Kinetics of Extraction of Proteoglycans from Human Cartilage

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Abstract
Fifty‐one uniformly sliced human patellar cartilage specimens were extracted with physiologic buffer containing inhibitors. Galactosamine‐rich proteoglycans were more easily extracted than glucosamine‐rich proteoglycans. Extraction occurred in 2 phases. There was a large proteoglycan extraction during the first 30 minutes, followed by a steady loss proportional to the square root of time. The amount of proteoglycans extracted during phase 1 was approximately half that of phase 2. Extraction of proteoglycans varied with age, structural integrity, and cartilage thickness. Intact osteoarthritic cartilage had normal proteoglycan extraction.