title: A convenient approach for finite-element-analyses of orthopaedic implants in bone contact: modeling and experimental validation.
abstract: With regard to the growing potential of finite-element-analysis (FEA) in the field of orthopaedic biomechanics, we present an approach helping in the development of appropriate models of the implant-bone compound. The algorithm is based on computed-tomography data of the bone and accordant computer-aided-design (CAD) data of the implant and aims at predicting the bone strains and interface mechanics of the included parts. The developed algorithm was validated exemplary using an acetabular cup in combination with a left and a right fresh-frozen human hemipelvis. The strains under maximum loads during the gait cycle as well as the micromotion in the bone-implant interface were measured and compared to results from equivalent finite-element-analyses. Thereby, we found strong correlation between the calculated and measured principal strains with correlation coefficients of r(2)=0.94 (left side) and r(2)=0.86 (right side). A validation of micromotion was not possible due to limited accuracy of the motion tracking system.
authors.affiliation: Department of Orthopaedics, University of Rostock, Rostock, Germany. daniel.kluess@med.uni-rostock.de
authors.forename: Daniel
authors.initials: D
authors.lastname: Kluess
authors.forename: Robert
authors.initials: R
authors.lastname: Souffrant
authors.forename: Wolfram
authors.initials: W
authors.lastname: Mittelmeier
authors.forename: Andreas
authors.initials: A
authors.lastname: Wree
authors.forename: Klaus-Peter
authors.initials: KP
authors.lastname: Schmitz
authors.forename: Rainer
authors.initials: R
authors.lastname: Bader
mesh_terms: D000465:Algorithms; D001696:Biomechanical Phenomena; D001842:Bone and Bones / Q000473:pathology*; D019295:Computational Biology / Q000379:methods; D020342:Finite Element Analysis; D005684:Gait; D006801:Humans; D008962:Models, Theoretical; D009038:Motion; D009984:Orthopedic Fixation Devices; D019637:Orthopedic Procedures / Q000295:instrumentation*; D010388:Pelvis / Q000473:pathology; D012984:Software; D013314:Stress, Mechanical; D014057:Tomography, X-Ray Computed / Q000379:methods