The role of synovitis in osteoarthritis pathogenesis
Open accessAbstract
Research into the pathophysiology of osteoarthritis (OA) has focused on cartilage and peri-articular bone, but there is increasing recognition that OA affects all of the joint tissues, including the synovium (SM). Under normal physiological conditions the synovial lining consists of a thin layer of cells with phenotypic features of macrophages and fibroblasts. These cells and the underlying vascularized connective tissue stroma form a complex structure that is an important source of synovial fluid (SF) components that are essential for normal cartilage and joint function. The histological changes observed in the SM in OA generally include features indicative of an inflammatory "synovitis"; specifically they encompass a range of abnormalities, such as synovial lining hyperplasia, infiltration of macrophages and lymphocytes, neoangiogenesis and fibrosis. The pattern of synovial reaction varies with disease duration and associated metabolic and structural changes in other joint tissues. Imaging modalities including magnetic resonance (MRI) and ultrasound (US) have proved useful in detecting and quantifying synovial abnormalities, but individual studies have varied in their methods of evaluation. Despite these differences, most studies have concluded that the presence of synovitis in OA is associated with more severe pain and joint dysfunction. In addition, synovitis may be predictive of faster rates of cartilage loss in certain patient populations. Recent studies have provided insights into the pathogenic mechanisms underlying the development of synovitis in OA. Available evidence suggests that the inflammatory process involves engagement of Toll-like receptors and activation of the complement cascade by degradation products of extracellular matrices of cartilage and other joint tissues. The ensuing synovial reaction can lead to synthesis and release of a wide variety of cytokines and chemokines. Some of these inflammatory mediators are detected in joint tissues and SF in OA and have catabolic effects on chondrocytes. These inflammatory mediators represent potential targets for therapeutic interventions designed to reduce both symptoms and structural joint damage in OA. This article is part of a Special Issue entitled "Osteoarthritis".
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Inflammatory cytokines play pivotal roles in the pathogenesis of degenerative joint disease, orchestrating catabolic processes that lead to progressive cartilage degradation, synovial inflammation, and bone remodeling.
“Inflammatory cytokines play pivotal roles in the pathogenesis of degenerative joint disease, orchestrating catabolic processes that lead to progressive cartilage degradation, synovial inflammation, and bone remodeling [31,32,33].”
From Biomarker-Guided Imaging and AI-Augmented Diagnosis of Degenerative Joint Disease (2025) · cites this paper as [31]
The Soluble Inflammatory Mediators section describes cytokines and chemokines that may contribute to joint inflammation and cartilage matrix destruction, and its IL-1 subsection describes catabolic effects on chondrocytes. The Conclusion says these mediators may affect cartilage homeostasis and peri-articular bone remodeling; it does not establish that cytokines orchestrate a progressive causal sequence across all three outcomes. (LLM, conf=0.84)
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BackgroundOligosaccharides of Hyaluronan Activate Dendritic Cells via Toll-like Receptor 4
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- Authors
- Scanzello, C. R., & Goldring, S. R.
- Affiliations
- Rush University Medical Center (US)
- Hospital for Special Surgery (US)
- Corresponding author
- Scanzello, Carla R.
- ORCID
- Scanzello, Carla R.
- Venue
- Bone
- Publisher
- Elsevier BV
- Published
- 2012-08
- Volume
- 51
- Issue
- 2
- Pages
- 249-257
- ISSN
- 1873-2763 (ISSN-L)
- 8756-3282
- PMC
- PMC3372675
- OpenAlex
- W2085788584
- Cited by
- 1,302
- References
- 7
- Citations by year
- 2026: 116 · 2025: 136 · 2024: 119 · 2023: 109 · 2022: 89 · 2021: 110 · 2020: 105 · 2019: 95 · 2018: 86 · 2017: 84 · 2016: 68 · 2015: 74 · 2014: 68 · 2013: 36 · 2012: 6
- FWCI
- 8.82
- Type
- journal article
- Language
- en
- Open access
- green
- europepmc.org
- Locations
- Bone (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health (5k08ar057859-05)
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (K08-AR-057859, 1K08 AR057859-02)
- Topics
- Health Sciences › Medicine › Rheumatology › Osteoarthritis Treatment and Mechanisms
- Health Sciences › Medicine › Rheumatology › Rheumatoid Arthritis Research and Therapies
- Health Sciences › Medicine › Rheumatology › Musculoskeletal synovial abnormalities and treatments
- Keywords
- osteoarthritis, synovitis, synovium, synovial fluid, Toll-like receptors, complement system, cartilage degeneration, cytokines, chemokines, chondrocyte catabolism, synovial fibrosis, neoangiogenesis, joint pain
- MeSH terms
- Animals, Humans, Osteoarthritis, Synovial Membrane, Synovitis, Signal Transduction, Disease Progression, Inflammation Mediators
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