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Fig. 2. Frequency diagram of the values of the ratio K of the internal to
external diameter of all investigated human femora from posterior (left
diagram) and medial (right diagram) views. The Gaussian curves are fitted to
the measured K-values. A vertical arrow shows the mean
Kmean. Vertical lines represent the four theoretical
optima KY, KS, KF,
KI given in Table
1. There are fewer K-values for medial than for posterior
view, because we could not evaluate the medial radiograph of a few subadult
and old-people femora with osteoporosis (in the contrast-poor radiographs the
bone walls could be recognized neither computationally, nor visually).