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Osteoporosis constitutes a world-wide health problem that affects mechanically integrity of
bones structure leading to unexpected fractures, mainly in the spine. A common clinical
procedure to treat these fractures is vertebroplasty, where a cement material is injected
trough a biopsy needle into the damaged vertebra.
Mechanical characteristics of bone cement can be obtained with a difficult and expensive
experimental process. The ultrasounds technique is one of the methods used to determine
these properties. Nevertheless, the measurements realization requires expensive materials
Finite element analysis can characterize materials from a theoretical manner and it is
possible to study the material behaviour during its hardening process. Others parameters
can be changed to improve the connexion with the experimental data.
The purpose of this project is to approach an ultrasonic technique through a computed
process with the help of Comsol Multiphysics.
Two methods of calculation were used to compare the experimental and computed results.
The results are relatively mixed:
According to the results obtained by the first calculation method, this one appears no
appropriate and no conclusive since they did not concur with the experimental ones. Indeed,
human errors can be promoted because of the numerous steps required. It takes much
time, between 2 and 3 days to treat data, without taking in account the time used for
realizing one simulation (between 5 and 10 days). So, a second calculation method was
The second calculation approach was similar to the first one, but easier, quicker and
provided relatively good results -a graph given by experimentation could be
represented/approached by the software - . Therefore, this method seems to answer to the
will of approaching experimental results with the use of software.
To conclude, it would be pertinent and useful to refine this method through further studies,
in order to reduce errors and increase the agreement between reality and modelling.
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