Validation of density–elasticity relationships for finite element modeling of human pelvic bone by modal analysis

Scholz, R.; Hoffmann, Falk; Sachsen, Sandra von; Drossel, Welf‐Guntram; Klöhn, Carsten; Voigt, Christian

doi:10.1016/j.jbiomech.2013.07.045

Cited by 21 publications

(23 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[8][9][10] Although several finite element pelvic models were created in the past, they modelled either just the hemi pelvic bone, or albeit a whole one. They did not include the possible fracture types and fixation techniques.…”

Section: Objectivesmentioning

confidence: 99%

“…They did not include the possible fracture types and fixation techniques. [9][10][11][12] In this study, we aimed to create a finite element pelvic model, which not only shows the whole pelvic ring, but also enables us to compare the stability of different fixation techniques applied in certain types of fractures.…”

Section: Objectivesmentioning

confidence: 99%

“…According to the relevant literature, [10,11,14] it is the proportion of the cortical part, which can be evaluated based on the computed tomography (CT)-scan images, which mainly determines the characteristics of the model. The most commonly used method is determination of the elasticity from the density, [10,[15][16][17][18] although such a value explicitly for the pelvis bone has not been determined to date.…”

Section: Objectivesmentioning

confidence: 99%

“…The most commonly used method is determination of the elasticity from the density, [10,[15][16][17][18] although such a value explicitly for the pelvis bone has not been determined to date. Recommendations for the most feasible density-elasticity relationship are already available.…”

Section: Objectivesmentioning

confidence: 99%

“…Recommendations for the most feasible density-elasticity relationship are already available. [10,15] In our study, we chose a simply method by measuring the cortical: cancellous bone ratio on the CT image slices in a given area and then using material properties taken from the literature, [19] and we calculated the material properties specific to the examined regions. As the aim of our study was to compare different fixation techniques used in the therapy of fractures, the amount of details obtained with this method was satisfactory.…”

Section: Objectivesmentioning

confidence: 99%

See 4 more Smart Citations

Further development of our finite element pelvic model to compare fixation methods for pelvic fractures

Sztrinkai¹,

Bodzay²,

Pajor³

et al. 2014

Eklem Hastalik Cerrahisi

View full text Add to dashboard Cite

Amaç: Bu çalışmada her türlü kırığın bilgisayarlı simülas-yonuna uygun olan ve güvenilir sonuçlar veren gerçekçi bir model yaratıldı. Hastalar ve yöntemler: İleri numune elde edebilmek için plastik bir pelvis modeli kullanıldı. Veriler sağlıklı bir pelvisin bilgisayarlı tomografi taramasından elde edildi. Üç boyutlu plastik pelvis taraması ile geometrik olarak kesin bir model oluşturuldu. Bilgisayarlı tomografi taramalarından elde edilen verilere göre kemikli kısımların materyal özellikleri modifiye edildi. Pelvis farklı segmentlere ayrıldı ve materyal özelliklerinin doğru olması için her segmentte kortikal ve kansellöz kemik maddesinin oranı tayin edildi. Pelvis modelinin doğrulanmasında, tip C pelvis hasarının simülasyonu yapıldı ve sakrum kırığı ve semfizyoliz plaklar ile stabilize edildi. Bu veriler daha önceki kadavra deneylerinden elde edilen veriler ile karşılaştırıldı. Bulgular: Yeni model üzerinde yapılan simülasyona göre, sakrum kırığının fragmanları arasındaki kayma değerleri, kadavra deneylerinde bildirilen değerlere yakındı ve artan gerilme tolere edilebilir aralıkta kaldı. Sonuç: Yeni sonlu eleman pelvis modelimiz, eski modele göre, pelvisi daha doğru yansıtmaktadır. Modelin doğ-rulaması başarılı olduğundan, güvenilir sonuçlar ile bu yöntem her türlü kırığın bilgisayarlı simülasyonu için uygundur.Anahtar sözcükler: Sonlu eleman analizi; kırık tespiti; pelvis kemiği. Objectives:In this study, we aimed to create a realistic model which is suitable for computerized simulation of any kind of fractures and provides reliable results. Patients and methods: We used a plastic pelvic model to construct advanced specimens. The data were retrieved from the computed tomography scans of a healthy pelvis. A geometrically exact model by the means of three-dimensional scanning of the plastic pelvis was obtained. The material properties of the bony parts based on the data retrieved from the computed tomography scans were modified. The pelvis was divided into distinct segments and the proportion of the cortical and cancellous bone substance in each segment were determined to make the material properties accurate. In the validation of the pelvic model, a type C pelvic injury was simulated and the fracture of the sacrum and the symphyseolysis were stabilized with plates. These data were compared with those of previously performed cadaver experiments. Results: Based on the simulation performed on the new model, the shift values between the fragments of the broken sacrum approximated the reported values of our cadaver experiments and also arising strains remained in the tolerable interval. Conclusion: Our new finite element pelvic model represents the pelvis more accurately than the former one. As the validation of the model was successful, it is suitable for computerized simulation of any kind of fractures offering reliable results.

