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. 2021 Jun 6;12(2):38.
doi: 10.3390/jfb12020038.

The Effect of Bottom Profile Dimples on the Femoral Head on Wear in Metal-on-Metal Total Hip Arthroplasty

J Jamari  1 , Muhammad Imam Ammarullah  1 , Amir Putra Md Saad  2   3 , Ardiyansyah Syahrom  2   3 , Mohammad Uddin  4 , Emile van der Heide  5 , Hasan Basri  6
Affiliations

The Effect of Bottom Profile Dimples on the Femoral Head on Wear in Metal-on-Metal Total Hip Arthroplasty

J Jamari et al. J Funct Biomater. .

Abstract

Wear and wear-induced debris is a significant factor in causing failure in implants. Reducing contact pressure by using a textured surface between the femoral head and acetabular cup is crucial to improving the implant's life. This study presented the effect of surface texturing as dimples on the wear evolution of total hip arthroplasty. It was implemented by developing finite element analysis from the prediction model without dimples and with bottom profile dimples of flat, drill, and ball types. Simulations were carried out by performing 3D physiological loading of the hip joint under normal walking conditions. A geometry update was initiated based on the patient's daily routine activities. Our results showed that the addition of dimples reduced contact pressure and wear. The bottom profile dimples of the ball type had the best ability to reduce wear relative to the other types, reducing cumulative linear wear by 24.3% and cumulative volumetric wear by 31% compared to no dimples. The findings demonstrated that surface texturing with appropriate dimple bottom geometry on a bearing surface is able to extend the lifetime of hip implants.

Keywords: bottom profile; contact pressure; dimple; total hip arthroplasty; wear.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Finite element contact model of the femoral head and acetabular cup.
Figure 2
Figure 2
Meshing on the dimple area.
Figure 3
Figure 3
Gait cycle under normal walking conditions [11].
Figure 4
Figure 4
Contact pressure validation after 2 × 106 cycles for the hip model without dimples.
Figure 5
Figure 5
Contact pressure on acetabular cup surface at the initial cycle.
Figure 6
Figure 6
Distribution of the contact pressure on the acetabular cup surface in specific phases at the initial cycle.
Figure 7
Figure 7
Wear validation for the hip model without dimples.
Figure 8
Figure 8
Cumulative wear on the acetabular cup surface.
Figure 9
Figure 9
Distribution of the contact pressure on the acetabular cup surface in the 7th phase at the initial cycle and after 2 × 106 cycles.
See this image and copyright information in PMC

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