Journal
FRONTIERS IN PHYSIOLOGY
Volume 14, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fphys.2023.1182902
Keywords
spondyloarthropathy; enthesitis; ankylosing spondylitis; immunometabolism; structural progression; sacroiliac joint; MRI; sacroiliitis
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A detailed anatomical description of the sacroiliac joint is crucial for understanding spondyloarthropathy, as sacroiliitis is its earliest and most common sign. Additionally, understanding the histopathology and immunological mechanisms of sacroiliac entheses is essential for comprehending the disease causation. This review focuses on the anatomical, histological, and immunohistological observations related to the development of sacroiliitis and discusses the sequencing of enthesitis, synovitis, and subchondral bone changes in spondyloarthropathy.
For a better understanding of the pathophysiology of spondyloarthropathy (SpA), a detailed anatomical description of the sacroiliac joint is required because sacroiliitis is the earliest and most common sign of SpA and an essential feature for the diagnosis of ankylosing spondylitis. Beyond the anatomy, the histopathology of sacroiliac entheses and immunological mechanisms involved in sacroiliitis are crucial for a better understanding of disease causation. In this narrative review, we discuss the core anatomical, histological, and immunohistological observations involved in the development of sacroiliitis, focusing particularly on imaging-based information associated with sacroiliitis. Finally, we try to answer the question of whether at the sacroiliac joint, enthesitis precedes synovitis and subchondral bone changes in SpA.
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