Several modern total hip arthroplasty (THA) implants have been associated with increased release of metallic debris through combined mechanical fretting wear and chemical corrosion. This debris can lead to painful adverse reaction to metallic debris, often requiring early revision [1]. While much research has focused on improving the performance of bearing surfaces, the key parameters driving release of metallic debris at modular junctions remains unclear. Stochastic finite element (FE) simulation was used to evaluate the influence of design changes and loading severity on the mechanics of THA head-neck (trunnion-taper) junctions. Several modeling challenges were overcome in meeting this goal. The stochastic approach revealed critical parameters controlling the mechanical predictors of fretting.

A parametric FE model of an isolated THA trunnion-taper junction was created (ANSYS Inc. Canonsburg, PA) and geometrically defined by seven parameters (Fig. 1). This was solved for 400 stochastic permutations...

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