Contact mechanics studies of an ellipsoidal contact bearing surface of metal-on-metal hip prostheses under micro-lateralization

Prediction of contact mechanics in metal-on-metal Total Hip Replacement for parametrically comprehensive designs and loads

“…7). Present results and previous work (Al-Hajjar et al, 2013;Currier et al, 2013;Elkins et al, 2012;Mak et al, 2011;Sariali et al, 2012;Wang et al, 2014) indicate that transitional-polar contact causes elevated pressures without the need for subluxation. Therefore transitional-polar contact may be both more severe than normal-polar and more frequently occurring than edge-contact and hence may represent the greatest wear challenge.…”

“…Previous researchers have observed individual contact categories including normal-polar (Besong et al, 2001;Cosmi et al, 2006;Jagatia and Jin, 2002;Liu et al, 2003Liu et al, , 2008Mak et al, 2011;Meng et al, 2010;Sariali et al, 2012;Udofia et al, 2004;Wang et al, 2014;Yew et al, 2003), ring-polar (Besong et al, 2001;Cosmi et al, 2006;Jagatia and Jin, 2002;Liu et al, 2003Liu et al, , 2004Meng et al, 2010;Udofia et al, 2004;Yew et al, 2003), asymmetric-polar (Besong et al, 2001), transitional-polar (Elkins et al, 2012;Mak et al, 2011;Sariali et al, 2012;Wang et al, 2014), transitional-edge (Elkins et al, 2012;Sariali et al, 2012) and normal-edge (Elkins et al, 2012;Sariali et al, 2012;Wang et al, 2014). The present study included all categories and facilitated a comprehensive understanding of their multi-factorial causes .…”

“…Most previous analyses have focused on polar loading (Besong et al, 2001;Bevill et al, 2005;Cosmi et al, 2006;Fialho et al, 2007;Jagatia and Jin, 2002;Liu et al, 2011Liu et al, , 2003Liu et al, , 2008Maxian et al, 1996;Meng et al, 2010;Udofia et al, 2004;Yew et al, 2003), with some recent attention to edge loading (Elkins et al, 2012(Elkins et al, , 2013Mak et al, 2011;Sariali et al, 2012;Wang et al, 2014); the latter associated with subluxation, head-on-rim contact, and extreme wear in explant analyses (Al-Hajjar et al, 2013;Currier et al, 2013). However, continuous solutions for contact mechanics and permanent deformation throughout transition from polar through near-edge to edge loading have not been reported.…”

Study of the Polycarbonate-Urethane/Metal Contact in Different Positions during Gait Cycle

“…All the aforementioned values are very close to those obtained in healthy hip model simulations. However, the latter are much lower than values obtained with other bearing surfaces: ceramic-on-ceramic 40–250 MPa [61], metal-on-metal 200 MPa [62], metal-on-ceramic 40–112 MPa [63], and polyethylene-on-metal 22 MPa [63]. Contact pressure values are important because they modify the tribologic behavior of the implant and the wear rate over the time.…”

Tribocorrosion of hard-on-hard total hip replacements with metal and ceramic counterfaces under standard and adverse loading conditions

“…Contact pressures as a result of a smaller 0.25 mm of microseparation have been estimated through modelling to be as high as 972 MPa for a 28 mm MoM bearing and 672 MPa for MoC [33,34]. The tribological contact is also likely to be very different, moving from Standard Gait sliding with sub-100…”