Finite element stress analysis of a hybrid fracture fixation plate

Metal plates are commonly used in the operative treatment of bone fractures. Rigid metal plates stabilize the fracture site, maintain good contact between bone fragments and allow early weight bearing and patient mobility. However, treatment with rigid metal plates can cause localized bone atrophy d...

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Bibliographic Details
Published in:Medical engineering & physics 1996-04, Vol.18 (3), p.241-250
Main Authors: Ferguson, S.J., Wyss, U.P., Pichora, D.R.
Format: Article
Language:English
Subjects:
Animals
Biocompatible Materials
Biological and medical sciences
bone plate
Bone Plates
Computerized, statistical medical data processing and models in biomedicine
Dogs
Equipment Design
finite element analysis
Fracture fixation
Fracture Fixation, Internal - instrumentation
Humans
Materials Testing
Medical sciences
Metals
Models and simulation
Polymers
Stress, Mechanical
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Summary:Metal plates are commonly used in the operative treatment of bone fractures. Rigid metal plates stabilize the fracture site, maintain good contact between bone fragments and allow early weight bearing and patient mobility. However, treatment with rigid metal plates can cause localized bone atrophy due to stress-shielding and interference with blood circulation, and the weakened bone can refracture after plate removal. A hybrid bone plate system that combines the torsional and bending rigidity of a metal plate with the axial compliance of a polymer insert has been designed. A three-dimensional, quarter-symmetric finite element model was generated for a canine femur diaphysis plated with this metal/polymer hybrid design. A model with a standard metal fixation plate was also generated for comparison purposes. The stress state in the underlying bone was examined for several loading conditions taken from published in vivo studies. The finite element model was used to study the performance of biodegradable polymer inserts in the plate system. The flexible plate reduced stress-shielding effects at the fracture site when subjected to an axial load. The bending strength of the plate was not compromised by the addition of the polymer inserts. Biodegradable inserts further enhanced the performance of the new plate design, transferring less of the axial load to the plate as the inserts broke down.
ISSN:1350-4533
1873-4030
DOI:10.1016/1350-4533(95)00041-0