Table 2.

Goodness of fit (R₂) for regression lines from plots of the E_ostechondral/E_chondral slope values as a function of listed parameters (mean values) including only regularly oriented 600, 900, and 1200 μm porous titanium bases (left) or including regularly oriented 600, 900, and 1200 μm porous titanium, randomly oriented 600 μm porous titanium, and porous tantalum (right). As the unit cell pore size for tantalum was not known, it was not included in this plot. Pore side length could not be measured for either randomly oriented structure, so no additional plots could be made for related parameters (marked “N/A”).

Parameter	R2
	Regular bases only	All bases
Unit cell pore size (μm)	0.89	0.83
Apparent density (g/cm3)	0.78	0.55
Metal volume fraction	0.71	0.53
Porosity	0.71	0.53
Pore side length (mm)	0.94	N/A
Pore cross-sectional area (mm2)	0.98	N/A
Pore area fraction	0.93	0.89