82	0.89 ± 0.80	1.13 ± 0.99	0.282
Pixel counts of thecal sac area	547.4 ± 275.4	595.8 ± 344.0	586.4 ± 207.9	0.497	423.2 ± 249.7	418.2 ± 178.5	391.8 ± 159.1	0.919
Grade of spinal stenosis	1.40 ± 0.66	1.41 ± 0.71	1.35 ± 0.67	0.864	1.61 ± 0.80	1.46 ± 0.71	1.47 ± 0.74	0.627

Date are presented as mean ± SD. . ^†L4/5 level in L4 DSEP or L5/S1 level in L5 DEP. DSEP, dermatomal somatosensory evoked potentials; IVF, intervertebral foramen.