Tensile testing of human cortical bone is conducted to obtain the elastic moduli. The cross-sectional geometry of bone varies along its length, although the cross-section can be approximated as hollow and circular, with an average outer diameter of 27 mm and inner diameter of 14 mm . Let the gage section over which the elongation is measured be 40 mm . A straight line is fit to the load-elongation data, giving a slope of 1.12 N/m .