Finite element analysis of acetabular fractures—development and validation with a synthetic pelvis

Shim, Vickie; Böhme, Jörg; Vaitl, Peter; Klima, Stefan; Josten, Christoph; Anderson, Iain A.

doi:10.1016/j.jbiomech.2010.01.017

Cited by 29 publications

(18 citation statements)

References 24 publications

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“…This enabled us to perform much more detailed comparisons than similar studies which were based on either Gruen Zones or some arbitrary regions of interest [15][16][17]. This approach has been validated with in-vitro mechanical experiment [12,18].…”

Section: Methodsmentioning

confidence: 99%

Quantitative CT with finite element analysis: towards a predictive tool for bone remodelling around an uncemented tapered stem

Shim

Pitto

Anderson

2012

International Orthopaedics (SICOT)

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Purpose We used quantitative CT in conjunction with finite element analysis to provide a new tool for assessment of bone quality after total hip arthroplasty in vivo. The hypothesis of this prospective five-year study is that the combination of the two modalities allows 3D patientspecific imaging of cortical and cancellous bone changes and stress shielding. Method We tested quantitative CT in conjunction with finite elements on a cohort of 29 patients (31 hips) who have been scanned postoperatively and at one year, two years and five years follow-up. The method uses cubic Hermite finite element interpolation for efficient mesh generation directly from qCT datasets. The element Gauss points that are used for the geometric interpolation functions are also used for interpolation of osteodensitometry data. Results The study showed changes of bone density suggestive of proximal femur diaphysis load transfer with osteointegration and moderate metaphyseal stress shielding. Our model revealed that cortical bone initially became porous in the greater trochanter, but this phenomenon progressed to the cortex of the lesser trochanter and the posterior aspect of the metaphysis. The diaphyseal area did not experience major change in bone density for either cortical or cancellous bone. Conclusion The combination of quantitative CT with finite element analysis allows visualization of changes to bone density and architecture. It also provides correlation of bone density/architectural changes with stress patterns enabling the study of the effects of stress shielding on bone remodelling in vivo. This technology can be useful in predicting bone remodeling and the quality of implant fixation using prostheses with different design and/or biomaterials.

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Section: Methodsmentioning

confidence: 99%

Quantitative CT with finite element analysis: towards a predictive tool for bone remodelling around an uncemented tapered stem

Shim

Pitto

Anderson

2012

International Orthopaedics (SICOT)

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“…Therefore, we employed the same boundary conditions as our material property estimations, but instead increased the magnitude of the applied force in steps of 100 N until the maximum von Mises stress was greater than 100 MPa. Specifically, tendon rupture was defined to be in the region of the tendon where 15 or more consecutive Gauss points had von Mises stress greater than 100 MPa (Shim et al, 2010). The 15 Gauss points roughly corresponded to the length of 3 mm in our model, which was considered large enough to lead to a rupture.…”

Section: Predicting Stress Patterns and Tendon Rupture Using Virtual mentioning

confidence: 99%

Subject-specific finite element analysis to characterize the influence of geometry and material properties in Achilles tendon rupture

Shim

Fernandez

Gamage

et al. 2014

Journal of Biomechanics

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“…If cadaver bone is to be used, the issue of sample variability and the requirement of ethics approval, special storage and high cost need to be resolved first. Therefore the aim of this study is to develop a finite element model of the pelvis that can accurately predict the fracture load and locations of acetabular fractures and validate its performance with synthetic PU-foam based bones (Shim et al, 2010).…”

Section: Development and Validation Of Finite Element Fracture Predicmentioning

confidence: 99%

“…Two sets of data point clouds, which accurately described the shapes of the fragment and the fractured pelvis, were obtained ( Figure 17). The fractured pelvis model was developed from our previous FE model of the pelvis, which was generated from CT scans of the synthetic pelvis used in the experiment (Shim et al, 2010) . Our elements had inhomogeneous location dependent material properties despite large element size and different material properties were assigned to solid and cellular polyurethane foams which mimic cortical and cancellous bone properties separately.…”

Section: Finite Element Simulationmentioning

confidence: 99%

Use of Polyurethane Foam in Orthopaedic Biomechanical Experimentation and Simulation

Shim¹,

Boheme²,

Josten³

et al. 2012

Polyurethane

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Finite element analysis of acetabular fractures—development and validation with a synthetic pelvis

Cited by 29 publications

References 24 publications

Quantitative CT with finite element analysis: towards a predictive tool for bone remodelling around an uncemented tapered stem

Quantitative CT with finite element analysis: towards a predictive tool for bone remodelling around an uncemented tapered stem

Subject-specific finite element analysis to characterize the influence of geometry and material properties in Achilles tendon rupture

Use of Polyurethane Foam in Orthopaedic Biomechanical Experimentation and Simulation

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