Table 1.

Maximum compressive stresses on the anterior column of the UIV and UIV + 1 vertebrae at various T1 tilts on T1 UIV model with or without posterior tethers.

Level	C7 (UIV + 1) [MPa]			T1 (UIV) [MPa]
T1 tilt	Control	T1 UIV	T1 + Tether	Control	T1 UIV	T1 + Tether
0 deg.	0.29	0.13	0.22	3.50	1.08	1.56
20 deg.	0.52	0.40	0.19	3.89	1.21	1.13
40 deg.	0.68	0.75	0.45	6.41	1.57	0.96