1. Bryant Roberts Supervisors: Karen Reynolds, Egon Perilli

2. Background -Epidemiology of osteoporosis and fracture fixation -What are the complications? -Flinders University Research -How am I going to contribute? Methods -What is strain mapping? Why is it important? -What has been done previously? -How will I accomplish my task? Timeline -Develop strain mapping software for N specimens -How will I validate my software

3. Characterised by low bone mass and micro- architectural deterioration More common in elderly women Leading to enhanced bone fragility and a consequent increase in fracture risk 10% ↓ hip bone mass results in 2.5x greater risk of hip fracture (Klotzbuecher et al. 2000)

4. In Australia - Over 40 admissions to hospital daily - 16,518 incidences in 2006-07 Fracture sites - 96% neck of femur or intertrochanteric (Dixon & Crisp, 2010)

5. Most common surgical procedure - fixation of the fractured bone (metal plates or screws)

6.  Low bone density results in inadequate bone- screw interface  This can lend itself to loosening of the fixation device

7. Developing a computer-based model to increase understanding of failure mechanisms during screw insertion into trabecular bone.

8. FE models calculate strain as function of bone loading, architecture and assumed tissue material properties. Trabecular bone structure - in order of µm ∴ unfeasible to measure strain directly Aim Utilise strain mapping techniques currently reported within the literature.

9. Head Contact Failure

10.  Utilise software (ITK, MATLAB) to generate displacement and corresponding strain fields by application of methods defined in the literature.  If required, refine current programs for image registration

11. Questions?