Table 2.

Values of the mean iROM [degrees] C2/3, C3/4 and C4/5 in both cadaver groups in flexion-extension, lateral bending, and axial rotation and changes [%] of the fused condition and the state with TDR in relation to the intact situation

iROM, F/E	Intact			Arthrodesis			TDR Type D
Group 1	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5
Mean	8.22	11.74	14.89	8.64	1.62*	15.88*	9.37*#	19.31*#	16.63*#
SD	2.48	1.85	2.35	2.92	1.20	2.90	3.09	4.68	2.95
Change [%]				5.06	−86.18	6.66	13.93	64.58	11.65
iROM, LB	Intact			Arthrodesis			TDR Type D
Group 1	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5
Mean	21.38	20.89	23.57	21.55	4.77*	23.94	22.84	21.72#	22.84
SD	4.82	2.52	3.00	4.39	2.93	3.36	4.14	6.85	3.99
Change [%]				0.80	−77.15	1.57	6.84	3.97	−3.10
iROM, AR	Intact			Arthrodesis			TDR Type D
Group 1	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5
Mean	5.52	5.44	7.69	6.36	4.59	8.52	6.31	10.93	13.26*#
SD	2.20	1.73	3.70	2.35	2.60	3.13	2.44	4.37	2.83
Change [%]				15.27	−15.50	10.77	14.32	100.95	72.31
iROM, F/E	Intact			Arthrodesis			TDR Type A
Group 2	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5
Mean	9.52	11.54	13.55	10.65*	4.38*	14.76*	10.88*	16.01#	15.01*
SD	3.33	1.31	1.60	3.68	2.92	1.70	3.74	5.35	1.52
Change [%]				11.85	−62.01	8.92	14.29	38.69	10.75
iROM, LB	Intact			Arthrodesis			TDR Type A
Group 2	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5
Mean	21.36	21.16	22.89	22.22	10.11*	23.87	22.89	21.00	23.53
SD	2.69	3.56	1.80	4.17	3.50	1.60	4.23	13.38	2.96
Change [%]				4.05	−52.23	4.28	7.17	−0.77	2.83
iROM, AR	Intact			Arthrodesis			TDR Type A
Group 2	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5	C2/3	C3/4	C4/5
Mean	8.11	7.46	6.48	6.37	4.45	7.06*	5.98	9.72	10.71
SD	5.12	3.12	2.45	2.40	1.55	2.01	2.32	5.30	3.94
Change [%]				−21.44	−40.31	9.03	−26.20	30.26	65.37

SD means standard deviation.

F/E = Flexion-Extension, LB = Lateral Bending, AR = Axial Rotation. *indicates significant differences to intact state, # indicates significant differences between TDR and arthrodesis.