| Component scores for clinical and radiographic findings | Score | |
| Spine location | ||
| Junctional (occiput-C2, C7-T2, T11-L1, L5-S1) | 3 | |
| Mobile spine (C3-C6, L2-L4) | 2 | |
| Semi-rigid (T3-T10) | 1 | |
| Rigid (S2-S5) | 0 | |
| Pain relief with recumbence (lying down) or pain with movement/loading of the spine | ||
| Yes | 3 | |
| No (occasional pain but not mechanical) | 1 | |
| Pain-free lesion | 0 | |
| Bone lesion quality | ||
| Lytic | 2 | |
| Mixed lytic/blastic | 1 | |
| Blastic | 0 | |
| Radiographic 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 spinal elements (facet, pedicle, or costovertebral joint fracture or replacement with tumor) | ||
| Bilateral | 3 | |
| Unilateral | 1 | |
| None of the above | 0 | |
| The SINS score is generated by adding all of the scores from the six individual components (minimal score is 0, maximal score is 18) | ||
| Score | Classification | Action |
| 0 to 6 | Stable spine | |
| 7 to 12 | Indeterminant | Possible impending instability, warrants surgical consultation |
| 13 to 18 | Instability | Warrants surgical consultation |
