Influence of PEEK Coating on Hip Implant Stress Shielding: A Finite Element Analysis

Abstract

Stress shielding is a well-known failure factor in hip implants. This work proposes a design concept for hip implants, using a combination of metallic stem with a polymer coating (polyether ether ketone (PEEK)). The proposed design concept is simulated using titanium alloy stems and PEEK coatings with thicknesses varying from 100 to 400 μm. The Finite Element analysis of the cancellous bone surrounding the implant shows promising results. The effective von Mises stress increases between 81 and 92% for the complete volume of cancellous bone. When focusing on the proximal zone of the implant, the increased stress transmission to the cancellous bone reaches between 47 and 60%. This increment in load transferred to the bone can influence mineral bone loss due to stress shielding, minimizing such effect, and thus prolonging implant lifespan.

Does the prosthesis weight matter? 3D finite element analysis of a fixed implant-supported prosthesis at different weights and implant numbers

“…21 The mechanical properties of the materials and structures are summarized in Table 1. [22][23][24][25][26][27][28][29][30][31][32][33][34] The standard earth gravity direction for this study was defined along the Z-axis (negative direction) of the coordinate system with 9.8065 m/s 2 of acceleration. A restriction only occurred on the bone for the Z-axis, allowing lateral strain of the peri-implant bone.…”

CAD-FEA modeling and analysis of different full crown monolithic restorations

“…The materials and structures properties were attributed to each solid component with isotropic, homogeneous and linearly elastic behavior. Young's modulus and Poisson's ratio were reported (Table 1) [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] and all contacts were ideally cast.…”

Surface Characterization of Electro-Assisted Titanium Implants: A Multi-Technique Approach

“…Conversely, under stress, the bone density may reduce for adapting to the new under-stress situation (osteopenia) [109]. In order to avoid the mismatch between native bone and implant, recently, several studies have focused on a combination of the metallic implants with polymeric coatings, which shows important enhancements to reduce the stress shielding effect [110][111][112]. Therefore, understanding the resultant mechanical properties of the polymeric-coated implants may allow the prediction of the implant's in vivo response.…”