Table 2.

Closest isotropic equivalents for transversely isotropic stiffness coefficients as defined by the minimum Riemann distance between stiffness matrices [32]

	Tissue parameters			Lamé parameters		Stiffness and modulus
	ϕ	λi	Et	λ	μ	C11 a	E1 b
Healthy	0.15	(1.0, 0.67, 0.67)	1.0	0.0102	0.00626	0.0227	0.0164
Osteopenic	0.08	(1.0, 0.5, 0.5)	1.0	0.00148	0.00091	0.0033	0.00238

^a C₁₁ = 2μ + λ.

^b $E_1=\frac{\mu (3\lambda +2\mu )}{\lambda +\mu }.$