Biomedical Engineering Reference
In-Depth Information
Fig. 7.26
Obtained apparent densities distributions for combination of all load cases
Fig. 7.27 a Foot X-ray plate. b Calcaneus X-ray detail. c Calcaneus internal principal trabecular
structures. d Geometry and nodal discretization used in the analysis of the calcaneus bone.
Tendonal forces: Achilles tendon force (T1), plantar fascia fan-tendon force (T2) and calcaneus-
metatarsal tendon force (T3)[
2
]
which is directly loaded by the tibia bone. The cuboid bone articulates with the
calcaneus bone anterior side, the Achilles tendon is inserted into a roughened area
on the superior side and the plantar fascia fan-tendon is inserted on the bottom of
the calcaneus bone.
In Fig.
7.27
a it is possible to visualize a foot X-ray plate in which foot bones
are indicated. A closer look on the calcaneus bone, Fig.
7.27
b, permit to empiri-
cally determine the compressive and tensile lines indicated in Fig.
7.27
c. The foot
is a dynamic structure, the several foot bones suffer a constant shift of load cases.
Therefore the foot bones are forced to achieve an internal trabecular architecture
which permits to resist the several applied load cases. The compressive and tensile
