Permeability of human medial collateral ligament in compression transverse to the collagen fiber direction

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• 作者：Jeffrey A. Weiss and Benjamin J. Maakestad
• 刊名：Journal of Biomechanics
• 出版年：2006
• 出版时间：2006
• 年：2006
• 卷：39
• 期：2
• 页码：276-283
• 全文大小：301 K

文摘

This study quantified the apparent and intrinsic hydraulic permeability of human medial collateral ligament (MCL) under direct permeation transverse to the collagen fiber direction. A custom permeation device was built to apply flow across cylindrical samples of ligament while monitoring the resulting pressure gradient. MCLs from 5 unpaired human knees were used (donor age , 4 males, 1 female). Permeability measurements were performed at 3 levels of compressive pre-strain (10 % , 20 % and 30 % ) and 5 pressures (0.17, 0.34, 1.03, 1.72 and 2.76 MPa). Apparent permeability was determined from Darcy's law, while intrinsic permeability was determined from the zero-pressure crossing of the pressure–permeability curves at each compressive pre-strain. Resulting data were fit to a finite deformation constitutive law [Journal of Biomechanics 23 (1990) 1145–1156]. The apparent permeability of human MCL ranged from 0.40±0.05 to depending on pre-strain and pressure gradient. There was a significant decrease in apparent permeability with increasing compressive pre-strain (p=0.024) and pressure gradient (p<0.001), and there was a significant interaction between the effects of compressive pre-strain and pressure (p<0.001). Intrinsic permeability was 14.14±0.74, 6.30±2.13 and for compressive pre-strains of 10 % , 20 % and 30 % , respectively. The intrinsic permeability showed a faster decrease with increasing compressive pre-strain than that of bovine articular cartilage. These data provide a baseline for investigating the effects of disease and chemical modification on the permeability of ligament and the data should also be useful for modeling the poroelastic material behavior of ligaments.