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Effect of microseparation on contact mechanics in metal-on-metal hip replacements-A finite element analysis.

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FIGURE 1. Three dimensional co-ordinate measurement (mm) of the36-mm femoral head showing stripe wear due to microseparation andcontact between the head and the rim of the cup obtained from asimulator test
FIGURE 3. FE mesh generation and refinement: (a) the half cup model with refined mesh for the contact region as highlighted by the dashedline square, and the focused view for different mesh densities with the element sizes of (b) 0.25 mm, (c) 0.125 mm and (d
TABLE I. FE Mesh Convergence Check Based on the Cup of2-mm Rim Radius in 45� Inclination Under the Vertical Load-ing Force of 0.5 kN
FIGURE 7. Effect of cup rim radius, 0.5–4 mm, on the maximum con-tact pressure and the maximum equivalent plastic strain at the cuprim, for the cup in 45� of inclination with the head displacement at0.5 mm, under varying vertical loading forces between 0.5 and 3 kN.The resultant contact forces (5% larger than the corresponding verti-cal loading force for the 2-mm cup rim radius case) were chosen asthe variable for the horizontal axis to include a contribution from thehead displacement constraint along the medial-lateral direction.

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