Biomechanical differences between two different shapes of oblique lumbar interbody fusion cages on whether to add posterior internal fixation system: a finite element analysis

Table 1 Material properties used by finite element model

Component	Young’s modulus (MPa)	Poisson’s ratio	Cross-sectional area (mm²)
Vertebra
Cortical bone	12,000	0.3
Cancellous bone	100	0.2
Posterior element	3500	0.25
Sacrum	5000	0.2
Facet	11	0.2
Disk
Endplate	24	0.4
Nucleus pulpous	1	0.49
Annulus ground substance stance	4	0.4
Annulus fibers	360–550		0.15
Ligaments
ALL	7.8		63.7
PLL	10		20
LF	15		40
CL	7.5		30
ISL	10		40
SSL	8		30
ITL	10		1.58
Implants
Cage	3600
Screws and roots	110,000

ALL anterior longitudinal ligament; PLL posterior longitudinal ligament; LF ligamentum flavum; CL capsule ligament; ISL interspinous ligament; SSL supraspinous ligament; ITL intertransverse ligament

ISSN: 1749-799X