Concept and development of an orthotropic FE model of the proximal femur

Wirtz, Dieter Christian; Pandorf, Thomas; Portheine, F.; Radermacher, Klaus; Schiffers, Norbert; Prescher, Andreas; Weichert, Dieter; Niethard, Fritz U.

doi:10.1016/s0021-9290(02)00309-3

Cited by 56 publications

(31 citation statements)

References 14 publications

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“…Many researches [13,16,[18][19][20][21] have not considered the anisotropy of the femoral bone, although numerous experiments have proven that the femur has no isotropic elasticity properties [14,25,26]. In order to have a realistic simulation of the load distribution in the femur, a description of the bone elasticity properties as exact as possible is crucial.…”

Section: Fig 1 Loading Of the Femur (Data Obtained From Reference [17])mentioning

confidence: 99%

Numerical investigations of stress shielding in total hip prostheses

Behrens

Wirth

Nolte

et al. 2008

Proc Inst Mech Eng H

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Aseptic loosening of the prosthesis is still a problem in artificial joint implants. The loosening can be caused by, among other factors, resorption of the bone surrounding the prosthesis owing to stress shielding. In order to find out the influence of the prosthesis type on post-operative stress shielding, a static finite element analysis of a femur provided with the conventional uncemented stem BICONTACT and of one with the femoral neck prosthesis SPIRON was carried out. Strain energy densities and maximal principal strain distributions were calculated and compared with the physiological situation. Here, stress shielding was demonstrated in both periprosthetic femora. To determine the areas of the stress shielding, the bone in each FE model was subdivided into three regions of interest (ROI): proximal, diaphyseal, and distal. The numerical computations show stress shielding in the proximal ROI of both periprosthetic femora. Diaphyseally, the femoral neck prosthesis SPIRON, in contrast to the conventional uncemented long-stem prosthesis BICONTACT, causes no decrease in the strain distribution and thus no stress shielding. Distally, no change in the load distribution of either periprosthetic femur could be found, compared with the physiological situation.

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Section: Fig 1 Loading Of the Femur (Data Obtained From Reference [17])mentioning

confidence: 99%

Numerical investigations of stress shielding in total hip prostheses

Behrens

Wirth

Nolte

et al. 2008

Proc Inst Mech Eng H

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“…Empirical relations between the orthotropic constants and bone density have been suggested by several authors [29][30][31][32][33][34]. Nevertheless, the determination of material trajectories related to the trabecular orientations from clinical quantitative computed tomography (QCT) scans remains an open question [64,71,74,86].…”

Section: Introductionmentioning

confidence: 99%

A quasi-brittle continuum damage finite element model of the human proximal femur based on element deletion

Hambli

2012

Med Biol Eng Comput

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“…This CAD-based approach has some distinct disadvantages as shown by Young et al [58] in an analysis of studies conducted by Viceconti et al [59], Schmitt et al [60], and Wirtz et al [61] in deriving medical computational models from raw medical data. The AutoCAD-based meshing algorithms were time-intensive compared to automated mesh generation algorithms and that a satisfactory model could not be generated without a significant degree of manual post-processing.…”

Section: Kubit and Rapidform Xor Programsmentioning

confidence: 99%

Processing of Terrestrial Laser Scanning Point Cloud Data for Computational Modelling of Building Facades

Laefer¹,

Truong-Hong²,

Fitzgerald³

2011

CSENG

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Abstract:With the rapidly increasing availability of laser scanning data and the growing pressure to use it as the basis for computational models, there has been heighten interest in quickly, costeffectively, and accurately processing the resulting point cloud data sets so that they are compatible for importation into computational models. This paper presents traditional strategies for solid model generation and examines in detail innovations and continuing limitations of recent patents, newly published research, and some currently available commercial programs for the transformation of laser scanning point cloud data into solid models appropriate for finite element method meshing and various meshing strategies particularly well-suited for point cloud data.

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Concept and development of an orthotropic FE model of the proximal femur

Cited by 56 publications

References 14 publications

Numerical investigations of stress shielding in total hip prostheses

Numerical investigations of stress shielding in total hip prostheses

A quasi-brittle continuum damage finite element model of the human proximal femur based on element deletion

Processing of Terrestrial Laser Scanning Point Cloud Data for Computational Modelling of Building Facades

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