Assessment of mechanical properties of isolated bovine intervertebral discs from multi-parametric magnetic resonance imaging

Table 5 Coefficient of determination R ² , standard error of estimate (MPa for E and H _A0 , e ^-15 m ⁴ /Ns for k _r , k ₀ and k _a ) and power of the performed test with α=0.05 of the multilinear regressions between the mechanical properties and the MRI parameters for the nucleus pulposus and the annulus fibrosus

Coefficient of determination R²Standard error of estimate Power with α=0.05	E	k_r	H_A0	k₀	k_a
*Nucleus Pulposus*
In-situ	0.48	0.53	0.48	0.49	0.70
	0.04	55.6	0.08	73.4	1.2
	0.73	0.79	0.72	0.74	0.95
Digested-6h	0.48	0.62	0.34	0.45	0.67
	0.007	34.6	0.06	15.6	2.2
	0.67	0.85	0.47	0.63	0.90
Digested-18h	0.68	0.62	0.45	0.34	0.55
	0.01	151.9	0.05	21.9	2.1
	0.91	0.85	0.63	0.48	0.76
Digested-24h	0.65	0.63	0.27	0.38	0.41
	0.006	173.7	0.03	24.5	3.2
	0.91	0.90	0.41	0.58	0.63
*Annulus Fibrosus*
In-situ	0.52	0.17	0.65	0.65	0.48
	0.03	9.8	0.14	40.4	3.6
	0.78	0.26	0.91	0.88	0.73
Digested-6h	0.15	0.52	0.49	0.39	0.45
	0.02	41.7	0.06	62.5	2.1
	0.21	0.73	0.72	0.49	0.63
Digested-18h	0.70	0.66	0.63	0.32	0.48
	0.01	13.1	0.03	266.2	2.2
	0.92	0.89	0.86	0.44	0.68
Digested-24h	0.01	0.80	0.21	0.32	0.71
	0.93	35.1	0.07	34.1	1.6
	0.67	0.99	0.32	0.48	0.95

ISSN: 1471-2474