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The Journal of Bone and Joint Surgery, Vol 66, Issue 1 95-106, Copyright © 1984 by Journal of Bone and Joint Surgery, Inc
The composition of normal and osteoarthritic articular cartilage from human knee joints. With special reference to unicompartmental replacement and osteotomy of the knee
R Brocklehurst, MT Bayliss, A Maroudas, HL Coysh, MA Freeman, PA Revell and SY Ali
The articular cartilage from nineteen osteoarthritic and fourteen normal
control adult human knee joints was analyzed for changes in water content,
proteoglycan composition and structure, glycosaminoglycan synthesis rates,
and cell content. We found no significant differences between visually
intact cartilage from osteoarthritic knee joints and cartilage from control
joints for any of the parameters studied. In osteoarthritic specimens in
which the cartilage surface was not intact the biochemical changes depended
on the degree of fibrillation. Surface-fibrillated specimens had a higher
water content in the surface layers but no change in the content or
synthesis rate of glycosaminoglycan. Deeply fibrillated cartilage, however,
had an increased water content through its full depth, and there was a
decrease in both the rate of synthesis and the content of
glycosaminoglycans. Clinical Relevance: The results of this study suggest
that degenerative changes in osteoarthritic knees are focal in origin and
that corrective osteotomy or unicompartmental joint replacement might be
rational procedures for knees in which the cartilage in all of one
compartment is visually intact.

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