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. 2016:2016:6183679.
doi: 10.1155/2016/6183679. Epub 2016 Mar 14.

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

Jesica Anguiano-Sanchez  1 , Oscar Martinez-Romero  1 , Hector R Siller  1 , Jose A Diaz-Elizondo  2 , Eduardo Flores-Villalba  3 , Ciro A Rodriguez  1
Affiliations

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

Jesica Anguiano-Sanchez et al. Comput Math Methods Med. 2016.

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.

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Figures

Figure 1
Figure 1
(a) Three-dimensional model for the hip implant coated with PEEK, with proposed coating location indicated in red. (b) Cross section showing the proposed PEEK coating.
Figure 2
Figure 2
(a) FE model of femur with boundary conditions: 3,000 N in applied load at the femoral implant head and a fixation constraint at the distal end. (b) Top view of the model showing the hip implant, cortical and cancellous bone sections.
Figure 3
Figure 3
Effective von Mises stress [MPa] at cancellous bone for (a) proximal zone (lateral view), (b) mid zone (lateral view), and (c) tip zones (top view) (uncoated condition on left side and coated condition on the right side).
Figure 4
Figure 4
Effective von Mises stress [MPa] distribution at the cancellous bone for a curve along the surface: (a) proximal zone, (b) mid zone, and (c) tip zone (solid line: uncoated conditions, dotted lines: 100 μm, 200 μm, 300 μm, and 400 μm coatings).
Figure 5
Figure 5
Maximum principal stress (compressive stress) [MPa] distribution at the cancellous bone for a curve along the surface: (a) proximal zone, (b) mid zone, and (c) tip zone (solid line: uncoated conditions, dotted lines: 100 μm, 200 μm, 300 μm, and 400 μm coatings).
Figure 6
Figure 6
Effective von Mises stress [MPa] at cancellous bone for complete surface (uncoated condition on left side and 400 μm coating on the right side).
Figure 7
Figure 7
Change in stress transmission to the cancellous bone volume for different thickness of PEEK coatings (see Table 2).
Figure 8
Figure 8
Effective von Mises stress [MPa] for the complete model, using a 400 μm PEEK coating.
See this image and copyright information in PMC

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