A modified method for assigning material properties to FE models of bones.
The aim of the present study is to compare the results from subject-specific finite element analysis (FEA) of a human femur to experimental measurements, using two different methods for assigning material properties to the FE models. A modified material mapping strategy allowing for spatial variation of material properties within the elements and Young's modulus surface corrections is presented and compared to a more conventional strategy, whereby constant material properties are assigned to each element. The accuracy of the superficial stress-strain predictions was evaluated against experimental results from 13 strain gauges and five different load cases. Both methods predicted stresses with acceptable accuracy (R(2) = 0.92, root mean square error, RMSE < 10%), with the conventional method performing slightly better. The modified method performed better in strain prediction (R(2) = 0.85, RMSE = 23% versus R(2) = 0.79, RMSE = 31%).
Helgason
Benedikt
B
University of Iceland, Department of Mechanical and Industrial Engineering, Iceland. benhel@hi.is
Taddei
Fulvia
F
Pálsson
Halldór
H
Schileo
Enrico
E
Cristofolini
Luca
L
Viceconti
Marco
M
Brynjólfsson
Sigurthur
S
D000818:Animals; D001331:Automation; D001842:Bone and Bones / Q000473:pathology*; D019245:Compressive Strength; D004867:Equipment Design; D005269:Femur / Q000473:pathology*; D020342:Finite Element Analysis; D006736:Horses; D006801:Humans; D008422:Materials Testing; D015233:Models, Statistical; D015203:Reproducibility of Results; D013314:Stress, Mechanical; D014057:Tomography, X-Ray Computed / Q000379:methods; D016474:Weight-Bearing