Biomedical Engineering – From Theory to Applications

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Biomedical Engineering – From Theory to Applications
The mesh structure is presented in Fig. 5a. The bone is considered leaned on its metaphyseal
area. The geometrical model was subjected to a solicitation equal to a force of 1000N, in two
cases, like in Fig. 5a, and Fig.6a.
In Fig.5b and Fig.5c the stresses diagram for first loading case were obtained. In Fig.6 are
presented the stress diagrams for the second loading case. We can see that the maximum
values of stresses appear in the articular portion of the proximal ulna. They may involve the
olecranon process or the coronoid process. This area is the most solicited part of the bone
which is more likely to be involved in fractures.
a) b) c)
Fig. 6. The loading forces (a) and the obtained stress maps (b and c) for the second loading
case
Tibia. In the first case the tibia bone was subjected to a torsion couple on the top surface
(Fig.7a.). The bone is supported on its inferior base. We obtained the resultant stress
distribution for the torsion solicitation for the entire bone (Fig.7b). and for a section made in
this bone (Fig.7c). In the second case the bone was supposed to the bending by a normal
force equal with 180N distributed on the middle of tibia bone. The bone is leaned in his both
heads. We obtained the resultant stress distribution for the bending solicitation (Fig.8a.). In
third case the bone was supposed to a compression force distributed on the both superiors
condils (Fig.8b.). Finally, we obtained the resultant stress distribution for the compression
solicitation (Fig.8c.).
Fig. 7. The torsion solicitation (a) and the stress diagram obtained for the entire bone (b) and
for a section of the bone (c)