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Table 3 Comparison of the preoperative, 1 year, and final follow-up radiologic parameters in each group

From: Can posterior stand-alone expandable cages safely restore lumbar lordosis? A minimum 5-year follow-up study

 

Stand-alone expandable cage fusion (n = 69)

Screw-assisted fusion (n = 80)

P value

Pre-op

1 year

Final

Δ Parameter

Pre-op

1 year

Final

Δ parameter

Segmental angle, degree, mean (SD)

0.54 (3.50)

5.17

(2.39)

4.31 (3.97)

4.66 (3.76)

0.88 (3.21)

5.35

(1.98)

4.29 (3.52)

2.03 (1.16)

.000079a*

Translation, mm, mean (SD)

3.62 (1.88)

1.59

(1.72)

1.60 (1.37)

2.02 (1.57)

3.05 (1.59)

1.85

(0.92)

0.95 (1.10)

1.66 (1.39)

.95a

Short lumbar lordosis, degree, mean (SD)

14.03 (10.17)

17.41

(10.45)

16.76 (12.74)

2.73 (9.82)

16.66 (12.87)

17.80

(10.55)

17.71 (9.99)

1.05 (9.26)

.28a

Whole lumbar lordosis, degree, mean (SD)

28.50 (16.17)

28.79

(15.13)

29.02 (17.04)

0.52 (13.79)

31.43 (16.94)

32.45

(14.51)

33.40 (14.62)

1.97 (12.55)

.50a

Pelvic incidence, degree, mean (SD)

54.73 (10.02)

56.17

(9.05)

55.44 (9.08)

− 0.68 (11.21)

55.83 (8.96)

56.47

(10.40)

55.97 (10.26)

− 0.13 (8.08)

.72a

Pelvic tilt, degree, mean (SD)

30.80 (9370)

45.47

(12.75)

29.50 (10.41)

− 1.30 (10.79)

28.04 (9.34)

40.92

(11.57)

27.20 (9.16)

− 0.83 (9.20)

.77a

Sacral slope, degree, mean (SD)

24.01 (8.20)

10.70

(12.84)

28.84 (8.00)

4.48 (14.24)

28.04 (8.73)

15.55

(11.16)

28.84 (8.75)

− 1.51 (13.58)

.0026a*

Thoracic kyphosis, degree, mean (SD)

4.69 (3.69)

8.69

(5.43)

7.99 (3.89)

3.29 (2.18)

4.53 (3.26)

8.67

(4.78)

8.24 (3.71)

3.70 (2.64)

.06a

Sagittal vertical axis, cm, mean (SD)

4.10 (1.93)

4.13

(1.87)

4.11 (2.26)

0.01 (2.57)

4.14 (2.33)

4.41

(1.88)

4.13 (2.33)

0.50 (2.10)

.07a

  1. aIndependent Student’s t test
  2. *P < .05
  3. Pre-op preoperative, SD standard deviation