Biomedical Engineering Reference
In-Depth Information
Fig. 11
Safety factor for loads acting on the head of right proximal femur of male patients at 28
Table 1
Percentage variation in each model for different loading at constant angle of 28
Model 1(17-year
male) (%)
Model 2 (32-year
male) (%)
Model 3 (40-year
male) (%)
Total deformation
6.6708
6.6716
6.6674
Equivalent Von-Mises
stress
6.6702
6.6707
6.6687
Maximum Principal
stress
6.6697
6.6707
6.6684
Discussion and Conclusion
Patient-specific bone FE models generated from CT data have become of interest
because of their high potential in clinical practice. Although automatic mesh
generators may provide good and fast geometrical representation of bones, the
determination of their cortical/trabecular sub-domains and associated material
properties is still one of the major difficulties in making these FE models reliable
enough for clinical applications. Moreover, relatively fewer experimental and
computational studies have evaluated the intact whole femur's overall stiffness,
strength, cyclic loading, and high-energy impact loading under various loading
regimes, such as axial compression, lateral bending, and torsional loading, which
simulate either normal activity of daily living or injury mechanisms. The devel-
opment of subject-specific finite element (FE) models using computed tomography
(CT) data is a powerful tool to noninvasively investigate clinical applications, such
as fracture risk, prosthesis design, and bone remodeling. On applying half of the
body weight on the head of the right proximal femur of 17-, 32-, and 40-year male
patients 3D models under study at constant inclination angle, the following con-
clusion is drawn:
1. Total deformation increases with increase in body weight.
2. Equivalent Von-Mises stress and maximum principal stress increases with
increase in body weight.
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