Research project on the hip bone transplant. Making pores in the transplant allows the blood to flow within which allows cell scaffolding. Matching the load taken by the bone to that of titanium allows equal balance of forces to the adjoining bone which also reduces the stress o the other bones

1. HIP BONE PROSTHESES
QUT VRES PROJECT
Manav Shah

2. {
Hip Bone Prostheses
Stress shielding Bone Resorption
Cell Scaffolding
Finite Element Analysis
(FEA)
Problems
Solution

3. Research Procedure
This research is focused on developing a 3D finite element model of
functionally graded femoral prostheses to decrease stress shielding and to
improve total hip replacement performance. In order to promote cell
scaffolding, CAD models were designed of 5*5*5 truncated octahedron having
different pore size. The models having different pore size was arranged
differently in a specific pattern so that it can be analysed and conclusions can be
drawn out of it. Strain energy, total deformation and von Mises stresses were
determined in all the models.

4. Different types of cell scaffolding

5. Comparative of material properties of
hip joint bone and Titanium
Young's
Modulus (GPa)
Poisson’s Ratio Strength
(MPa)
Hip joint bone 16.7 0.3 157
Titanium 110.3 0.32 1401

6. Gradient Design Model
Material
poresize
Loading conditions
Design selection Arrangement
Results

7. Design of pores of different sizes in
3D CAD modelling
Structure of 0.75µm pore Structure of 1µm pore Structure of 1.25µm pore

8. Stress analysis on the models in
ANSYS Workbench
Applying 1100N of force on one side
resembling the human body movements
Applying mesh to detect
deformation

9. Measuring the elastic strain on the
model

10. Measuring the Von-Mises stress on the
model

11. Measuring the total deformation on the
model

12. Making the 5*5 model having pore size
of 0.75µm on the outside, 1µm in the
middle and 1.25µm in the centre
Model 1

13. Making the 5*5 model having pore size
of 1.25µm on the outside, 1µm in the
middle and 0.75µm in the centre
Model 2

14. Total deformation of model 1 and
model 2
Model 1
Model 2

15. Results

16. model 1mm 0.75mm 1.25mm
Minimum
deformation
0 0 0
Maximum
deformation
0.00017015 0.0001747 0.00013985
Minimum elastic
strain (Pa)
05.0943e-5 3.3477e-5 6.398ee-5
Maximum elastic
strain (Pa)
0.027498 0.016548 0.064794
Minimum Von-mises
stress(Pa)
4.8906e6 1.3349e7 6.1348e6
Maximum von-
mises(Pa)
2.6389e9 1.5598e9 5.9284e8

17. model 1 2
Minimum
deformation
0 0
Maximum
deformation
4.6456e-5 9.5058e-5
Minimum elastic
strain (Pa)
1.9481e-7 7.0625e-8
Maximum elastic
strain (Pa)
0.0064117 0.011706
Minimum Von-mises
stress(Pa)
1.4904 6.780
Maximum von-
mises(Pa)
6.0496e8 9.9982e8

18. Thank you for your time