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Forschungsdatenbank PMU-SQQUID

A biomechanical evaluation of orthopaedic implants for hip fractures by finite element analysis and in-vitro tests.
Eberle, S; Gerber, C; von Oldenburg, G; Högel, F; Augat, P;
Proc Inst Mech Eng H. 2010; 224(10): 1141-1152.
Originalarbeiten (Zeitschrift)

PMU-Autor/inn/en

Augat Peter
Högel Florian

Abstract

The aim of this study was to test the hypothesis that a reinforced gamma nail for the fixation of subtrochanteric fractures would experience less stress during loading compared with a common gamma nail. The issue of whether the use of the stronger implant would result in more stress shielding in the surrounding bone was also addressed. A finite element analysis (FEA) of a synthetic bone was employed to calculate the stress distribution in implant and bone for two fracture types (AO 31-A3.1 and AO 31-A3.3). The FEA was validated by mechanical tests on six synthetic femurs. To test the hypothesis in vitro, mechanical tests on six pairs of fresh-frozen human femurs were conducted. The femurs were supplied with a common or a reinforced gamma nail in a cross-over study design. Strains were measured on the nail shaft to quantify the loading of the nail. The FEA resulted in 3-51 per cent lower stresses for the reinforced gamma nail. No increase in stress shielding could be observed. In the in-vitro tests, the reinforced gamma nail experienced less strain during loading (p < 0.016). The study demonstrated the benefit of a reinforced gamma nail in subtrochanteric fractures. It experienced less stress but did not result in more stress shielding.


Useful keywords (using NLM MeSH Indexing)

Aged

Biomechanics

Bone Nails*

Female

Femur/surgery*

Finite Element Analysis*

Humans

Male

Middle Aged

Models, Biological

Reproducibility of Results


Find related publications in this database (Keywords)

finite element analysis
standardized femur
osteosynthesis
intramedullary implant
hip fracture
in-vitro test
biomechanics
gamma nail