European Society of Biomechanics S.M. Perren Award 2014: Safety factor of the proximal femur during gait: A population-based finite element study

Taddei, Fulvia; Palmadori, Ilaria; Taylor, William R.; Heller, Markus O.; Bordini, Barbara; Toni, Aldo; Schileo, Enrico

doi:10.1016/j.jbiomech.2014.08.030

Cited by 24 publications

(10 citation statements)

References 52 publications

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“…[1,4,28] . In some of these numerical models, tension or compression failures are differentiated [17,31] . Other failure criteria include an equivalent strain criterion to model fracture paths [18] and even more complex criteria, such as a simplified Tsai-Wu criterion to predict failure of trabecular bovine femur [12] .…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Femur Fracture and Experimental Validation Using Bone Simulant

et al. 2017

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Bone fracture pattern prediction is still a challenge and an active field of research. The main goal of this article is to present a combined methodology (experimental and numerical) for femur fracture onset analysis. Experimental work includes the characterization of the mechanical properties and fracture testing on a bone simulant. The numerical work focuses on the development of a model whose material properties are provided by the characterization tests. The fracture location and the early stages of the crack propagation are modelled using the extended finite element method and the model is validated by fracture tests developed in the experimental work. It is shown that the accuracy of the numerical results strongly depends on a proper bone behaviour characterization.

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Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Femur Fracture and Experimental Validation Using Bone Simulant

et al. 2017

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“…Hence, the agonist muscle forces used in the present study are representative of maximal exercises in healthy elderly individuals. Thirdly, present results were obtained for a single individual representing an average-sized elderly Caucasian woman, while variations in musculoskeletal geometry and bone quality are known to affect femoral neck strain [ 30 ]. Nevertheless, the present study provides a first understanding of the mechanical effect in the femoral neck of the hip-spanning muscles in a single representative individual.…”

Section: Discussionmentioning

confidence: 99%

Femoral Neck Strain during Maximal Contraction of Isolated Hip-Spanning Muscle Groups

Martelli

2017

Computational and Mathematical Methods in Medicine

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The aim of the study was to investigate femoral neck strain during maximal isometric contraction of the hip-spanning muscles. The musculoskeletal and the femur finite-element models from an elderly white woman were taken from earlier studies. The hip-spanning muscles were grouped by function in six hip-spanning muscle groups. The peak hip and knee moments in the model were matched to corresponding published measurements of the hip and knee moments during maximal isometric exercises about the hip and the knee in elderly participants. The femoral neck strain was calculated using full activation of the agonist muscles at fourteen physiological joint angles. The 5% ± 0.8% of the femoral neck volume exceeded the 90th percentile of the strain distribution across the 84 studied scenarios. Hip extensors, flexors, and abductors generated the highest tension in the proximal neck (2727 με), tension (986 με) and compression (−2818 με) in the anterior and posterior neck, and compression (−2069 με) in the distal neck, respectively. Hip extensors and flexors generated the highest neck strain per unit of joint moment (63–67 με·m·N−1) at extreme hip angles. Therefore, femoral neck strain is heterogeneous and muscle contraction and posture dependent.

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“…The safety factors of our specimens remained above 1 ðSF Exp walking ¼ 4:6 and SF Exp running ¼ 2:4 for our weakest specimenÞ; that is, they likely would have been able to withstand the animal's weight during its daily activities despite the aggressiveness of the osteochondroplasty. Taddei et al [27] recently determined that the strain-based safety factor of intact human femurs during gait ranges from 1.196 to 15.558.…”

Section: Discussionmentioning

confidence: 99%

Head-Neck Osteoplasty has Minor Effect on the Strength of an Ovine Cam-FAI Model: In Vitro and Finite Element Analyses

Maquer

Bürki

Nuss

et al. 2016

Clinical Orthopaedics &Amp; Related Research

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Background Osteochondroplasty of the head-neck region is performed on patients with cam femoroacetabular impingement (FAI) without fully understanding its repercussion on the integrity of the femur. Cam-type FAI can be surgically and reproducibly induced in the ovine femur, which makes it suitable for studying corrective surgery in a consistent way. Finite element models built on quantitative CT (QCT) are computer tools that can be used to predict femoral strength and evaluate the mechanical effect of surgical correction. Questions/purposes We asked: (1) What is the effect of a resection of the superolateral aspect of the ovine femoral head-neck junction on failure load? (2) How does the failure load after osteochondroplasty compare with reported forces from activities of daily living in sheep? (3) How do failure loads and failure locations from the computer simulations compare with the experiments? Methods Osteochondroplasties (3, 6, 9 mm) were performed on one side of 18 ovine femoral pairs with the contralateral intact side as a control. The 36 femurs were scanned via QCT from which specimen-specific computer models were built. Destructive compression tests then were conducted experimentally using a servohydraulic testing system and numerically via the computer models. Safety factors were calculated as the ratio of the maximal force measured in vivo by telemeterized hip implants during the sheep's walking and running activities to the failure load. The simulated failure loads and failure locations from the computer models were compared with the experimental results. Results Failure loads were reduced by 5% (95% CI, 2%-8%) for the 3-mm group (p = 0.0089), 10% (95% CI, 6%-14%) for the 6-mm group (p = 0.0015), and 19% (95% CI, 13%-26%) for the 9-mm group (p = 0.0097) compared with the controls. Yet, the weakest specimen still supported more than 2.4 times the peak load during running. Strong correspondence was found between the simulated and experimental failure loads (R 2 = 0.83; p \ 0.001) and failure locations. Conclusions The resistance of ovine femurs to fracture decreased with deeper resections. However, under in vitro testing conditions, the effect on femoral strength remains small even after 9 mm correction, suggesting that femoral

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European Society of Biomechanics S.M. Perren Award 2014: Safety factor of the proximal femur during gait: A population-based finite element study

Cited by 24 publications

References 52 publications

Numerical Modelling of Femur Fracture and Experimental Validation Using Bone Simulant

Numerical Modelling of Femur Fracture and Experimental Validation Using Bone Simulant

Femoral Neck Strain during Maximal Contraction of Isolated Hip-Spanning Muscle Groups

Head-Neck Osteoplasty has Minor Effect on the Strength of an Ovine Cam-FAI Model: In Vitro and Finite Element Analyses

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