Optimal Principle of Bone Structure
Figure 1
Positional relationship between a bone's COM and COS.
Fig. 1a Positional relationship between COM and COS on x-y plane; Fig. 1b Positional relationship between COM and COS on x-z plane; Fig. 1c Positional relationship between COM and COS on y-z plane; Fig. 1d Distance between bone's COM and COS. The bones' COS and COM are derived from the calculation of Eqs. (2) and (3). When choosing coordinate system with origin at COM, the coordinates of COS relative to COM can be derived as . By using
,
and
, 384 pieces' bone coordinates of COS with respect to COM can be located on x-y, y-z and x-z planes. See Fig. 1a, 1b and 1c (unit is mm). Through Eq. (4), the distance of these 384 pieces of bones' COS to the COM can be calculated, resulting in Fig. 1d.