Effects of sustained interstitial fluid pressurization under migrating contact area, and boundary lubrication by synovial fluid, on cartilage friction

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Presentation transcript:

Effects of sustained interstitial fluid pressurization under migrating contact area, and boundary lubrication by synovial fluid, on cartilage friction M. Caligaris, M.S., G.A. Ateshian, Ph.D. Osteoarthritis and Cartilage Volume 16, Issue 10, Pages 1220-1227 (October 2008) DOI: 10.1016/j.joca.2008.02.020 Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 (a) MCA – femoral condyle against tibial plateau; (b) MCA – convex glass against tibial plateau; (c) SCA – femoral condyle against flat glass; (d) SCA – cartilage plug against flat glass. Osteoarthritis and Cartilage 2008 16, 1220-1227DOI: (10.1016/j.joca.2008.02.020) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Schematic detailing the components of the contact force in the load cell's x–z frame, and in a normal–tangential frame to the contact interface. Osteoarthritis and Cartilage 2008 16, 1220-1227DOI: (10.1016/j.joca.2008.02.020) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Time-dependent response of the effective friction coefficient, μeff, averaged over all specimens, in experiment E1, which compares the outcome of MCAs vs SCAs. All three testing configurations are shown. Standard deviations are reported in Table II. Osteoarthritis and Cartilage 2008 16, 1220-1227DOI: (10.1016/j.joca.2008.02.020) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 Time-dependent response of the effective friction coefficient, normalized by its equilibrium value, μeff/μeq, in PBS vs SF, averaged over all specimens in experiment E3 which examines boundary lubrication by SF. Osteoarthritis and Cartilage 2008 16, 1220-1227DOI: (10.1016/j.joca.2008.02.020) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 Steady-state friction coefficient under MCA, μMCA, as a function of the Peclet number, in experiment E4 which examines the effect of sliding velocity. Significant differences are represented by distinct letters (P<0.0001). Osteoarthritis and Cartilage 2008 16, 1220-1227DOI: (10.1016/j.joca.2008.02.020) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 Steady-state friction coefficient under MCA, μMCA, for condyle (∼18mm radius of curvature) against tibia, or glass lenses (13 and 6.5mm radii of curvature) against tibia, in experiment E5 which examines the effect of congruence. No significant differences were observed among the three cases (P=0.24). Osteoarthritis and Cartilage 2008 16, 1220-1227DOI: (10.1016/j.joca.2008.02.020) Copyright © 2008 Osteoarthritis Research Society International Terms and Conditions