Table 1. Components of Spinal Instability Neoplastic Score.
| Components of spinal instability neoplastic score | Score |
|---|---|
| Location | |
| Junctional (Occiput-C2, C7-T2, T11-L1, L5-S1) | 3 |
| Mobile spine (C3-6, L2-4) | 2 |
| Semi-rigid (T3-T10) | 1 |
| Rigid (S2-5) | 0 |
| Pain | |
| Yes | 3 |
| Occasional pain but not mechanical | 2 |
| Pain-free lesion | 0 |
| Bone lesion | |
| Lytic | 2 |
| Mixed (lytic/blastic) | 1 |
| Blastic | 0 |
| Spinal alignment | |
| Subluxation/translation present | 4 |
| De novo deformity (kyphosis/scoliosis) | 2 |
| Normal alignment | 0 |
| Vertebral body collapse | |
| > 50% collapse | 3 |
| < 50% collapse | 2 |
| No collapse with > 50% body involved | 1 |
| None of the above | 0 |
| Posterolateral involvement of the spinal elements | |
| Bilateral | 3 |
| Unilateral | 1 |
| None of the above | 0 |