Table 1.
Tumor characteristics
| Variable | Overall (n=351) | Hardware failure |
p-value† | ||
|---|---|---|---|---|---|
| No (n=328) | Yes (n=23) | ||||
| Tumor type | 0.829 | ||||
| Cancer of unknown primary site | 6 (1.7) | 6 (1.8) | 0 (0) | ||
| Other (soft tissue sarcoma, germ cell tumor, ovary, adrenal) | 34 (9.7) | 30 (9.1) | 4 (17) | ||
| Stomach | 2 (0.6) | 2 (0.6) | 0 (0) | ||
| Skin (melanoma, basalioma) | 9 (2.6) | 8 (2.4) | 1 (4.3) | ||
| Lung | 27 (7.7) | 26 (7.9) | 1 (4.3) | ||
| Lymphoma | 5 (1.4) | 5 (1.5) | 0 (0) | ||
| Multiple myeloma | 27 (7.7) | 25 (7.6) | 2 (8.7) | ||
| Breast | 86 (25.0) | 80 (24.0) | 6 (26.0) | ||
| Bladder | 2 (0.6) | 2 (0.6) | 0 (0) | ||
| Osteosarcoma | 3 (0.9) | 3 (0.9) | 0 (0) | ||
| Liver | 3 (0.9) | 2 (0.6) | 1 (4.3) | ||
| Plasmacytoma | 8 (2.3) | 8 (2.4) | 0 (0) | ||
| Kidney | 79 (23) | 73 (22.0) | 6 (26.0) | ||
| Prostate | 16 (4.6) | 16 (4.9) | 0 (0) | ||
| Corpus uteri | 8 (2.3) | 8 (2.4) | 0 (0) | ||
| Colon | 9 (2.6) | 9 (2.7) | 0 (0) | ||
| Chondrosarcoma | 6 (1.7) | 5 (1.5) | 1 (4.3) | ||
| Chordoma | 9 (2.6) | 8 (2.4) | 1 (4.3) | ||
| Cervix uteri | 9 (2.6) | 9 (2.7) | 0 (0) | ||
| Thyroid | 3 (0.9) | 3 (0.9) | 0 (0) | ||
| SINS region | 0.587 | ||||
| Junctional | 156 (44.0) | 143 (44.0) | 13 (57.0) | ||
| Mobile spine | 90 (26.0) | 85 (26.0) | 5 (22.0) | ||
| Rigid | 13 (3.7) | 13 (4.0) | 0 (0) | ||
| Semirigid | 92 (26.0) | 87 (27) | 5 (22.0) | ||
| No. of affected vertebrae | 0.493 | ||||
| 1 | 277 (79.0) | 259 (79.0) | 18 (78.0) | ||
| 2 | 41 (12.0) | 38 (12.0) | 3 (13.0) | ||
| 3 | 27 (7.7) | 25 (7.6) | 2 (8.7) | ||
| 4 | 4 (1.1) | 4 (1.2) | 0 (0) | ||
| 5 | 2 (0.6) | 2 (0.6) | 0 (0) | ||
| Spine metastasis number | 0.959 | ||||
| Multiple | 60 (17) | 56 (17) | 4 (17) | ||
| Several (3 or less) | 103 (29) | 97 (30) | 6 (26) | ||
| Solitary | 188 (54) | 175 (53) | 13 (57) | ||
| Preoperative radiotherapy | 21 (6.0) | 20 (6.1) | 1 (4.3) | > 0.999 | |
| Preoperative bone-modifying agent therapy | 69 (20.0) | 67 (20.0) | 2 (8.7) | 0.184 | |
Values are presented as number (%).
SINS, spinal instability neoplastic score.
†
Approximative (Monte Carlo) Pearson chi-square test.