Table 4.
Hardware failures
| Patient No. | Age (yr) | Tumor type | Level | Surgery | Fixation | Screw augmentation | SMII | Hardware failure | Hardware_survival |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 49 | Breast | T8–10 | Circumferential decompression | T6, T7, T11, T12 | No | 19 | Bilateral rod breakage | 19 Days |
| 2 | 51 | Breast | T5 | Spondylectomy | T4, T6, VBR | No | 11 | DJF, LIV screw pullout, mesh subsid- ence | 21 Days |
| 3 | 69 | Breast | L5 | Circumferential decompression | L3, L4, S1, iliac | No | 13 | UIV screw pullout | 1 Month |
| 4 | 66 | Breast | T11 | Circumferential decompression | T7, T8, T10, L1, L2 | Yes | 17 | LIV screw pullout | 2 Months |
| 5 | 75 | Lung | L4 | Laminectomy | L3, L5, S1 | No | 9 | PJF | 3 Months |
| 6 | 69 | Chordoma | T11 | Spondylectomy | T9, T10, T12, L1, VBR | Yes | 17 | DJF, LIV screw pullout, mesh subsid- ence | 4 Months |
| 7 | 44 | Chondrosarcoma | T5–7 | Spondylectomy | T3, T4, T8, T9, VBR | No | 21 | Unilateral rod breakage | 6 Months |
| 8 | 55 | Breast | T1 | Spondylectomy | C6, C7, T2, T3, VBR | No | 15 | Mesh migration | 6 Months |
| 9 | 68 | Liver | L5 | Hemilaminectomy | L4, L5, S1 | No | 10 | Unilateral rod breakage | 6 Months |
| 10 | 71 | Kidney | T10–11 | Spondylectomy | T8, T9, T12, L1, VBR | No | 20 | LIV screw pullout, mesh migration | 6 Months |
| 11 | 59 | Salivary gland | T4 | Circumferential decompression | C7, T1, T2, T6, T7 | No | 15 | LIV screw pullout | 10 Months |
| 12 | 72 | Kidney | L5 | Circumferential decompression | L2, L3, S1, S2AI | No | 14 | Unilateral rod breakage | 10 Months |
| 13 | 42 | Kidney | T8 | Spondylectomy | T4, T5, T6, T7, T10, T11, VBR | No | 20 | Bilateral rod breakage, mesh subsidence | 1 Year |
| 14 | 57 | Kidney | L4 | Spondylectomy | L2, L3, L5, S1, VBR | Yes | 18 | UIV screw pullout | 1 Year 2 months |
| 15 | 59 | Kidney | L1 | Laminectomy | T12, L2 | No | 8 | Unilateral rod breakage | 1 Year 5 months |
| 16 | 52 | Breast | L4–5 | Laminectomy | L2, L3, L4, L5 | No | 14 | Screw breakage | 1 Year 6 months |
| 17 | 52 | Multiple myeloma | L3 | Circumferential decompression | L1, L2, L4, L5 | No | 13 | UIV screw pullout | 2 Years 1 months |
| 18 | 76 | Kidney | L2 | Circumferential decompression | T12, L1, L3, L4 | No | 14 | LIV screw pullout | 1 Year 11 months |
| 19 | 46 | Melanoma | L4–5 | Spondylectomy | L2, L3, S1, iliac, VBR | No | 18 | Unilateral rod breakage, pseudarthrosis | 2 Years 1 months |
| 20 | 65 | Multiple myeloma | S1 | Circumferential decompression | L4, L5, iliac | No | 11 | Bilateral rod breakage | 2 Years 4 months |
| 21 | 82 | Liposarcoma | L5 | Circumferential decompression | L2, L4, S1, iliac | No | 13 | Bilateral rod breakage | 2 Years 7 months |
| 22 | 45 | Aggressive hemangioma | L2 | Laminectomy | L1, L3 | No | 7 | Bilateral rod breakage | 3 Years 7 months |
| 23 | 57 | Hemangioblastoma | T4 | Spondylectomy | T2, T3, T5, T6, T7, T8, VBR | No | 19 | Bilateral rod breakage, mesh subsidence | 3 Years 8 months |
SMII, spinal metastasis invasiveness index; VBR, vertebral body replacement; UIV, upper instrumented vertebra; LIV, lower instrumented vertebra; PJF, proximal junctional failure; DJF, distal junctional failure.