title: Prediction of damage formation in hip arthroplasties by finite element analysis using computed tomography images.
abstract: Femoral bone fracture is one of the main causes for the failure of hip arthroplasties (HA). Being subjected to abrupt and high impact forces in daily activities may lead to complex loading configuration such as bending and sideway falls. The objective of this study is to predict the risk of femoral bone fractures in total hip arthroplasty (THA) and resurfacing hip arthroplasty (RHA). A computed tomography (CT) based on finite element analysis was conducted to demonstrate damage formation in a three dimensional model of HAs. The inhomogeneous model of femoral bone was constructed from a 79 year old female patient with hip osteoarthritis complication. Two different femoral components were modeled with titanium alloy and cobalt chromium and inserted into the femoral bones to present THA and RHA models respectively. The analysis included six configurations, which exhibited various loading and boundary conditions, including axial compression, torsion, lateral bending, stance and two types of falling configurations. The applied hip loadings were normalized to body weight (BW) and accumulated from 1 BW to 3 BW. Predictions of damage formation in the femoral models were discussed as the resulting tensile failure as well as the compressive yielding and failure elements. The results indicate that loading directions can forecast the pattern and location of fractures at varying magnitudes of loading. Lateral bending configuration experienced the highest damage formation in both THA and RHA models. Femoral neck and trochanteric regions were in a common location in the RHA model in most configurations, while the predicted fracture locations in THA differed as per the Vancouver classification.
authors.affiliation: Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan; Faculty of Mechanical Engineering, Universiti Teknologi MARA, Shah Alam 40450, Malaysia.
authors.forename: Abdul Halim
authors.initials: AH
authors.lastname: Abdullah
authors.affiliation: Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan. Electronic address: todo@riam.kyushu-u.ac.jp.
authors.forename: Mitsugu
authors.initials: M
authors.lastname: Todo
authors.affiliation: Faculty of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
authors.forename: Yasuharu
authors.initials: Y
authors.lastname: Nakashima
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D015519:Bone Density; D005260:Female; D005264:Femoral Fractures / Q000000981:diagnostic imaging / Q000503:physiopathology; D020342:Finite Element Analysis; D006801:Humans; D055595:Mechanical Phenomena; D011475:Prosthesis Failure; D018570:Risk Assessment; D014057:Tomography, X-Ray Computed
keywords: CT-based finite element analysis; Damage formation; Femoral bone fractures; Resurfacing hip arthroplasty; Total hip arthroplasty