Table 2.

Anatomical lumbar changes following use of the iO-Flex^® system and of hemilaminotomy with foraminotomy in stenotic cadaveric specimens

Variable, mean ± SD	iO-Flex system (n = 12)			Hemilaminotomy with foraminotomy (n = 12)			P§
	Pre	Post	Δ	Pre	Post	Δ
Spinal canal
Laminar width, cm	1.63 ± 0.27	1.17 ± 0.46	−0.46†	1.53 ± 0.25	0.71 ± 0.36	−0.82†	0.03
Facet morphology
Facet width, cm	1.62 ± 0.39	1.33 ± 0.48	−0.28†	1.61 ± 0.45	0.91 ± 0.50	−0.70*	0.03
Lateral recess
Lateral recess diameter, cm	0.42 ± 0.11	0.60 ± 0.18	0.18†	0.42 ± 0.14	0.45 ± 0.15	0.03	0.02
Foramen
Foraminal width, cm	0.89 ± 0.23	1.10 ± 0.24	0.21*	0.91 ± 0.25	0.95 ± 0.28	0.04	0.01

Notes: Within-group significance value:

^*P < 0.001;

^†P < 0.01.

^§Between-group significance value.