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Clinical calculator summary

SINS (Spinal Instability)

The Spinal Instability Neoplastic Score (SINS) assesses spinal stability in patients with neoplastic disease.

Evidence-based context for fast calculator use

Purpose:
SINS quantifies spinal instability from metastatic tumors using six clinical and radiographic factors to guide surgical consultation decisions.
Population:
patients undergoing skeletal metastasis stability, fracture-risk, survival, or operative assessment
Factors:
Location, Pain Relief with Recumbency, Bone Lesion Quality, Radiographic Spinal Alignment, Vertebral Body Collapse, Posterolateral Involvement
Reference:
Fisher CG, DiPaola CP, Ryken TC, et al. A novel classification system for spinal instability in neoplastic disease: an evidence-based approach and expert consensus from the Spine Oncology Study Group. Spine (Phila Pa 1976). 2010;35(22):E1221-E1229.
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SINS (Spinal Instability)

Clinical Context & Background

The Spinal Instability Neoplastic Score (SINS) assesses spinal stability in patients with neoplastic disease. It guides referrals to spine surgeons. A score ≥ 13 indicates instability requiring surgical consultation, while 7-12 is indeterminate.
Primary Source EvidenceFisher CG, DiPaola CP, Ryken TC, et al. A novel classification system for spinal instability in neoplastic disease: an evidence-based approach and expert consensus from the Spine Oncology Study Group. Spine (Phila Pa 1976). 2010;35(22):E1221-E1229.
Formula Logic
Sum of 6 radiographic and clinical factors.

Reference Data

SINS ScoreClassificationRecommendation
0 - 6StableRadiation / Observation
7 - 12Indeterminate (Impending)Surgical Consultation
13 - 18UnstableSurgical Stabilization Required

Clinical Workflow

Use, Interpret, And Continue The Patient Pathway

Expand for workflow guidance, limitations, examples, and related next steps.

When To Use

  • Use SINS (Spinal Instability) when sINS quantifies spinal instability from metastatic tumors using six clinical and radiographic factors to guide surgical consultation decisions.
  • Confirm that the patient, diagnosis, disease phase, and available inputs match the cited model before calculation.

How To Interpret

  • Interpret the displayed result using the calculator-specific formula and reference table, spanning 0 - 6 through 13 - 18.
  • A boundary result should prompt input verification and clinical review rather than false precision.

What To Do Next

  • Combine the score with neurologic examination, mechanical pain, imaging, oncologic prognosis, radiosensitivity, surgical options, and patient goals.
  • Document the inputs, result, timing, and clinical context so the assessment can be reproduced.

Limitations

  • Fracture, spinal-instability, survival, and surgical-selection scores measure different domains and cannot substitute for urgent specialist assessment.
  • The result supports clinician judgment and does not independently determine treatment.

Validated Population

patients undergoing skeletal metastasis stability, fracture-risk, survival, or operative assessment

How to apply this result

For a representative case, verify Location, Pain Relief with Recumbency, Bone Lesion Quality, calculate the result, and confirm that its classification matches the highlighted reference band before continuing the disease-specific pathway.

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Frequently Asked Questions

When should SINS (Spinal Instability) be used?

Use it for patients undergoing skeletal metastasis stability, fracture-risk, survival, or operative assessment when all required inputs and the intended clinical setting are confirmed.

Can SINS (Spinal Instability) determine treatment by itself?

No. Interpret the result with the cited evidence, complete clinical assessment, current guidelines, and patient-specific goals.

Evidence-based oncology decision support. Verify with clinical guidelines.