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Validation of the EULAR/ACR classification criteria for chronic nonbacterial osteomyelitis in a pediatric cohort
Dilara Unal1, Yasemin Demir Yigit2, Ozge Basaran1
1Department of Pediatric Rheumatology, Hacettepe University, Ankara, Turkey.
Insights
The EULAR/ACR criteria accurately classify pediatric chronic nonbacterial osteomyelitis (CNO), a rare bone disorder. Validation in a diverse cohort confirms their high sensitivity and specificity for identifying homogeneous patient groups.
Area of Science:
- Pediatric Rheumatology
- Autoinflammatory Diseases
- Clinical Classification
Background:
- Chronic nonbacterial osteomyelitis (CNO) is a rare autoinflammatory bone disorder affecting children and adolescents.
- Accurate classification is crucial for research and management.
- International consensus developed the EULAR/ACR Classification Criteria for CNO.
Purpose of the Study:
- To validate the EULAR/ACR Classification Criteria in a diverse pediatric cohort.
- To compare the performance of EULAR/ACR criteria against existing Jansson and Roderick diagnostic criteria.
Main Methods:
- Retrospective evaluation of 78 pediatric CNO patients and 99 mimickers (2020-2024).
- Analysis of demographic, clinical, laboratory, and imaging data.
- Assessment of sensitivity, specificity, and predictive values of EULAR/ACR criteria, with statistical comparison to Jansson and Roderick criteria.
Main Results:
- EULAR/ACR criteria showed high accuracy: 92.68% sensitivity and 97.89% specificity.
- Outperformed Jansson criteria (88.46% sensitivity, 72.73% specificity) and matched Roderick criteria (96.15% sensitivity, 96.97% specificity).
- Key discriminators included multifocal/symmetric lesions, specific anatomical sites (clavicle, mandible), and absence of exclusion criteria.
Conclusions:
- Validated EULAR/ACR criteria demonstrate high specificity and good sensitivity for pediatric CNO.
- Facilitates identification of homogeneous patient populations for research and standardized management.
- Supports utility for consistent patient classification and research in pediatric CNO.
Objectives:
Chronic nonbacterial osteomyelitis (CNO) is a rare autoinflammatory bone disorder primarily affecting children and adolescents. An international consensus group developed the EULAR/ACR Classification Criteria in order to define a homogeneous group of patients diagnosed with CNO. This study aims to validate these criteria in a diverse pediatric cohort and compare their performance with the Jansson and Roderick diagnostic criteria.
Methods:
A retrospective evaluation was conducted on 78 pediatric CNO patients and 99 mimickers in Hacettepe University department of pediatric Rheumatology from 2020 to 2024. Demographic, clinical, laboratory, and imaging data were analyzed, and the sensitivity, specificity, and predictive values of the EULAR/ACR criteria were assessed. Statistical comparisons were made against the Jansson and Roderick criteria.
Results:
The EULAR/ACR criteria demonstrated high accuracy, with a sensitivity of 92.68% and specificity of 97.89%, outperforming the Jansson criteria (sensitivity: 88.46%, specificity: 72.73%) and aligning closely with the Roderick criteria (sensitivity: 96.15%, specificity: 96.97%). Key distinguishing features included multifocal and symmetric lesions, frequent involvement of high-scoring anatomical sites (e.g., clavicle and mandible), and the absence of exclusion criteria such as fever and markedly elevated inflammatory markers.
Conclusions:
The newly validated EULAR/ACR classification criteria for pediatric CNO demonstrated high specificity and good sensitivity in our cohort. Their application facilitates the identification of homogeneous patient populations, aiding in research consistency and the development of standardized approaches to CNO classification and management. Key Points • The EULAR/ACR classification criteria for pediatric CNO exhibited high specificity (97.89%) and sensitivity (92.68%), supporting their validity. • Multifocal and symmetric bone lesions, particularly in the clavicle and mandible, strongly support classification under these criteria. • Validation in a pediatric cohort reinforces their utility for standardized patient classification and research consistency.
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