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

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

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

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

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

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

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