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The Subaxial Cervical Spine Injury Classification System: an external agreement validation study
Joost J van Middendorp1, Laurent Audigé, Ronald H Bartels
1Stoke Mandeville Spinal Foundation, National Spinal Injuries Centre, Stoke Mandeville Hospital, Aylesbury, UK; Harris Manchester College, University of Oxford, Oxford, UK; Spine Unit, Department of Orthopaedics, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands.
The Subaxial Cervical Spine Injury Classification (SLIC) system showed poor agreement on injury characteristics and did not improve surgeon treatment decisions. Reproducibility may increase with clearer morphologic criteria for subaxial cervical spine injuries.
Area of Science:
- Orthopedic Surgery
- Neurosurgery
- Trauma Care
Background:
- The Subaxial Cervical Spine Injury Classification (SLIC) system was developed in 2007.
- Initial validation showed moderate reliability for the SLIC system.
Purpose of the Study:
- To evaluate the inter-rater agreement on the SLIC system using clinical data from spinal trauma patients.
- To determine if the SLIC treatment algorithm enhances agreement on treatment decisions among surgeons.
Main Methods:
- An external validation study involving 12 spinal surgeons (5 consultants, 7 fellows).
- Assessment of 51 randomly selected subaxial cervical spine injury cases.
- Reliability analysis using raw agreement, Fleiss kappa, and intraclass correlation coefficients.
Main Results:
- Strong inter-rater agreement was found for the most severe injury level (κ=0.76).
- Poor agreement was observed for morphologic injury characteristics (κ=0.29) and average agreement for discoligamentous complex integrity (κ=0.46).
- Inter-rater agreement on treatment verdicts (κ=0.55) was lower than surgeons' personal treatment preferences (κ=0.63).
Conclusions:
- The SLIC system demonstrated poor agreement on morphologic injury characteristics.
- The SLIC treatment algorithm did not improve treatment decision agreement among surgeons.
- Improved reproducibility may require more unambiguous morphologic injury criteria.
