Page 230 - Advances in Biomechanics and Tissue Regeneration

226 11. ANALYSIS OF THE BIOMECHANICAL BEHAVIOR OF INTRAMEDULLARY NAILING

FIG. 11.17 Cross-section of the femur joint, intramedullary nail, and screws.

TABLE 11.1 Mesh Statistics of the Finite Element Models

Part of model Element type Number of elements
Femoral bone 4-node linear tetrahedron 427,939
Cortical bone 4-node linear tetrahedron 216,169
Trabecular bone 4-node linear tetrahedron 211,770
Intramedullary nail 4-node linear tetrahedron 574,547
Screw #1 4-node linear tetrahedron 2417
Screw #2 4-node linear tetrahedron 1454
Screw #3 4-node linear tetrahedron 1111
Screw #4 4-node linear tetrahedron 2818
Total 1,007,869

TABLE 11.2 Material Properties
Elastic isotropic Young’s modulus (MPa) Poisson coefficient
a
Cortical bone [41] 20,000 0.3
a
Trabecular bone [41] 959 0.12
316 LVM steel b 192,360 0.3
Ti-6L-4V b 113,760 0.34

a
Values supplied by the manufacturer.
b
Value corresponding to the maximum bone density. Elemental values were assigned according to the explained algorithm.

I. BIOMECHANICS