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Developing a method for determining strain in trabecular
bone for validation of an FE model
Bryant RobertsSupervisors: Karen Reynolds, Egon Perilli
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
Presentation Outline
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)
Osteoporosis
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)
Osteoporotic Hip Fracture
Most common surgical procedure- fixation of the fractured bone (metal
plates or screws)
Osteoporotic Hip Fracture
Low bone density results in inadequate bone-screw interface
This can lend itself to loosening of the fixation device
Implant Complications
Developing a computer-based model to increase understanding of failure mechanisms during screw insertion into trabecular bone.
Flinders University Research
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
AimUtilise strain mapping techniques currently reported within the literature.
Validating strain in FE models
Strain MappingHead Contact
Failure
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
Proposal
Thank youQuestions?