Skip to main content

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