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Research Papers

Influence of Implant Surface Texture Design on Peri-Acetabular Bone Ingrowth: A Mechanobiology Based Finite Element Analysis

[+] Author and Article Information
Kaushik Mukherjee

Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur, West Bengal 721 302, India

Sanjay Gupta

Professor
Department of Mechanical Engineering,
Indian Institute of Technology Kharagpur,
Kharagpur, West Bengal 721 302, India
e-mail: sangupta@mech.iitkgp.ernet.in

1Corresponding author.

Manuscript received June 10, 2016; final manuscript received November 18, 2016; published online January 23, 2017. Assoc. Editor: Kristen Billiar.

J Biomech Eng 139(3), 031006 (Jan 23, 2017) (8 pages) Paper No: BIO-16-1246; doi: 10.1115/1.4035369 History: Received June 10, 2016; Revised November 18, 2016

The fixation of uncemented acetabular components largely depends on the amount of bone ingrowth, which is influenced by the design of the implant surface texture. The objective of this numerical study is to evaluate the effect of these implant texture design factors on bone ingrowth around an acetabular component. The novelty of this study lies in comparative finite element (FE) analysis of 3D microscale models of the implant-bone interface, considering patient-specific mechanical environment, host bone material property and implant-bone relative displacement, in combination with sequential mechanoregulatory algorithm and design of experiment (DOE) based statistical framework. Results indicated that the bone ingrowth process was inhibited due to an increase in interbead spacing from 200 μm to 600 μm and bead diameter from 1000 μm to 1500 μm and a reduction in bead height from 900 μm to 600 μm. Bead height, a main effect, was found to have a predominant influence on bone ingrowth. Among the interaction effects, the combination of bead height and bead diameter was found to have a pronounced influence on bone ingrowth process. A combination of low interbead spacing (P = 200 μm), low bead diameter (D = 1000 μm), and high bead height (H = 900 μm) facilitated peri-acetabular bone ingrowth and an increase in average Young's modulus of newly formed tissue layer. Hence, such a surface texture design seemed to provide improved fixation of the acetabular component.

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Figures

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Fig. 1

Details of the microscale model of the implant-bone interface; (a) macroscale implanted pelvis model and microscale implant-bone interface model, (b) isometric view of beaded implant, (c) top view, and (d) zoomed view; H = bead height; D = bead diameter; P = interbead spacing

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Fig. 2

Specifications of the microscale models. H = bead height; D = bead diameter; P = interbead spacing.

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Fig. 3

Mechanoregulatory bone ingrowth simulation for the eight microscale models: distribution of peri-prosthetic newly formed tissues after ten iterations (days)

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Fig. 4

Mechanoregulatory bone ingrowth simulation for the eight microscale models: distribution of peri-prosthetic newly formed tissues after 20 iterations (days)

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Fig. 5

Mechanoregulatory bone ingrowth simulation for the eight microscale models: distribution of peri-prosthetic newly formed tissues after attainment of equilibrium in bone ingrowth

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Fig. 6

The progressive bone ingrowth in the eight microscale models

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