FE and experimental study on how the cortex material properties of synthetic femurs affect strain levels

Lopes, Vitor M.M.; Neto, Maria Augusta; Amaro, Ana M.; Roseiro, Luís; Paulino, Maria F.

doi:10.1016/j.medengphy.2017.06.001

Cited by 17 publications

(20 citation statements)

References 69 publications

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“…Similar findings were reported for the experimental study carried out by Vitor M.M. Lopes et al, 2017, where they constrained the model at 94mm above the condyle region. The total displacement obtained in their study was about 3.3mm for 1000N load [9].…”

Section: Discussionsupporting

confidence: 86%

“…Lopes et al, 2017, where they constrained the model at 94mm above the condyle region. The total displacement obtained in their study was about 3.3mm for 1000N load [9]. In the present study, the total deformation reported was 3.458 mm for identical bisection of 75%.…”

Section: Discussionmentioning

confidence: 99%

“…The load was applied from femoral head normal to its axis which was almost 4 times the body weight [12]. The distal end of the femur (condyle region) was constrained in accordance with the previous works [13,20,9,33,39]. In order to determine the effect of fixed support in the analysis of the femur, the bisection of the femur was carried out based on the constraints adopted in both experimental and numerical studies available in the literature.…”

Section: Methodsmentioning

confidence: 99%

“…In a study by Vitor M.M. Lopes et al, 2017, the full femur was considered and it was fixed at 94mm from the condyle region [9]. Lorenzo Grassi et al, 2016, validated the finite element models of human femora against experimental data from three cadaver femora.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study of Femur Bone Having Different Boundary Conditions and Bone Structure Using Finite Element Method

Chethan

Zuber

Bhat

et al. 2018

TOBEJ

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Background:Femur bone is an important part in human which basically gives stability and support to carry out all day to day activities. It carries loads from upper body to lower abdomen.Objective:In this work, the femur having composite structure with cortical, cancellous and bone marrow cavity is bisected from condyle region with respect to 25%, 50% and 75% of its height. There is considerable difference in the region chosen for fixing all degrees of freedom in the analysis of femur.Methods:The CT scans are taken, and 3D model is developed using MIMICS. The developed model is used for static structural analysis by varying the load from 500N to 3000N.Results:The findings for 25% bisected femur model report difference in directional deformation less than 5% for loads 2000N and less. In the study comparing fully solid bone and the composite bone, the total deformation obtained for a complete solid bone was 3.5 mm which was 18.7% less than that determined for the composite bone.Conclusion:The standardization for fixing the bone is developed. And it is required to fix the distal end always with considering full femur bone.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative Study of Femur Bone Having Different Boundary Conditions and Bone Structure Using Finite Element Method

Chethan

Zuber

Bhat

et al. 2018

TOBEJ

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“…Linear elastic isotropic and transversely isotropic material properties were applied, Table 2. The geometry of the numerical model was created in accordance with the geometry of the experimental setup and, afterwards, all the components, except the composite plates, were meshed with 8-noded unstructured regular hexahedral elements, with the incompatible modes effect included as additional degrees of freedom, and using an average element length ranging from 1 mm to 3 mm [21,22]. The accuracy of this numerical model was verified previously by a mesh convergence study and by a comparison with the numerical solution obtained with 10-noded tetrahedral finite elements [23].…”

Section: Finite Element Modelingmentioning

confidence: 99%

The Effect of External Fixator Configurations on the Dynamic Compression Load: An Experimental and Numerical Study

et al. 2019

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(1) Objective: External fixation systems are commonly used by surgeons to ensure stabilization and consolidation of bone fractures, especially in patients who are at high risk for systematic complications. Both rigid and elastic external fixations are important in the fracture healing process. This study aims to evaluate the behavior of the Orthofix Limb Reconstruction System (LRS)® in the dynamic compression mode. (2) Methods: Experimental and numerical setups were developed using a simplified model of a human tibia which consisted of a nylon bar with a diameter of 30 mm. The bone callus was included in both setups by means of a load cell-based system, which consisted of two carbon epoxy laminated composite plates with a final stiffness of 220 N/mm. The system was evaluated experimentally and numerically, considering different numbers of pins and comparing distances between the external fixator frame and the bone, achieving a good correlation between experimental and numerical results. (3) Results: The results identified and quantified the percental load transferred to the fracture and its sensibility to the distance between the external fixator and bone. Additionally, LRS locking stiffness was evaluated which resulted from the clamp-rail clearances. The results show that the blocking effects of the free clamp movement are directly related to the fixator configuration and are responsible for changes in the amount of load that crosses the bone callus. (4) Conclusions: From the biomechanical point of view, the results suggest that the average bending span of Schanz pins and the weights of the patients should be included into clinical studies of external fixators comparisons purpose.

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Finite element modeling of fracture compression by compression plates

Wee,

Spence Reid,

Lewis

2023

Journal Orthopaedic Research

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Dynamic compression plating is a common type of fracture fixation used to compress between bone fragments. The quality of compression across the fracture is important for postoperative stability and primary bone healing. Compression quality may be affected by surgical variations in plate prebend, screw location, screw torque, fracture gap, and implant material. Computational modeling provides a tool for systematically examining these factors, and for visualizing the mechanisms involved. The purpose of this study was to develop a finite element model of dynamic compression plating that includes screw insertion under torque control, establish model credibility through sensitivity analyses and experimental validation, and use the model to examine the effects of surgical variables on fracture compression and postoperative stability. Model‐predicted compressive pressures had good agreement with corresponding synthetic bones experiments under a variety of conditions. Models demonstrated that introducing a 1.5 or 3 mm plate prebend (using a 4.5 mm narrow LCP plate) eliminated gapping at the far cortex, which is consistent with clinical recommendations. However, models also revealed that plate prebend led to sharp decreases in fracture compressive force, exceeding 80% in some cases. A 1.5 mm plate prebend resulted in the most uniform pressures across the fracture. Testing of a simplified model form used in previous computational modeling studies showed large inaccuracies for constructs with plate prebend. This study provides the first experimentally validated computational models of dynamic compression plate fracture fixation, and reveals important effects of plate prebend and fracture gap on fracture compression quality.

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FE and experimental study on how the cortex material properties of synthetic femurs affect strain levels

Cited by 17 publications

References 69 publications

Comparative Study of Femur Bone Having Different Boundary Conditions and Bone Structure Using Finite Element Method

Comparative Study of Femur Bone Having Different Boundary Conditions and Bone Structure Using Finite Element Method

The Effect of External Fixator Configurations on the Dynamic Compression Load: An Experimental and Numerical Study

Finite element modeling of fracture compression by compression plates

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