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. 2006 Feb;128(1):131-4.
doi: 10.1115/1.2133764.

Frictional response of bovine articular cartilage under creep loading following proteoglycan digestion with chondroitinase ABC

Ines M Basalo  1 , Faye Hui Chen, Clark T Hung, Gerard A Ateshian
Affiliations

Frictional response of bovine articular cartilage under creep loading following proteoglycan digestion with chondroitinase ABC

Ines M Basalo et al. J Biomech Eng. 2006 Feb.

Abstract

The specific aim of this study was to investigate the effect of chondroitinase ABC treatment on the frictional response of bovine articular cartilage against glass, under creep loading. The hypothesis is that chondroitinase ABC treatment increases the friction coefficient of bovine articular cartilage under creep. Articular cartilage samples (n = 12) harvested from two bovine knee joints (1-3 months old) were divided into a control group (intact specimens) and a treated group (chondroitinase ABC digestion), and tested in unconfined compression with simultaneous continuous sliding (+/- 4 mm at 1 mm/s) under a constant applied stress of 0.5 MPa, for 2500 s. The time-dependent response of the friction coefficient was measured. With increasing duration of loading, treated samples exhibited a significantly higher friction coefficient than control samples as assessed by the equilibrium value (treated: micro(eq) = 0.19 +/- 0.02; control: micro(eq) = 0.12 +/- 0.03; p = 0.002), though the coefficient achieved immediately upon loading did not increase significantly (treated: micro(min) = 0.0053 +/- 0.0025; control: micro(min) = 0.037 +/- 0.0013; p = 0.19). Our results demonstrate that removal of the cartilage glycosaminoglycans using chondroitinase ABC significantly increases the overall time-dependent friction coefficient of articular cartilage. These findings strengthen the motivation for developing chondroprotective strategies by increasing cartilage chondroitin sulfate content in osteoarthritic joints.

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Figures

Figure 1
Figure 1
Average and standard deviation of the time-dependent friction coefficient μeff for the chondroitinase treated (solid line) and control (dotted line) groups (n=6 per group).
Figure 2
Figure 2
Average and standard deviation of the response of the creep strain for the chondroitinase treated and control groups (n=6 per group).
Figure 3
Figure 3
Average friction coefficient obtained under a stress-relaxation testing configuration (10% compressive strain after an application of a tare load of 1.8 ± 0.4 N), from the study of Basalo et al. [9].
See this image and copyright information in PMC

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