Interlaminar stabilization offers greater biomechanical advantage compared to interspinous stabilization after lumbar decompression: a finite element analysis

Table 1 Material properties assigned to the FE model

Component	Element type	Young modulus (MPa)	Poisson ratio	Cross-sectional area (mm²)
Bone
Cortical bone	C3D4	12,000	0.3
Cancellous bone	C3D4	100	0.2
Cartilage endplate	C3D8	24	0.4
Intervertebral disc
Nucleus pulpous	C3D8	1	0.49
Annulus ground substance	C3D8H	Hyperelastic (C10 = 0.18, C01 = 0.045)
Annulus fibers	T3D2	Hypoelastic (360–550 MPa)
Ligaments
Anterior longitudinal	T3D2	15.6 (< 12%), 20 (> 12%)		63.7
Posterior longitudinal	T3D2	10 (< 11%), 20 (> 11%)		20
Ligamentum flavum	T3D2	15 (< 6.2%), 19.5 (> 6.2%)		40
Capsular	T3D2	7.5 (< 25%), 32.9 (> 25%)		30
Interspinous	T3D2	10 (< 20%), 11.6 (> 20%)		40
Supraspinous	T3D2	8.0 (< 20%), 15 (> 20%)		30
Intertransverse	T3D2	10 (< 18%), 58.7 (> 18%)		2
Implants
Coflex device, screws, and rods (titanium)	C3D4	110,000	0.3

ISSN: 1749-799X