Experimental modal analysis on fresh-frozen human hemipelvic bones employing a 3D laser vibrometer for the purpose of modal parameter identification

Neugebauer, R.; Werner, Michael; Voigt, Christian; Steinke, Hanno; Scholz, R.; Scherer, S.; Quickert, M.

doi:10.1016/j.jbiomech.2011.03.005

Cited by 25 publications

(21 citation statements)

References 8 publications

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“…[8] Models which can be found in the literature usually model an intact, uninjured hemipelvis, sometimes an intact whole pelvis. [9][10][11][12] It is widely accepted that in case of a finite element pelvic ring model, it is the rate of the cortical bone that mainly determines the properties of the model. [10,11,14] That was the main reason, why with the aid of CT images we adjusted our previously used 10%: 90%, cortical-cancellous bone ratio.…”

Section: Discussionmentioning

confidence: 99%

“…[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%

“…[13] However, according to the CT scans, and the literature the ratio of the cortical bone is higher. [9,10,14] We determined the ratio of the cortical and cancellous bone substance based on the CT scans, and the average, common material properties were calculated from this percentual ratio (Figure 3). We performed the measurements on 10 points both on the sacrum and the pelvis, thus we could retrieve Figure 3.…”

Section: Changing Of Materials Propertiesmentioning

confidence: 99%

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

Sztrinkai¹,

Bodzay²,

Pajor³

et al. 2014

Eklem Hastalik Cerrahisi

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

Section: Changing Of Materials Propertiesmentioning

confidence: 99%

See 2 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

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“…Neugebauer et al [19] have used an electrodynamic shaker for the excitation of the structure and a three-dimensional (3D) laser vibrometer for frequency measurement. An accelerometer and microphone pair is also commonly used to determine eigenfrequencies [12,13].…”

Section: Introductionmentioning

confidence: 99%

Calculation of the elastic properties of prosthetic knee components with an iterative finite element-based modal analysis: quantitative comparison of different measuring techniques

Woiczinski

Tollrian

Schröder

et al. 2013

Biomedizinische Technik/Biomedical Engineering

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Abstract:With the aging but still active population, research on total joint replacements relies increasingly on numerical methods, such as finite element analysis, to improve wear resistance of components. However, the validity of finite element models largely depends on the accuracy of their material behavior and geometrical representation. In particular, material properties are often based on manufacturer data or literature reports, but can alternatively be estimated by matching experimental measurements and structural predictions through modal analyses and identification of eigenfrequencies. The aim of the present study was to compare the accuracy of common setups used for estimating the eigenfrequencies of typical components often used in prosthetized joints. Eigenfrequencies of cobalt-chrome and ultra-high-molecular weight polyethylene components were therefore measured with four different setups, and used in modal analyses of corresponding finite element models for an iterative adjustment of their material properties. Results show that for the low-damped cobalt chromium endoprosthesis components, all common measuring setups provided accurate measurements. In the case of high-damped structures, measurements were only possible with setups including a continuously excitation system such as electrodynamic shakers. This study demonstrates that the iterative backcalculation of eigenfrequencies can be a reliable method to estimate the elastic properties for finite element models.

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Finite Element Analysis of Bone and Experimental Validation

Almeida

Completo

2020

The Computational Mechanics of Bone Tissue

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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.

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Experimental modal analysis on fresh-frozen human hemipelvic bones employing a 3D laser vibrometer for the purpose of modal parameter identification

Cited by 25 publications

References 8 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

Calculation of the elastic properties of prosthetic knee components with an iterative finite element-based modal analysis: quantitative comparison of different measuring techniques

Finite Element Analysis of Bone and Experimental Validation

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