Table 3.
Surgical variables and follow-up data
| Variable | Overall (n=351) | Hardware failure |
p-value† | |
|---|---|---|---|---|
| No (n=328) | Yes (n=23) | |||
| Instrumented levels | 5 (3–11) | 5 (3–11) | 5 (3–7) | 0.218 |
| Screw cement augmentation | 48 (14) | 45 (14) | 3 (13) | > 0.999 |
| Vertebral body replacement | 81 (23) | 73 (22) | 8 (35) | 0.196 |
| Pelvic fixation | 10 (2.8) | 5 (1.5) | 5 (22) | < 0.001* |
| SMII | 13 (3–27) | 13 (3–27) | 14 (7–21) | 0.019* |
| Ambulatory status after surgery | 0.162 | |||
| Nonambulatory | 44 (13) | 44 (13) | 0 (0) | |
| Walking with assistive devices | 40 (11) | 37 (11) | 3 (13) | |
| Ambulatory | 267 (76) | 247 (75) | 20 (87) | |
| Local recurrence | 82 (23) | 72 (22) | 10 (43) | 0.025* |
| Survivors of more than 1 year | 199 (57) | 181 (55) | 18 (78) | 0.048* |
| Survivors of more than 5 years | 28 (8.0) | 21 (6.4) | 7 (30) | < 0.001* |
Values are presented as median (range) or number (%).
SMII, spinal metastasis invasiveness index.
*
p<0.05, statistically significant difference.
†
Approximative (Monte Carlo) Pearson chi-square test, Wilcoxon rank-sum test.