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 |