Cm. Fenech et Tm. Keaveny, A cellular solid criterion for predicting the axial-shear failure properties of bovine trabecular bone, J BIOMECH E, 121(4), 1999, pp. 414-422
Citations number
46
Categorie Soggetti
Multidisciplinary
Journal title
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME
In a long-term effort to develop a complete multi-axial failure criterion f
or human trabecular bone, the overall goal of this study was to compare the
ability of a simple cellular solid mechanistic criterion versus the Tsai-W
u, Principal Strain, and von Mises phenomenological criteria-all normalized
to minimize effects of interspecimen heterogeneity of strength-to predict
the on-axis axial-shear failure properties of bovine trabecular bone. The C
ellular Solid criterion that was developed here assumed that vertical trabe
culae failed due to a linear superposition of axial compression/tension and
bending stresses, induced by the apparent level axial and shear loading, r
espectively. Twenty-seven bovine tibial trabecular bone specimens were dest
ructively tested on-axis without end artifacts, loaded either in combined t
ension-torsion (n = 10), compression-torsion (n = 11), or uniaxially (n = 6
). For compression-shear, the mean (+/- S.D.) percentage errors between mea
sured values and criterion predictions were 7.7 +/- 12.6 percent, 19.7 +/-
23.2 percent, 22.8 +/- 18.9 percent, and 82.4 +/- 64.5 percent for the Cell
ular Solid. Tsai-Wu, Principal Strain, and von Mises criteria, respectively
; corresponding mean errors for tension-shear were -5.2 +/- 11.8 percent, 1
4.3 +/- 12.5 percent, 6.9 +/- 7.6 percent, and 57.7 +/- 46.3 percent. Stati
stical analysis indicated that the Cellular Solid criterion was the best pe
rformer for compression-shear, and performed as well as the Principal Strai
n criterion for tension-sheer. These data should substantially improve the
ability to predict axial-shear failure of dense trabecular bone. More impor
tantly the results firmly establish the importance of cellular solid analys
is for understanding and predicting the multiaxial failure behavior of trab
ecular bone.