Table 3 Radiological outcomes

ROM of surgical segment (°)

 TTL (n = 24)

8.62 ± 0.75

2.26 ± 0.48

2.83 ± 0.47

3.61 ± 0.65

 Rigid (n = 21)

8.49 ± 0.64

1.84 ± 0.33

1.65 ± 0.33

1.44 ± 0.29

P value

0.656

0.002

0.000

0.000

ROM of upper adjacent segment (°)

 TTL (n = 24)

6.78 ± 1.26

7.25 ± 1.14

7.64 ± 1.02

8.51 ± 1.07

 Rigid (n = 21)

7.07 ± 1.15

7.69 ± 0.97

8.25 ± 0.85

9.32 ± 0.86

P value

0.546

0.279

0.062

0.012

DH of surgical segment (mm)

 TTL (n = 48)

8.26 ± 1.15

8.26 ± 1.14

8.16 ± 1.18

7.93 ± 1.28

 Rigid (n = 42)

8.41 ± 1.10

8.48 ± 1.05

8.03 ± 0.98

7.47 ± 0.91

P value

0.457

0.359

0.472

0.068

DH of upper adjacent segment (mm)

 TTL (n = 24)

10.72 ± 0.93

10.69 ± 0.93

10.16 ± 0.95

9.45 ± 0.90

 Rigid (n = 21)

10.87 ± 0.75

10.84 ± 0.79

10.15 ± 0.77

8.94 ± 0.74

P value

0.545

0.569

0.900

0.062

LL (°)

 TTL (n = 24)

27.25 ± 4.41

36.25 ± 3.96

37.25 ± 3.45

38.04 ± 3.74

 Rigid (n = 21)

25.43 ± 3.50

36.43 ± 3.97

37.04 ± 4.34

37.57 ± 4.04

P value

0.135

0.873

0.909

0.715

Modified Pfrrmann grading of surgical segment

 TTL (n = 48)

5.67 ± 1.08

N

N

6.00 ± 1.71

 Rigid (n = 42)

5.45 ± 0.59

N

N

6.36 ± 0.79

P value

0.212

0.076

Modified Pfrrmann grading of upper adjacent segment

 TTL (n = 24)

3.62 ± 0.49

N

N

4.54 ± 0.51

 Rigid (n = 21)

3.71 ± 0.46

N

N

4.62 ± 0.50

P value

0.531

0.604