. Author manuscript; available in PMC: 2022 Jun 17.

Published in final edited form as: J Magn Reson Imaging. 2014 Jun 3;41(3):654–664. doi: 10.1002/jmri.24624

Table 1.

Displacement, hydration state and mechanical properties of the disc by age, grade of degeneration and compressive load.

Age	Grade	Displacement (mm)		Hydration State (TE0: tissue / saline)				Mechanical characterization
				Nucleus		Annulus
		200N	800N	200N	800N	200N	800N	S_D	E₁	E₂	η₁
39	II	0.38	0.62	1.13	1.20	0.88	0.84	4430	5.84	16.5	2.31
65	III	0.51	0.84	1.04	1.10	1.01	1.04	2050	5.05	6.5	1.11
69	III	0.48	0.78	1.07	1.03	0.77	0.89	2300	5.27	8.43	1.35
72	III	0.71	1.09	1.03	1.00	0.99	0.93	1630	3.68	6.29	1.08
81	IV	0.90	1.35	0.74	0.72	0.91	1.07	1050	2.16	4.6	0.95

Grade: Degenerative state classified in accordance to the T2 relaxation scheme proposed by Watanabe et al, ⁴². Displacement: Displacement applied to the disc for the MR experiment. S_D (N/mm): Dynamic stiffness computed from the linear region of the loading phase at the tenth load of the compression cyclic test. E1 (Mpa): Instantaneous stiffness. E2 (Mpa): Long term stiffness. η1 (N/sec²): Damping coefficient.