Table 6.

Recommended design parameters

Parameter	Recommended value	Reference
Disk pressure, after implantation	1.50 MPa	Fig. 1
Disk pressure, maximal	2.30 MPa	[30]
Tensile modulus, axial	0.5–1 MPa	Fig. 2, Table 4
Compressive/tensile strain	28%/65%	Table 2
Axial stiffness of restored IVD	1.5–2 kN/mm	Table 3
Torsional stiffness of restored IVD	3.2 N m/deg	Table 3
Tensile modulus, circumferential	11–29 MPa	Fig. 2, Table 4
Aggregate modulus	0.4–6 MPa	Table 4
Shear modulus	0.1–0.28 MPa	Table 4