title: Fatigue creep damage at the cement-bone interface: an experimental and a micro-mechanical finite element study.
abstract: The goal of this study was to quantify the micromechanics of the cement-bone interface under tensile fatigue loading using finite element analysis (FEA) and to understand the underlying mechanisms that play a role in the fatigue behavior of this interface. Laboratory cement-bone specimens were subjected to a tensile fatigue load, while local displacements and crack growth on the specimen's surface were monitored. FEA models were created from these specimens based upon micro-computed tomography data. To accurately model interfacial gaps at the interface between the bone and cement, a custom-written erosion algorithm was applied to the bone model. A fatigue load was simulated in the FEA models while monitoring the local displacements and crack propagation. The results showed the FEA models were able to capture the general experimental creep damage behavior and creep stages of the interface. Consistent with the experiments, the majority of the deformation took place at the contact interface. Additionally, the FEA models predicted fatigue crack patterns similar to experimental findings. Experimental surface cracks correlated moderately with FEA surface cracks (r(2)=0.43), but did not correlate with the simulated crack volume fraction (r(2)=0.06). Although there was no relationship between experimental surface cracks and experimental creep damage displacement (r(2)=0.07), there was a strong relationship between the FEA crack volume fraction and the FEA creep damage displacement (r(2)=0.76). This study shows the additional value of FEA of the cement-bone interface relative to experimental studies and can therefore be used to optimize its mechanical properties.
authors.affiliation: Orthopaedic Research Laboratory, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. d.waanders@orthop.umcn.nl
authors.forename: Daan
authors.initials: D
authors.lastname: Waanders
authors.forename: Dennis
authors.initials: D
authors.lastname: Janssen
authors.forename: Mark A
authors.initials: MA
authors.lastname: Miller
authors.forename: Kenneth A
authors.initials: KA
authors.lastname: Mann
authors.forename: Nico
authors.initials: N
authors.lastname: Verdonschot
mesh_terms: D000268:Adhesiveness; D001843:Bone Cements / Q000737:chemistry*; D003198:Computer Simulation; D055119:Elastic Modulus; D005269:Femur / Q000737:chemistry*; D020342:Finite Element Analysis; D006244:Hardness; D006245:Hardness Tests; D008422:Materials Testing; D008956:Models, Chemical; D013499:Surface Properties; D013718:Tensile Strength; D014783:Viscosity
chemical_list: D001843:Bone Cements
references.citation: J Orthop Res. 2007 Jun;25(6):779-88
references.pmid: 17343282
references.citation: J Biomed Mater Res. 1995 May;29(5):575-81
references.pmid: 7622542
references.citation: J Biomech. 2004 Oct;37(10):1505-12
references.pmid: 15336925
references.citation: J Biomech. 1993 Apr-May;26(4-5):453-63
references.pmid: 8478349
references.citation: J Biomech. 1991;24(5):317-29
references.pmid: 2050708
references.citation: J Bone Joint Surg Br. 1991 Jul;73(4):551-8
references.pmid: 2071634
references.citation: J Orthop Res. 2009 Mar;27(3):340-6
references.pmid: 18846550
references.citation: J Biomech Eng. 2008 Apr;130(2):021019
references.pmid: 18412506
references.citation: J Biomed Mater Res B Appl Biomater. 2006 Feb;76(2):287-97
references.pmid: 16080159
references.citation: Bone. 2003 Oct;33(4):494-504
references.pmid: 14555252
references.citation: J Bone Joint Surg Br. 1994 Jan;76(1):49-52
references.pmid: 8300681
references.citation: J Biomech. 2003 Jun;36(6):861-71
references.pmid: 12742454
references.citation: J Orthop Res. 2008 Jun;26(6):872-9
references.pmid: 18253965
references.citation: J Arthroplasty. 1987;2(4):293-8
references.pmid: 3430156
references.citation: J Orthop Res. 2009 Oct;27(10):1312-8
references.pmid: 19340877
references.citation: J Orthop Res. 2004 May;22(3):633-40
references.pmid: 15099645
references.citation: Clin Orthop Relat Res. 2007 Mar;456:138-47
references.pmid: 17075379
references.citation: J Biomech. 2008 Nov 14;41(15):3158-63
references.pmid: 18848699
references.citation: J Biomech Eng. 2005 Apr;127(2):213-9
references.pmid: 15971698
references.citation: J Mater Sci Mater Med. 2008 May;19(5):1935-43
references.pmid: 17934799
references.citation: Acta Orthop Scand. 1993 Dec;64(6):699-716
references.pmid: 8291421
references.citation: J Biomech. 2003 Apr;36(4):489-96
references.pmid: 12600339
references.citation: Clin Orthop Relat Res. 1996 Aug;(329):326-36
references.pmid: 8769468
references.citation: J Biomech. 1997 Apr;30(4):339-46
references.pmid: 9075001