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].