Numerical investigations on the strain-adaptive bone remodelling in the periprosthetic femur

influence of the boundary conditions

verfasst von

Bernd-Arno Behrens, Ingo Nolte, Patrick Wefstaedt, Christina Stukenborg-Colsman, Anas Bouguecha

Abstract

BACKGROUND: There are several numerical investigations on bone remodelling after total hip arthroplasty (THA) on the basis of the finite element analysis (FEA). For such computations certain boundary conditions have to be defined. The authors chose a maximum of three static load situations, usually taken from the gait cycle because this is the most frequent dynamic activity of a patient after THA.

MATERIALS AND METHODS: The numerical study presented here investigates whether it is useful to consider only one static load situation of the gait cycle in the FE calculation of the bone remodelling. For this purpose, 5 different loading cases were examined in order to determine their influence on the change in the physiological load distribution within the femur and on the resulting strain-adaptive bone remodelling. First, four different static loading cases at 25%, 45%, 65% and 85% of the gait cycle, respectively, and then the whole gait cycle in a loading regime were examined in order to regard all the different loadings of the cycle in the simulation.

RESULTS: The computed evolution of the apparent bone density (ABD) and the calculated mass losses in the periprosthetic femur show that the simulation results are highly dependent on the chosen boundary conditions.

CONCLUSION: These numerical investigations prove that a static load situation is insufficient for representing the whole gait cycle. This causes severe deviations in the FE calculation of the bone remodelling. However, accompanying clinical examinations are necessary to calibrate the bone adaptation law and thus to validate the FE calculations.

Organisationseinheit(en)

Institut für Umformtechnik und Umformmaschinen

Externe Organisation(en)

Stiftung Tierärztliche Hochschule Hannover
Medizinische Hochschule Hannover (MHH)

Typ

Artikel

Journal

Biomedical engineering online

Band

Seiten

ISSN

1475-925X

Publikationsdatum

16.04.2009

Publikationsstatus

Veröffentlicht

Peer-reviewed

Elektronische Version(en)

https://doi.org/10.1186/1475-925X-8-7 (Zugang: Unbekannt)

Details im Forschungsportal „Research@Leibniz University“

BibTeX

@article{082fd8a8925c4f90b93aa08616df4ffd,
title = "Numerical investigations on the strain-adaptive bone remodelling in the periprosthetic femur: influence of the boundary conditions",
abstract = "BACKGROUND: There are several numerical investigations on bone remodelling after total hip arthroplasty (THA) on the basis of the finite element analysis (FEA). For such computations certain boundary conditions have to be defined. The authors chose a maximum of three static load situations, usually taken from the gait cycle because this is the most frequent dynamic activity of a patient after THA.MATERIALS AND METHODS: The numerical study presented here investigates whether it is useful to consider only one static load situation of the gait cycle in the FE calculation of the bone remodelling. For this purpose, 5 different loading cases were examined in order to determine their influence on the change in the physiological load distribution within the femur and on the resulting strain-adaptive bone remodelling. First, four different static loading cases at 25%, 45%, 65% and 85% of the gait cycle, respectively, and then the whole gait cycle in a loading regime were examined in order to regard all the different loadings of the cycle in the simulation.RESULTS: The computed evolution of the apparent bone density (ABD) and the calculated mass losses in the periprosthetic femur show that the simulation results are highly dependent on the chosen boundary conditions.CONCLUSION: These numerical investigations prove that a static load situation is insufficient for representing the whole gait cycle. This causes severe deviations in the FE calculation of the bone remodelling. However, accompanying clinical examinations are necessary to calibrate the bone adaptation law and thus to validate the FE calculations.",
keywords = "Adaptation, Physiological/physiology, Bone Remodeling/physiology, Computer Simulation, Elastic Modulus/physiology, Femur/physiology, Hip Prosthesis, Humans, Mechanotransduction, Cellular/physiology, Models, Biological, Stress, Mechanical",
author = "Bernd-Arno Behrens and Ingo Nolte and Patrick Wefstaedt and Christina Stukenborg-Colsman and Anas Bouguecha",
year = "2009",
month = apr,
day = "16",
doi = "10.1186/1475-925X-8-7",
language = "English",
volume = "8",
pages = "7",
journal = "Biomedical engineering online",
issn = "1475-925X",
publisher = "BioMed Central Ltd.",
}