Nucleus Disc Replacement: Design and Material Selection FEA Analysis

Table 2

Maximum annulus stresses with the selected design nucleus replacement made of Bionate® 80 A, 90 A, and 55D.

Annulus stress with nucleus replacement with Bionate®		80 A	90 A	55D
Maximum stresses under 1000 N axial compression load	Sx (MPa)	1.27	1.25	1.24
	Sy (MPa)	1.21	1.2	1.17
	Sz (MPa)	1.64	1.63	1.61
Maximum stresses under 1000 N axial compression load + 300 N anteroposterior shear	Sx (MPa)	1.5	1.2	1.12
	Sy (MPa)	1.48	1.12	1
	Sz (MPa)	2.16	1.7	1.6
Maximum stresses under 1000 N axial load + 8 Nm flexion moment + 8 Nm rotation torque	Sx (MPa)	1.66	1.3	1.14
	Sy (MPa)	1.63	1.2	1.1
	Sz (MPa)	2.1	1.8	1.71