SINS SCORESpinal Instability Neoplastic Score

Calculated Score

Total SINS Score (Sum of 6 components)

Points

Scoring Components

Location (Junctional vs Semi-rigid)
Pain (Mechanical vs Non-mechanical)
Bone lesion (Lytic vs Blastic)
Spinal alignment (Subluxation/Kyphosis)
Vertebral body collapse
Posterior element involvement

Stability Tier

Stable

Clinical Strategy

Spinal stability is maintained. Mechanical intervention is typically not required; focus on systemic or radiation therapy.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Any patient with known spinal metastases or a suspicious vertebral lesion on imaging.

Used to decide if a patient needs an urgent surgical consultation for stabilization prior to, or in conjunction with, radiotherapy.

NOT used for primary bone tumors; specifically designed for metastatic involvement.

How it Works

The 6 Scoring Variables

Variable	Points
Location	0-3 (Junctional sites like C0-C2 or T12-L1 are highest risk)
Pain	0-3 (Mechanical pain that worsens with movement/loading)
Bone Lesion Quality	0-2 (Lytic lesions are higher risk than blastic)
Spinal Alignment	0-4 (Subluxation or kyphosis)
Vertebral Body Collapse	0-3 (Degree of height loss)
Posterolateral Involvement	0-3 (Involvement of facets, pedicles, or laminae)

Clinical Pearls

Actionable Interpretation

Total Score	Stability Status	Management
0 - 6	Stable	Radiotherapy / Systemic therapy. No urgent surgery needed.
7 - 10	Indeterminate	Potential instability. Surgical consultation strongly recommended.
11 - 18	Unstable	High risk of collapse/cord injury. Urgent surgical stabilization required.

The "Mechanical Pain" Pearl

Pain that is relieved by lying flat and worsened by sitting or standing is "mechanical" and highly suggestive of instability. This is distinct from "biological" cancer pain which is often dull, constant, and worse at night.

Last Comprehensive Review: 2026

SINS SCORESpinal Instability Neoplastic Score

Calculated Score

Total SINS Score (Sum of 6 components)

Points

Scoring Components

Location (Junctional vs Semi-rigid)
Pain (Mechanical vs Non-mechanical)
Bone lesion (Lytic vs Blastic)
Spinal alignment (Subluxation/Kyphosis)
Vertebral body collapse
Posterior element involvement

Stability Tier

Stable

Clinical Strategy

Spinal stability is maintained. Mechanical intervention is typically not required; focus on systemic or radiation therapy.

Guidelines & Evidence

Verified

Last Review: 2026

When to Use

Any patient with known spinal metastases or a suspicious vertebral lesion on imaging.

Used to decide if a patient needs an urgent surgical consultation for stabilization prior to, or in conjunction with, radiotherapy.

NOT used for primary bone tumors; specifically designed for metastatic involvement.

How it Works

The 6 Scoring Variables

Variable	Points
Location	0-3 (Junctional sites like C0-C2 or T12-L1 are highest risk)
Pain	0-3 (Mechanical pain that worsens with movement/loading)
Bone Lesion Quality	0-2 (Lytic lesions are higher risk than blastic)
Spinal Alignment	0-4 (Subluxation or kyphosis)
Vertebral Body Collapse	0-3 (Degree of height loss)
Posterolateral Involvement	0-3 (Involvement of facets, pedicles, or laminae)

Clinical Pearls

Actionable Interpretation

Total Score	Stability Status	Management
0 - 6	Stable	Radiotherapy / Systemic therapy. No urgent surgery needed.
7 - 10	Indeterminate	Potential instability. Surgical consultation strongly recommended.
11 - 18	Unstable	High risk of collapse/cord injury. Urgent surgical stabilization required.

The "Mechanical Pain" Pearl

Last Comprehensive Review: 2026

SINS Score

Calculated Score

Stable

When to Use

When to Use

How it Works

The 6 Scoring Variables

Clinical Pearls

Actionable Interpretation

The "Mechanical Pain" Pearl

The Evidence

Key Reference

A novel classification system for spinal stability in neoplasia: residency of the spinal oncology study group and the development of the spinal instability neoplastic score (SINS)

Recent Journal Updates

SINS Score

Calculated Score

Stable

When to Use

When to Use

How it Works

The 6 Scoring Variables

Clinical Pearls

Actionable Interpretation

The "Mechanical Pain" Pearl

The Evidence

Key Reference

A novel classification system for spinal stability in neoplasia: residency of the spinal oncology study group and the development of the spinal instability neoplastic score (SINS)

Recent Journal Updates