Table 3. Cross-sectional properties of femoral 50% sections of OH80 and KNM-ER 1808 (Homo erectus).
Specimen | CA | MA | TA | %CA | IX | IY | J |
OH 80-12* | 492 | 35 | 526 | 93.5 | 21.763 | 22.161 | 43.924 |
KNMER 1808 | 478 | 73 | 551 | 86.8 | 20.813 | 27.251 | 48.064 |
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 taken directly on the proximal break of the shaft at the mid-section.