title: Bone ingrowth around porous-coated acetabular implant: a three-dimensional finite element study using mechanoregulatory algorithm.
abstract: Fixation of uncemented implant is influenced by peri-prosthetic bone ingrowth, which is dependent on the mechanical environment of the implant-bone structure. The objective of the study is to gain an insight into the tissue differentiation around an acetabular component. A mapping framework has been developed to simulate appropriate mechanical environment in the three-dimensional microscale model, implement the mechanoregulatory tissue differentiation algorithm and subsequently assess spatial distribution of bone ingrowth around an acetabular component, quantitatively. The FE model of implanted pelvis subjected to eight static load cases during a normal walking cycle was first solved. Thereafter, a mapping algorithm has been employed to include the variations in implant-bone relative displacement and host bone material properties from the macroscale FE model of implanted pelvis to the microscale FE model of the beaded implant-bone interface. The evolutionary tissue differentiation was observed in each of the 13 microscale models corresponding to 13 acetabular regions. The total implant-bone relative displacements, averaged over each region of the acetabulum, were found to vary between 10 and 60 μm. Both the linear elastic and biphasic poroelastic models predicted similar mechanoregulatory peri-prosthetic tissue differentiation. Considerable variations in bone ingrowth (13-88%), interdigitation depth (0.2-0.82 mm) and average tissue Young's modulus (970-3430 MPa) were predicted around the acetabular cup. A progressive increase in the average Young's modulus, interdigitation depth and decrease in average radial strains of newly formed tissue layer were also observed. This scheme can be extended to investigate tissue differentiation for different surface texture designs on the implants.
authors.affiliation: Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, West Bengal, India.
authors.forename: Kaushik
authors.initials: K
authors.lastname: Mukherjee
authors.affiliation: Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, West Bengal, India. sangupta@mech.iitkgp.ernet.in.
authors.forename: Sanjay
authors.initials: S
authors.lastname: Gupta
mesh_terms: D000077:Acetabulum / Q000187:drug effects / Q000254:growth & development*; D000465:Algorithms; D001696:Biomechanical Phenomena / Q000187:drug effects; D020099:Coated Materials, Biocompatible / Q000494:pharmacology*; D020342:Finite Element Analysis; D005684:Gait / Q000502:physiology; D006621:Hip Joint / Q000187:drug effects / Q000502:physiology; D006801:Humans; D008875:Middle Aged; D008954:Models, Biological; D009132:Muscles / Q000187:drug effects / Q000502:physiology; D016062:Porosity; D019736:Prostheses and Implants
chemical_list: D020099:Coated Materials, Biocompatible
keywords: Biphasic poroelastic model; Linear elastic model; Mechanoregulatory algorithm; Tissue differentiation; Uncemented acetabular implant