Finite element analysis of a femoral retrograde intramedullary nail subject to gait loading

Zalzal, Paul; Bhandari, Mohit; Spelt, J.K.; Papini, M.

doi:10.1016/j.medengphy.2003.10.006

Cited by 162 publications

(151 citation statements)

References 25 publications

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“…The model is easily adjustable for various fracture types, osteosynthesis devices, and loading scenarios and it is wellvalidated for a range of fracture types. So far there are very few studies that investigated the mechanical performance with a numerical model that has been validated by strain measurements on an implanted intramedullary nail [6].…”

Section: Discussionmentioning

confidence: 99%

“…The FE model consisted of the digital model of a Gamma3 Trochanteric Nail 180 (Stryker Osteosynthesis, Schoenkirchen/Kiel, Germany) and the so-called standardized femur [11]. The standardized femur is a 3-D solid model derived from a CT-scan dataset of a large left third-generation synthetic femur (model 3306, Sawbones AB, Malmo, Sweden) made available in the public domain [6]. This model differentiates between cortical and cancellous bone and includes an intramedullary canal.…”

Section: Methodsmentioning

confidence: 99%

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Type of Hip Fracture Determines Load Share in Intramedullary Osteosynthesis

Eberle

Gerber

Oldenburg

et al. 2009

Clinical Orthopaedics &Amp; Related Research

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The choice of the appropriate implant continues to be critical for fixation of unstable hip fractures. Therefore, the goal of this study was to develop a numerical model to investigate the mechanical performance of hip fracture osteosynthesis. We hypothesized that decreasing fracture stability results in increasing load share of the implant and therefore higher stress within the implant. We also investigated the relationship of interfragmentary movement to the fracture stability. A finite element model was developed for a cephalomedullary nail within a synthetic femur and simulated a pertrochanteric fracture, a lateral neck fracture, and a subtrochanteric fracture. The femur was loaded with a hip force and was constrained physiologically. The FE model was validated by mechanical experiments. All three fractures resulted in similar values for stiffness (462-528 N/mm). The subtrochanteric fracture resulted in the highest local stress (665 MPa), and the pertrochanteric fracture resulted in a lower stress (621 MPa) with even lower values for the lateral neck fracture (480 MPa). Thus, intramedullary implants can stabilize unstable hip fractures with almost the same amount of stiffness as seen in stable fractures, but they have to bear a higher load share, resulting in higher stresses in the implant.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Type of Hip Fracture Determines Load Share in Intramedullary Osteosynthesis

Eberle

Gerber

Oldenburg

et al. 2009

Clinical Orthopaedics &Amp; Related Research

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“…The same material properties values were used in macroscopic and mesoscopic levels of analysis. Cancellous bone was assumed to be isotropic material with E = 206 MPa and the Poisson ratio of 0.33 (Cheung et al 2004;Deligianni et al 1991). …”

Section: Methodsmentioning

confidence: 99%

Multilevel finite element modeling for the prediction of local cellular deformation in bone

Deligianni

Apostolopoulos

2007

Biomech Model Mechanobiol

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The underlying mechanisms by which bone cells respond to mechanical stimuli or how mechanical loads act on osteocytes housed in lacunae in bone are not well understood. In this study, a multilevel finite element (FE) approach is applied to predict local cell deformations in bone tissue. The local structure of the matrix dictates the local mechanical environment of an osteocyte. Cell deformations are predicted from detailed linear FE analysis of the microstructure, consisting of an arrangement of cells embedded in bone matrix material. This work has related the loads applied to a whole femur during the stance phase of the gait cycle to the strain of a single lacuna and of canaliculi. The predicted bone matrix strains around osteocyte lacunae and canaliculi were nonuniform and differed significantly from the macroscopically measured strains. Peak stresses and strains in the walls of the lacuna were up to six times those in the bulk extracellular matrix. Significant strain concentrations were observed at sites where the process meets the cell body.

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“…Also, the geometric model of a standard femur from Cheung et al [53] was used. A simulation of the femur alone is run first.…”

Section: Numerical Examplesmentioning

confidence: 99%

Numerical Simulation of Bone Remodeling Process Considering Interface Tissue Differentiation in Total Hip Replacements

Fancello

Dallacosta

Roesler

2010

Biomechanics of Hard Tissues

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Finite element analysis of a femoral retrograde intramedullary nail subject to gait loading

Cited by 162 publications

References 25 publications

Type of Hip Fracture Determines Load Share in Intramedullary Osteosynthesis

Type of Hip Fracture Determines Load Share in Intramedullary Osteosynthesis

Multilevel finite element modeling for the prediction of local cellular deformation in bone

Numerical Simulation of Bone Remodeling Process Considering Interface Tissue Differentiation in Total Hip Replacements

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