Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Biomaterials
Abstract number: 25148
BIOMECHANICAL ANALYSIS OF FIXATION OF DIAPHYSEAL BONE DEFECTS
Vasileios SAKELLARIOU, Haridimos TSIBIDAKIS, George MAZIS, Andreas
MAVROGENIS, Panayiotis PAPAGELOPOULOS
1st Orthopaedic Department, University of Athens, Chaidari (GREECE)
Objective: To compare quantitative data on the biomechanical analysis of different
techniques for fixation of intercalary bone defects, by means of consistently applied
methodology on composite models of the adult femur, tibia and humerus. Method: A
total of fifteen femoral, fifteen tibial and fifteen humeral specimens of fourth
generation composite models were used. An intercalary defect (middle 1/5 of the
length of each model) was created and was reconstructed using plates,
intramedullary nails, external fixators and segmental prosthetic implants. The
specimens were loaded under axial compression, four-point-bending and torsion in
the linear elastic region at sub-yield level. Statistical analysis for each bone model
was performed employing a non-parametric analysis of variance for ranked data, in
order to highlight statistically significant differences between techniques. Results:
The analysis for the femur showed no statistically significant differences in the
ranking of techniques (p=0.088). The analysis for the tibia revealed a statistically
significant difference between groups (p=0.035) with the plate construct ranking
lower than the intact. The analysis for the humerus showed statistically significant
differences between groups (p=0.038) with the intramedullary nail and plate
constructs ranking lower than intact. Conclusions: Modular segmental implants and
external fixator ranked better than other techniques, being the ones always exhibiting
the most enhanced performance in comparison to intact specimen.
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