Section properties of proximal femora (at 80% length[1 cm inferior to the lesser trochanter]) of two Paranthropus robustus specimens [37] and OH80.

CA, cortical area; MA, medullary area; TA, total periosteal area; %CA, [(CA/TA) · 100); Ix, second moment of area about X (ML) axis (AP bending rigidity); Iy, second moment of area about y (AP) axis (ML bending rigidity); J, polar second moment of area. Areas in mm2, second moments of area in mm4.*Measurements from the proximal shaft were obtained near the top of the preserved section, slightly at the same undertrochanteric section as suggested by Ruff et al. [37].CA：皮质区（cortical area）；MA：髓质区（medullary area）；TA：骨膜总面积（total periosteal area）；%CA：[(CA/TA)×100]；Ix：绕X（内外侧（ML））轴的截面二次矩（前后向抗弯刚度）；Iy：绕Y（前后向（AP））轴的截面二次矩（内外侧抗弯刚度）；J：极截面二次矩。面积单位为平方毫米（mm²），截面二次矩单位为四次方毫米（mm⁴）。* 本研究的测量样本取自近端骨干保留标本的顶端区域，与Ruff等人[37]所建议的转子下区段位置基本一致。