title: Multi-axial loading micromechanics of the cement-bone interface in postmortem retrievals and lab-prepared specimens.
abstract: Maintaining adequate fixation between cement and bone is important for successful long term survival of cemented total joint replacements. Mixed-mode loading conditions (combination of tension/compression and shear) are present during in vivo loading, but the micromotion response of the interface to these conditions is not fully understood. Non-destructive, multi-axial loading experiments were conducted on laboratory prepared (n=6) and postmortem (n=6) human cement-bone interfaces. Specimens were mounted in custom loading discs and loaded at 0°, 30°, 60°, and 90° relative to the interface plane where 0° represents normal loading to the interface, and 90° represents shear loading along the longitudinal axis of the femur. Axial compliance did not depend on loading angle for laboratory prepared (p=0.96) or postmortem specimens (p=0.62). The cement-bone interface was more compliant under tensile than compressive loading at the 0° loading angle only (p=0.024). The coupled transverse to axial compliance ratio, which is a measure of the coupled motion, was small for laboratory prepared (0.115 ± 0.115) and postmortem specimens (0.142 ± 0.101). There was a moderately strong inverse relationship between interface compliance and contact index (r(2)=0.65). From a computational modeling perspective, the results of the current study support the concept that the cement-bone interface could be numerically implemented as a compliant layer with the same initial stiffness in tension and shear directions. The magnitude of the compliance could be modified to simulate immediate post-operative conditions (using laboratory prepared data set) or long-term remodeling (using postmortem data set).
authors.affiliation: SUNY Upstate Medical University, Syracuse, NY, USA.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Miller
authors.forename: Amos
authors.initials: A
authors.lastname: Race
authors.forename: Daan
authors.initials: D
authors.lastname: Waanders
authors.forename: Richard
authors.initials: R
authors.lastname: Cleary
authors.forename: Dennis
authors.initials: D
authors.lastname: Janssen
authors.forename: Nico
authors.initials: N
authors.lastname: Verdonschot
authors.forename: Kenneth A
authors.initials: KA
authors.lastname: Mann
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001843:Bone Cements; D001842:Bone and Bones / Q000000981:diagnostic imaging / Q000502:physiology*; D003187:Compliance; D005260:Female; D006801:Humans; D007753:Laboratories; D008297:Male; D055595:Mechanical Phenomena; D009038:Motion; D013048:Specimen Handling / Q000379:methods*; D016474:Weight-Bearing; D055114:X-Ray Microtomography
chemical_list: D001843:Bone Cements