Item type:Thesis, Open Access

Femorale Umbauprozesse nach totaler Hüftendoprothese Finite-Elemente-Analyse 12 Jahre nach Operation

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Date

2005-11-11

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Philipps-Universität Marburg
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Abstract

Periprosthetic stress shielding after total hip arthroplasty (THA) is a well known phenomenon. Many authors have used the finite element (FE) method to show the effects of THA on animal or human femora. In most cases they have performed cadaver experiments. The first project is a FE analysis based on a retrospective computerized tomography (CT) in vivo data-set of 11 patients 12 years after THA. In order to control the analysis, a computationally created stem was implanted at the femur model of the not operated contralateral side. In comparison to the not operated side, there was a significant reduction of the strain energy density (SED) values in all regions of interest (ROI) with the greatest effect near the distal tip of the stem. Only zone 1 showed no clear trend which may be due to load application at the greater trochanter causing local strain peaks. The median SED values changed by -31.65% (ROI 1), -25.64% (ROI 2), -30.82% (ROI 3), -12.35% (ROI 4), -40.10% (ROI 5), -30.37% (ROI 6), -43.38% (ROI 7). The second objective is to collect 5 years prospective volumetric bone density data with a clinical computerized tomography (CT) study in six patients after cemented THA. With respect to the postoperative control a significantly lower density in ROI (region of interest) 2 (p=0.014), ROI 3 (p=0.023), ROI 4 (p=0.023), ROI 5 (p=0.014) and ROI 6 (p=0.014) is found. Maximum density decrease was observed in ROI 2 (median: 125.5 HU) and 3 (median: 116.7 HU). Analysis after 60 months with respect to the 24 months control demonstrated a significantly lower density in ROI 2 (p=0.014), ROI 5 (p=0.023).

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Dates
Created: 2005Issued: 2005-11-11Updated: 2011-08-10
DOI
https://doi.org/10.17192/z2005.0558
Faculty
Medizin
Publisher
Philipps-Universität Marburg
Language
ger
Data types
DoctoralThesis
Keywords
knöcherne AnpassungsreaktionenBone densityStress shieldingFinite ElementeTEPBone remodellingOsteodensitometrieStress ShieldingTHAFinite element
DFG-subjects
OsteodensitometrieFinite ElementeTHATEP
DDC-Numbers
610
License
https://rightsstatements.org/vocab/InC-NC/1.0/
URI
https://open.uni-marburg.de/handle/10.17192/z2005.0558
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Burchard, Christoph Rene (130543470): Femorale Umbauprozesse nach totaler Hüftendoprothese Finite-Elemente-Analyse 12 Jahre nach Operation. : Philipps-Universität Marburg 2005-11-11. DOI: https://doi.org/10.17192/z2005.0558.

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This item has been published with the following license: In Copyright