Biomechanical Effect of Disc Height on the Components of the Lumbar Column at the Same Axial Load: A Finite-Element Study

Table 1

Information on mesh and material properties for the finite element model of the vertebral body.

Item (mesh size)			Number of nodes	Number of elements	Elastic modulus, E (MPa)	Poisson's ratio (ν)	Reference
Cortical bone (3 mm)			69,667	37,138	12,000	0.3	[23]
Cancellous bone (5 mm)			71,381	47,169	200	0.25	[23]
Posterior bone (4 mm)			37,963	20,990	3,500	0.25	[23]
Endplate (2 mm)			30,204	13,537	1,000	0.3	[23]
Facet joint (2 mm)			1,842	474	11	0.4	[24]
Nucleus pulposus (3 mm)	100%		346,396	239,611	1	0.49	[23]
	Posterior	75%	343,307	237,389
		50%	339,608	234,645
	Anterior	75%	342,039	236,368
		50%	337,141	232,928
Annulus fibrosus (3 mm)	100%		358,484	239,295	4.2	0.45	[23]
	Posterior	75%	351,189	233,959
		50%	344,576	229,112
	Anterior	75%	350,436	233,370
		50%	341,288	226,898

MPa, megapascal.