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Structural clues to articular calcified cartilage function: A descriptive review of this crucial interface tissue

期刊

JOURNAL OF ANATOMY
卷 241, 期 4, 页码 875-895

出版社

WILEY
DOI: 10.1111/joa.13728

关键词

articular calcified cartilage; calcified cartilage chondrocytes; calcified cartilage matrix; cement line; osteoarthritis; tidemark

资金

  1. Anatomical Society [SSD 011018SEAL-v1-011217]

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Articular calcified cartilage (ACC) has been dismissed by some as a remnant of endochondral ossification, but recent research suggests that it may play a role in knee joint osteoarthritis (OA). ACC is less studied compared to other joint tissues, but its anatomical and metabolic features may be important and deserve further investigation.
Articular calcified cartilage (ACC) has been dismissed, by some, as a remnant of endochondral ossification without functional relevance to joint articulation or weight-bearing. Recent research indicates that morphologic and metabolic ACC features may be important, reflecting knee joint osteoarthritis (OA) predisposition. ACC is less investigated than neighbouring joint tissues, with its component chondrocytes and mineralised matrix often being either ignored or integrated into analyses of hyaline articular cartilage and subchondral bone tissue respectively. Anatomical variation in ACC is recognised between species, individuals and age groups, but the selective pressures underlying this variation are unknown. Consequently, optimal ACC biomechanical features are also unknown as are any potential locomotory roles. This review collates descriptions of ACC anatomy and biology in health and disease, with a view to revealing its structure/function relationship and highlighting potential future research avenues. Mouse models of healthy and OA joint ageing have shown disparities in ACC load-induced deformations at the knee joint. This raises the hypothesis that ACC response to locomotor forces over time may influence, or even underlie, the bony and hyaline cartilage symptoms characteristic of OA. To effectively investigate the ACC, greater resolution of joint imaging and merging of hierarchical scale data will be required. An appreciation of OA as a 'whole joint disease' is expanding, as is the possibility that the ACC may be a key player in healthy ageing and in the transition to OA joint pathology.

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