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Research Papers

Combined Bone Ingrowth and Remodeling Around Uncemented Acetabular Component: A Multiscale Mechanobiology-Based Finite Element Analysis

[+] Author and Article Information
Kaushik Mukherjee

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

Sanjay Gupta

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

1Corresponding author.

Manuscript received January 11, 2017; final manuscript received June 16, 2017; published online July 26, 2017. Assoc. Editor: Thao (Vicky) Nguyen.

J Biomech Eng 139(9), 091007 (Jul 26, 2017) (12 pages) Paper No: BIO-17-1017; doi: 10.1115/1.4037223 History: Received January 11, 2017; Revised June 16, 2017

Bone ingrowth and remodeling are two different evolutionary processes which might occur simultaneously. Both these processes are influenced by local mechanical stimulus. However, a combined study on bone ingrowth and remodeling has rarely been performed. This study is aimed at understanding the relationship between bone ingrowth and adaptation and their combined influence on fixation of the acetabular component. Based on three-dimensional (3D) macroscale finite element (FE) model of implanted pelvis and microscale FE model of implant–bone interface, a multiscale framework has been developed. The numerical prediction of peri-acetabular bone adaptation was based on a strain-energy density-based formulation. Bone ingrowth in the microscale models was simulated using the mechanoregulatory algorithm. An increase in bone strains near the acetabular rim was observed in the implanted pelvis model, whereas the central part of the acetabulum was observed to be stress shielded. Consequently, progressive bone apposition near the acetabular rim and resorption near the central region were observed. Bone remodeling caused a gradual increase in the implant–bone relative displacements. Evolutionary bone ingrowth was observed around the entire acetabular component. Poor bone ingrowth of 3–5% was predicted around the centro-inferio and inferio-posterio-superio-peripheral regions owing to higher implant–bone relative displacements, whereas the anterio-inferior and centro-superior regions exhibited improved bone ingrowth of 35–55% due to moderate implant–bone relative displacement. For an uncemented acetabular CoCrMo component, bone ingrowth had hardly any effect on bone remodeling; however, bone remodeling had considerable influence on bone ingrowth.

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Figures

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Fig. 1

The multiscale framework: (a) the macroscale implanted pelvis model and microscale implant-bone interface model and (b) calculation of equivalent stiffness of the implant layer in the macroscale model

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Fig. 2

Computational scheme for combined bone ingrowth and remodeling simulation

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Fig. 3

The scheme for interpretation of results: (a) four regions of interests (ROI) for interpreting bone remodeling and implant–bone micromotion results and (b) 13 peri-acetabular regions for interpreting the evolutionary bone ingrowth results

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Fig. 4

Bone density distribution in the implanted acetabulum, lateral view, and sectional view: (a) immediate postoperative and (b) after equilibrium in combined simulation. The evolutionary bone resorption in the central (polar) acetabular region (encircled area) is presented graphically in the inset.

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Fig. 5

Implant–bone total relative displacement distribution in the implanted pelvis: (a) immediate postoperative period and (b) after equilibrium in combined simulation

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Fig. 6

Peri-acetabular bone ingrowth in the 13 regions after equilibrium in combined simulation: (a) amount of bone ingrowth percentage and (b) average tissue Young's modulus

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Fig. 7

Evolutionary bone ingrowth in different peri-acetabular regions

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Fig. 8

The distribution of the newly formed tissues in different peri-acetabular regions after equilibrium in combined simulation

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