Biomechanical response of decompression alone in lower grade lumbar degenerative spondylolisthesis--A finite element analysis

Table 1 The mechanical properties in FE models [16,17,18,19,20]

Components	Element type	Young modulus [MPa]	Poisson ratio	Element numbers	Nodes Numbers/ Cross-sectional area [mm²]	Reference
Cortical bone	C3D4	E_xx=11,300	V_xy=0.484	172,529	57,992	[17, 18]
		E_yy=11,300	V_yz=0.203
		E_zz=22,000	V_xz=0.203
		G_xy=3,800
		G_yz=5,400
		G_xz=5,400
Cancellous bone	C3D4	E_xx=140	V_xy=0.45	205,959	53,421	[17, 18]
		E_yy=140	V_yz=0.315
		E_zz=200	V_xz=0.315
		G_xy=48.3
		G_yz=48.3
		G_xz=48.3
Sacrum	C3D4	5,000	0.2	232,755	58,374	[16]
Nucleus pulposus	C3D8H	1	0.4999	12,784	15,489	[18, 19]
Annulus fibrosus	C3D8H	4.2	0.45	13,440	17,280	[16, 18]
Endplate	C3D8R	100	0.4	7,717		[16, 20]
Cartilage	C3D8R	24	0.4	1,270	2,944	[16, 18]
ALL/PLL/IF/ISL/SSL/TL/CL	T3D2	20/5/5/1.5/5/10/7.5	0.3	20/20/20/6/3/3/24	63.7/7/14.1/14.1/10.5/0.6/10.5	[19, 20]

ISSN: 1749-799X