Table 1 Demographic characteristics
Characteristic | Patients with ASD (n = 33) | Control (n = 33) | P value |
|---|---|---|---|
Age at surgery, (yrs), mean ± SD | 62.30 ± 10.80 | 62.90 ± 10.73 | 0.820 |
Gender, n (%) | 1.000 | ||
Male | 14 (42.4) | 14 (42.4) | |
Female | 19 (57.6) | 19 (57.6) | |
Bone density, HU value, mean ± SD | 113.55 ± 36.66 | 133.13 ± 38.11 | 0.037* |
Preoperative LL, (°), mean ± SD | 52.40 ± 7.17 | 50.24 ± 6.98 | 0.218 |
Preoperative SS, (°), mean ± SD | 34.88 ± 5.21 | 35.26 ± 5.84 | 0.778 |
Number of fusion segments, n (%) | 1.000 | ||
1 | 16 (48.5) | 16 (48.5) | |
2 | 17 (51.5) | 17 (51.5) | |
Preoperative Pfirrmann’s grade at the proximal adjacent segment of surgery, n (%) 0.769 | |||
I | 1 | 1 | |
II | 5 | 3 | |
III | 15 | 19 | |
IV | 8 | 9 | |
V | 4 | 1 | |
Preoperative Pfirrmann’s grade at the distal adjacent segment of surgery, n (%) 0.304 | |||
I | 0 | 0 | |
II | 1 | 1 | |
III | 8 | 11 | |
IV | 6 | 3 | |
V | 0 | 0 | |
Initial fusion segment, n (%) | 1.000 | ||
L3–4 | 5 (15.2) | 5 (15.2) | |
L4–5 | 3 (9.1) | 3 (9.1) | |
L5–S1 | 8 (24.2) | 8 (24.2) | |
L3–5 | 7 (21.2) | 7 (21.2) | |
L4–S1 | 10 (30.3) | 10 (30.3) | |
Follow-up years, (yrs), median (IQR) | 5.2 (4.0) | 5.0 (4.1) | 0.639 |