“…The biomechanical and tribological properties of articular cartilage has been investigated over the past 20 years in-vitro through pin-on-plate or sphere-on-disk (Lipshitz et BI., 1975;Zimmerman et BI., 1988;Forster et BI., 1995;Forster and Fisher, 1996;Pickard et BI., 1998a;Pickard et BI., 1998b;Forster and Fisher, 1999;Freeman et BI., 2000;Basalo et al, 2004; Krishnan McCann et al, 2009), in hip (Muller et al, 2004Demarteau et al, 2006), in modelling studies (Boschetti et al, 2004;Cilingir et al, 2008). and in-vivo studies (Cook et al, 1982;Cruess et al, 1984;McGibbon et al, 1999;van der Meulen et al, 2002;Kyoung Ho et al, 2008).…”