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SINS Score and Stability: Evaluating the Need for Stabilization Within the Uncertain Category
Zach Pennington1, A Karim Ahmed1, Erick M Westbroek1
1Department of Neurosurgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
World Neurosurgery
|May 20, 2019
Summary
For metastatic spine disease, a Spinal Instability Neoplastic Score (SINS) of 9 or less suggests lesions may not need stabilization. A SINS score of 10 or higher indicates a higher likelihood of requiring stabilization surgery.
Area of Science:
- Oncology
- Orthopedic Surgery
- Radiology
Background:
- Metastatic spine disease presents a significant challenge in oncology and orthopedic surgery.
- The Spinal Instability Neoplastic Score (SINS) is a key tool for evaluating mechanical instability in these cases.
- Current guidelines lack a definitive cutoff for stabilization within the 'potentially unstable' SINS category.
Purpose of the Study:
- To identify a specific Spinal Instability Neoplastic Score (SINS) cutoff.
- To determine the threshold above which metastatic spine lesions are more likely to require surgical stabilization.
- To refine decision-making for surgical intervention in spinal metastases.
Main Methods:
- Retrospective review of 51 neurologically intact patients with metastatic spine disease over one year.
- Analysis of 436 tumor-involved vertebral levels, including preoperative imaging.
- Evaluation of factors such as SINS, revised Tokuhashi grade, and Karnofsky Performance Status (KPS).
Main Results:
- A Spinal Instability Neoplastic Score (SINS) of 10 or greater was associated with a >50% probability of lesion stabilization.
- Only 11% of patients with a SINS of 9 or less underwent instrumented fusion.
- SINS and Karnofsky Performance Status were independent predictors of stabilization (OR 2.44 and 1.10, respectively).
Conclusions:
- The decision to stabilize metastatic spine lesions depends on radiographic properties and patient clinical status.
- Lesions with a Spinal Instability Neoplastic Score (SINS) of 9 or less may not necessitate stabilization.
- This finding aids in optimizing treatment strategies for spinal metastases.
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