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Related Experiment Video

Updated: Sep 3, 2025

Precision Measurements and Parametric Models of Vertebral Endplates

Precision Measurements and Parametric Models of Vertebral Endplates

Published on: September 17, 2019

Classification system for cervical spine deformity morphology: a validation study.

Philip K Louie^1,2, Basel Sheikh Alshabab¹, Michael H McCarthy^1,3

¹1Department of Orthopaedic Surgery, Hospital for Special Surgery, New York, New York.

Journal of Neurosurgery. Spine

|July 28, 2022

Summary

This study validated a cervical spine deformity classification system, finding moderate to substantial agreement among physicians. The classification

Keywords:

cervical spine deformity cervicothoracic classification system coronal flat neck focal deformity

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Area of Science:

Orthopedics
Spine Surgery
Radiology

Background:

Cervical spine deformity (CD) presents complex challenges in diagnosis and treatment.
Accurate morphological classification is crucial for effective management of CD.
A recent classification system requires initial validation to assess its reliability and accuracy.

Purpose of the Study:

To initially validate a novel morphological classification system for cervical spine deformity pathology.
To assess the inter- and intrarater reliability of the proposed CD classification.
To determine the accuracy of the classification system across different physician experience levels.

Main Methods:

Retrospective review of 112 patients with cervical deformity from a multicenter database.
Categorization of patients into 4 deformity groups by 15 physicians with varying training levels.
Statistical analysis using Fleiss kappa coefficient for interrater reliability and accuracy assessment.

Main Results:

Moderate to substantial interrater agreement was observed (Fleiss kappa = 0.563–0.612).
Intrarater reliability was substantial (mean score = 0.686).
Overall accuracy was 73.5%, increasing to 86.0% when considering the main drivers of deformity.

Conclusions:

The validated morphological classification system for cervical spine deformity demonstrates good reliability.
The classification's accuracy is not significantly affected by rater experience, suggesting its simplicity.
Dynamic plain radiographs are essential for evaluating patients with cervical spine deformity.