Management of Malignant Spinal Cord Lesions

Introduction to SINS Classification System

The Spinal Instability Neoplastic Score is an 18-point system that combines six clinical and radiographic parameters to stratify patients into three distinct management pathways, as recommended by the American College of Radiology 1, 2

Location, pain character, bone quality, spinal alignment, vertebral body collapse, and posterolateral involvement are the six parameters used in the SINS scoring system, with higher scores indicating greater instability, according to the American College of Radiology 1, 2

Patients with SINS scores of 0-6 are considered stable and can proceed directly to radiotherapy, while those with scores of 7-12 require individualized multidisciplinary assessment, and scores of 13-18 are considered unstable and require urgent surgical consultation, as recommended by the National Comprehensive Cancer Network 1, 2, 3
The Dutch National Guideline advises against using SINS as a predictor for progressive spinal instability due to lack of prospective validation, but acknowledges SINS remains valuable as a communication tool between specialties and for facilitating surgical consultation decisions 2

Surgery is the preferred treatment for mechanical spinal instability causing pain or neurological compromise, provided life expectancy exceeds 3 months and clinical condition permits, according to the American College of Surgeons 3
The Dutch National Guideline addresses surgical approach through evidence-based analysis, recommending that the decision be based on tumor location, extent of vertebral body involvement, and surgeon expertise rather than a universal preference 4, 5

Radiotherapy alone is the most common treatment for metastatic epidural spinal cord compression, and the Dutch National Guideline addresses radiotherapy technique through GRADE evidence-based analysis, recommending that the decision be based on tumor radiosensitivity, proximity to spinal cord, prior radiation history, and institutional expertise 4, 5
Fractionated radiotherapy should be administered after surgical stabilization to prevent prosthesis failure and reduce need for subsequent surgery, as recommended by the American College of Radiology 1

The algorithm involves immediate assessment, risk stratification, prognosis assessment, treatment selection, and adjunctive treatments, with the goal of providing individualized care for patients with malignant spinal cord lesions, according to the National Comprehensive Cancer Network 1, 2, 3, 4, 5

Patients with SINS scores of 0-6 can undergo standard physical therapy without restrictions, while those with scores of 7-12 require individualized assessment with modified activity restrictions, and scores of 13 or higher require no physical therapy until surgical stabilization is completed, as recommended by the American College of Sports Medicine 1, 2
Post-operative rehabilitation should be integrated into the aftercare trajectory, with involvement of a rehabilitation specialist, according to the American College of Rehabilitation Medicine 4, 5