Chronic Non-Bacterial Osteitis Pathophysiology and Treatment
Summary
Chronic non-bacterial osteitis (CNO) is an autoinflammatory bone disorder characterised by sterile bone inflammation, pain and potential structural damage. The pathophysiology centres on dysregulated innate immunity, in which monocytes and osteoclast precursors display an imbalance between anti-inflammatory and pro-inflammatory cytokine production. Defective interleukin-10 and interleukin-19 expression is accompanied by overactivation of the NLRP3 inflammasome pathway, leading to excessive interleukin-1β and tumour necrosis factor-α release. Genetic variants in inflammatory signalling components, such as P2RX7 and FBLIM1, have been linked to disease susceptibility and severity. Clinically, CNO manifests as unifocal or multifocal bone lesions, with imaging by whole-body MRI or CT proving essential for diagnosis and monitoring. Initial management typically comprises nonsteroidal anti-inflammatory drugs or selective cyclooxygenase-2 inhibitors, with intravenous bisphosphonates and tumour necrosis factor-α inhibitors reserved for refractory disease. Emerging approaches under investigation include interleukin-1 antagonists and targeted small molecules aimed at modulating inflammasome assembly. Multidisciplinary expert consensus has refined diagnostic criteria, treatment algorithms and outcome measures, yet international registries and randomised trials remain critical to establish standardised care and improve long-term outcomes.
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Chronic Non-Bacterial Osteitis Pathophysiology and Treatment publication trend
The graph below shows the total number of articles in chronic non-bacterial osteitis pathophysiology and treatment across all publications each year (not limited to Nature Index journals).
Technical terms
Autoinflammatory: Innate immune dysregulation leading to sterile tissue inflammation without high-titre autoantibodies.
Cytokine: Small signalling protein secreted by immune cells that modulates inflammation and immune responses.
NLRP3 inflammasome: Multiprotein complex that activates caspase-1, promoting interleukin-1β maturation and release.
Bisphosphonates: Bone-resorption inhibitors that induce osteoclast apoptosis and reduce inflammatory bone lesions.
Tumour necrosis factor-α inhibitor: Biologic agent neutralising TNF-α to decrease inflammation in autoinflammatory and autoimmune disorders.
Whole-body MRI: Imaging modality that detects multifocal bone inflammation without ionising radiation.
References
- Expert consensus recommendations for the diagnosis and treatment of chronic non-bacterial osteitis (CNO) in adults. Annals of the Rheumatic Diseases (2025).
- The role of cytokines in the pathogenesis of SAPHO syndrome. Frontiers in Immunology (2024).
- An improved understanding of pediatric chronic nonbacterial osteomyelitis pathophysiology informs current and future treatment. Journal of Bone and Mineral Research (2024).
- Recessive coding and regulatory mutations in FBLIM1 underlie the pathogenesis of chronic recurrent multifocal osteomyelitis (CRMO). PLOS ONE (2017).
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