Table 7. Eigenvectors of Principal Components 1–4.

	PC1	PC2	PC3	PC4
Body mass	0.239	−0.205	−0.026	0.318
Cross-sectional area	0.316	0.161	−0.025	0.227
Perimeter	0.358	−0.125	−0.147	0.040
Inner minor axis	0.234	−0.111	−0.296	−0.474
Inner major axis	0.289	−0.242	−0.116	−0.077
Outer minor axis	0.302	0.107	−0.230	−0.375
Outer major axis	0.350	−0.153	−0.112	0.171
Shape factor	0.194	−0.282	0.053	0.538
CSMI	0.358	0.081	−0.143	−0.122
Post-yield deflection	0.183	−0.125	0.518	−0.203
Total deflection	0.189	−0.147	0.507	−0.186
Stiffness	0.083	0.409	0.036	0.074
Yield load	0.123	0.407	0.028	0.071
Max load	0.136	0.468	0.035	0.027
Energy	0.209	0.063	0.506	−0.116
Femoral BMD	0.209	0.362	0.051	0.202

CSMI, cross-sectional moment of inertia; BMD, bone mineral density.