The elastic properties of the bone constituting human femurs have been determined from measurements of the velocities of ultrasonic compressional and shear waves through wet, embalmed bone samples. The bone has been shown to be a transversely isotropic material with the axis of symmetry parallel to the longitudinal axis of the bone. The values of the elastic constants were determined to be:  
c11=6860±330MPaE3=5500MPa
 
c12=2700±570MPaE1=4990MPa
 
c13=3760±1570MPaν31=0.39
 
c33=8480±760MPaν12=0.20
 
c44=2240±180MPaG31=2240MPa
where the 3-axis is that of rotational symmetry and the 1- and 2-axes are in the plane of isotropy.
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