show abstract

Section: Objectivesmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

See 3 more Smart Citations

Further development of our finite element pelvic model to compare fixation methods for pelvic fractures

Sztrinkai¹,

Bodzay²,

Pajor³

et al. 2014

Eklem Hastalik Cerrahisi

View full text Add to dashboard Cite

show abstract

Finite Element Analysis of Bone and Experimental Validation

Almeida

Completo

2020

The Computational Mechanics of Bone Tissue

View full text Add to dashboard Cite

This chapter describes the application of the finite element (FE) method to bone tissues. The aspects that differ the most between bone and other materials' FE analysis are the type of elements used, constitutive models, and experimental validation. These aspects are looked at from a historical evolution stand point. Several types of elements can be used to simulate similar bone structures and within the same analysis many types of elements may be needed to realistically simulate an anatomical part. Special attention is made to constitutive models, including the use of density-elastic ity relationships made possible through CT-scanned images. Other more complex models are also described that include viscoelasticity and anisotropy. The importance of experimental validation is discussed, describing several methods used by different authors in this challenging field. The use of cadaveric human bones is not always possible or desirable and other options are described, as the use of animal or artificial bones. Strain and strain rate measuring methods are also discussed, such as rosette strain gauges and optical devices.

show abstract

Material model of pelvic bone based on modal analysis: a study on the composite bone

Henyš

Čapek

2016

Biomech Model Mechanobiol

View full text Add to dashboard Cite

Digital models based on finite element (FE) analysis are widely used in orthopaedics to predict the stress or strain in the bone due to bone-implant interaction. The usability of the model depends strongly on the bone material description. The material model that is most commonly used is based on a constant Young's modulus or on the apparent density of bone obtained from computer tomography (CT) data. The Young's modulus of bone is described in many experimental works with large variations in the results. The concept of measuring and validating the material model of the pelvic bone based on modal analysis is introduced in this pilot study. The modal frequencies, damping, and shapes of the composite bone were measured precisely by an impact hammer at 239 points. An FE model was built using the data pertaining to the geometry and apparent density obtained from the CT of the composite bone. The isotropic homogeneous Young's modulus and Poisson's ratio of the cortical and trabecular bone were estimated from the optimisation procedure including Gaussian statistical properties. The performance of the updated model was investigated through the sensitivity analysis of the natural frequencies with respect to the material parameters. The maximal error between the numerical and experimental natural frequencies of the bone reached 1.74 % in the first modal shape. Finally, the optimised parameters were matched with the data sheets of the composite bone. The maximal difference between the calibrated material properties and that obtained from the data sheet was 34 %. The optimisation scheme of the FE model based on the modal analysis data provides extremely useful calibration of the FE models with the uncertainty bounds and without the influence of the boundary conditions.

show abstract

Validation of density–elasticity relationships for finite element modeling of human pelvic bone by modal analysis

Cited by 21 publications

References 22 publications

Further development of our finite element pelvic model to compare fixation methods for pelvic fractures

Further development of our finite element pelvic model to compare fixation methods for pelvic fractures

Finite Element Analysis of Bone and Experimental Validation

Material model of pelvic bone based on modal analysis: a study on the composite bone

Contact Info

Product

Resources

About