Influence of PEEK Coating on Hip Implant Stress Shielding: A Finite Element Analysis Page: 4
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Computational and Mathematical Methods in Medicine
PEEK coating A
PEEK coating A 1.926
- - 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).
number of nodes: proximal (6,811 nodes), mid (6,291 nodes),
and tip (3,277 nodes).
Figure 3 shows the Finite Element analysis results for
effective von Mises stresses in the proximal, mid, and
distal zones of the cancellous bone. The comparison of
uncoated versus coated conditions (400 ym) shows a signif-
icant increase in the transmitted stress to the femur. For the
coated condition, stress is almost uniformly distributed in all
lateral surfaces, except for a peak zone with a stress value of
In the mid zone (see Figure 3(b)), the difference in stress
distribution is more significant compared to the proximal and
tip zones. In the case of the tip zone analysis the increase in
stress distribution is moderate.
Figure 4 shows the stress values for a curve along each of
the zones proposed in this study. Each point represents a node
along the curve of analysis. The starting point with length
0 mm is always at the top of the selected zone.
Figure 4(a) shows the effective von Mises stress on a single
curve along the proximal zone. As the length increases, the
effect of the coating is more noticeable. It is clear that as the
coating thickens higher loads are transferred to the femur
and, consequently, less stress shielding will be presented. The
difference in stress transmission for a coating thickness of
400 ym versus 100 ym is only significant at a length between
35 and 50 mm. Therefore, for the purpose of producing
a workable electrophoresis coating, the thickness can be
maintained below 400 ym.
Figures 4(b) and 4(c) present the results for mid and tip
zone, respectively. The mid zone shows the best results in
terms of load transferred to cancellous bone. In Figure 4(b)
the behavior of stress distribution changes across the curve
length, comparing the uncoated and the coated condition.
After 60 mm all lines for each coating thickness almost
overlap. For the tip zone, Figure 4(c), values of effective von
Mises are higher here than in any other zone of the bone.
In this case, the curve of analysis goes around the tip of the
implant (see Figure 4(c)).
For comparison, Figure 5 shows the analysis based on
maximum principal stress. Similar to the analysis based on
effective von Mises stress, the coating shows better transmis-
sion of the load to the cancellous bone.
Figure 6 shows the complete surface analysis for the
cancellous bone. The results show a clear increase of stress in
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Anguiano-Sanchez, Jesica; Martínez-Romero, Oscar; Siller, Héctor R.; Díaz-Elizondo, José A.; Flores-Villalba, Eduardo & Rodríguez, Ciro A. Influence of PEEK Coating on Hip Implant Stress Shielding: A Finite Element Analysis, article, February 7, 2016; Cairo, Egypt. (https://digital.library.unt.edu/ark:/67531/metadc993394/m1/4/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT College of Engineering.