Nucleus Disc Replacement: Design and Material Selection FEA Analysis

Table 1

Bionate® nucleus replacement properties comparing the three types of this material. We shaded the maximum results in blue.

Nucleus replacement data with Bionate®		80 A	90 A	55D
Z-axis displacement (mm) under 1000 N axial compression load		1.159	1.02	0.93
Z-axis displacement (mm) under 1000 N axial load + 300 N anteroposterior shear		1.76	1.517	1.342
Z-axis displacement (mm) under 1000 N axial load + 8 Nm flexion moment + 8 Nm rotation torque		1.839	1.554	1.361
Maximum stresses under 1000 N axial compression load	Sx (MPa)	5.1	5.42	5.38
	Sy (MPa)	5.35	5.79	5.84
	Sz (MPa)	5.5	6	6.22
Maximum stresses under 1000 N axial compression load + 300 N anteroposterior shear	Sx (MPa)	6.33	8.5	10.4
	Sy (MPa)	6.55	8.9	10.9
	Sz (MPa)	7.05	9.6	11.7
Maximum stresses under 1000 N axial load + 8 Nm flexion moment + 8 Nm rotation torque	Sx (MPa)	6.7	11.6	11.3
	Sy (MPa)	6.6	11.3	11.5
	Sz (MPa)	7.2	12.1	12.6