Determination of replicate composite bone material properties using modal analysis.
Replicate composite bones are used extensively for in vitro testing of new orthopedic devices. Contrary to tests with cadaveric bone material, which inherently exhibits large variability, they offer a standardized alternative with limited variability. Accurate knowledge of the composite's material properties is important when interpreting in vitro test results and when using them in FE models of biomechanical constructs. The cortical bone analogue material properties of three different fourth-generation composite bone models were determined by updating FE bone models using experimental and numerical modal analyses results. The influence of the cortical bone analogue material model (isotropic or transversely isotropic) and the inter- and intra-specimen variability were assessed. Isotropic cortical bone analogue material models failed to represent the experimental behavior in a satisfactory way even after updating the elastic material constants. When transversely isotropic material models were used, the updating procedure resulted in a reduction of the longitudinal Young's modulus from 16.00GPa before updating to an average of 13.96 GPa after updating. The shear modulus was increased from 3.30GPa to an average value of 3.92GPa. The transverse Young's modulus was lowered from an initial value of 10.00GPa to 9.89GPa. Low inter- and intra-specimen variability was found.
KU Leuven, Department of Mechanical Engineering, Biomechanics Section, Celestijnlaan 300C - box 2419, 3000 Leuven, Belgium. Electronic address: steven.leuridan@kuleuven.be.
Steven
S
Leuridan
KU Leuven, Department of Mechanical Engineering, Biomechanics Section, Celestijnlaan 300C - box 2419, 3000 Leuven, Belgium; KU Leuven, Department of Mechanical Engineering Technology, Andreas Vesaliusstraat 13 - box 2600, 3000 Leuven, Belgium. Electronic address: quentin.goossens@kuleuven.be.
Quentin
Q
Goossens
KU Leuven, Department of Mechanical Engineering Technology, Andreas Vesaliusstraat 13 - box 2600, 3000 Leuven, Belgium. Electronic address: leonard.pastrav@kuleuven.be.
Leonard
L
Pastrav
University Hospitals Leuven, Department of Orthopedics, Weligerveld 1, 3212 Leuven, Belgium. Electronic address: jorg.roosen@gmail.com.
Jorg
J
Roosen
University Hospitals Leuven, Department of Orthopedics, Weligerveld 1, 3212 Leuven, Belgium. Electronic address: michiel.mulier@uzleuven.be.
Michiel
M
Mulier
KU Leuven, Department of Mechanical Engineering Technology, Andreas Vesaliusstraat 13 - box 2600, 3000 Leuven, Belgium. Electronic address: kathleen.denis@kuleuven.be.
Kathleen
K
Denis
KU Leuven, Department of Mechanical Engineering, Production Engineering, Machine Design and Automation Section, Celestijnlaan 300C - box 2420, 3000 Leuven, Belgium. Electronic address: wim.desmet@kuleuven.be.
Wim
W
Desmet
KU Leuven, Department of Mechanical Engineering, Biomechanics Section, Celestijnlaan 300C - box 2419, 3000 Leuven, Belgium. Electronic address: jos.vandersloten@kuleuven.be.
Jos Vander
JV
Sloten
D018786:Bone Substitutes; D000071538:Cortical Bone / Q000502:physiology*; D055119:Elastic Modulus; D006801:Humans; D008422:Materials Testing; D008962:Models, Theoretical
D018786:Bone Substitutes
Fourth-generation replicate composite bones; Material parameters updating; Modal analysis