Porosity-geometry interaction in the conservation of bone strength.
Automated image analysis of a small sample of femoral cross-section radiographs has revealed a consistent difference in bone porosity relative to geometry. Two sub-periosteal fields were assessed microscopically, with field location determined with reference to the principal moment axes (Imax, Imin). The data indicate that: (1) porosity is greatest in the direction of maximum geometric resistance to bending, along the Imin axis; and (2) porosity differences between the Imax and Imin fields decrease as the bone becomes more circular in cross-sectional shape.
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D000328:Adult; D000368:Aged; D001696:Biomechanical Phenomena; D001842:Bone and Bones / Q000503:physiopathology*; D005260:Female; D005269:Femur / Q000503:physiopathology; D006801:Humans; D008297:Male; D010024:Osteoporosis / Q000503:physiopathology*