The British Journal of Rheumatology, Vol 36, 16-19, Copyright © 1997 by British Society for Rheumatology
JP Mansell, JF Tarlton and AJ Bailey
Osteoarthritis (OA) of the hip is invariably viewed as a disease primarily
affecting the articular cartilage. Data presented in this report, however,
demonstrate changes in the metabolic activity of the underlying trabecular
bone tissue, the processes of which may represent a significant factor in
the pathogenesis of hip OA. Trabecular bone tissue from OA subjects
expressed significantly more matrix metalloproteinase (MMP)-2 (gelatinase
A, 72 kDa type IV collagenase) when compared to age-matched osteoporotic
(OP) and normal bone tissue. Alkaline phosphatase was also significantly
elevated in OA bone tissue. The combination of increased MMP-2 and alkaline
phosphatase indicates heightened collagen turnover in the subchondral bone
compartment of osteoarthritic hips. The data obtained from this study
warrant a closer investigation into the significance of these changes in OA
and emphasize the multifactorial elements of the whole joint in the whole
joint in the overall disease process.
ORIGINAL PAPERS
Biochemical evidence for altered subchondral bone collagen metabolism in osteoarthritis of the hip
Division of Molecular & Cellular Biology, University of Bristol.
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