Table 2. Section properties of proximal femora (at 80% length[1 cm inferior to the lesser trochanter]) of two Paranthropus robustus specimens [37] and OH80.

Specimen	CA	MA	TA	%CA	IX	IY	J
SK 82	490	87	577	84.9	21.637	31.261	52.899
SK 97	457	135	593	77.1	21.228	33.779	55.007
OH 80-12*	524	87	611	85.7	26.234	32.458	58.691

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].