Table 2.

Correlations (coefficients of determination, R²) of Bone volume fraction (BVF), Trabecular thickness (Tb.Th), Surface-Curve (S/C) ratio and Erosion Index (EI) between whole tibial cross section and 5 tibial sub-regions (8 × 8 × 5 mm³).

Sub-region	BVF	Tb.Th	S/C	EI
Anterior	0.57†	0.72†	0.77*	0.94**
Center	0.70†	0.58†	0.95**	0.99**
Medial	0.67†	0.70†	0.72†	0.92**
Lateral	0.65†	0.92**	0.64†	0.93**
Posterior	0.72†	0.79*	0.73†	0.95**

The R² values are for means from 3 image sets (baseline, follow-up1 and follow-up2) in five test subjects

^*, p<0.05;

^**p<0.01;

^†not significant.