Stress in Human Pelvis throughout the Gait Cycle: Development, Evaluation and Sensitivity Studies of a Finite Element Model

Ravera, Emiliano Pablo; Crespo, Marcos; Guarnieri, Fabio Ariel; Braidot, Ariel

doi:10.1007/978-3-319-13117-7_64

Cited by 10 publications

(11 citation statements)

References 20 publications

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“…This figure shows the stress distribution during walking for each structure of the FE model, that is, femoral cartilage, acetabular cartilage and pelvic bone. Comparing the results with those of a previous study, 65 the introduction of muscular boundary conditions and the flexion-extension movement of the hip reduce the regions of high stress and distributed better Figure 6. Total hip load contact force obtained by rigid-body musculoskeletal model and FE model during stance phase.…”

Section: Resultssupporting

confidence: 58%

A subject-specific integrative biomechanical framework of the pelvis for gait analysis

Ravera

Crespo

Formento

2018

Proc Inst Mech Eng H

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Analysis of the human locomotor system using rigid-body musculoskeletal models has increased in the biomechanical community with the objective of studying muscle activations of different movements. Simultaneously, the finite element method has emerged as a complementary approach for analyzing the mechanical behavior of tissues. This study presents an integrative biomechanical framework for gait analysis by linking a musculoskeletal model and a subject-specific finite element model of the pelvis. To investigate its performance, a convergence study was performed and its sensitivity to the use of non-subject-specific material properties was studied. The total hip joint force estimated by the rigid musculoskeletal model and by the finite element model showed good agreement, suggesting that the integrative approach estimates adequately (in shape and magnitude) the hip total contact force. Previous studies found movements of up to 1.4 mm in the anterior-posterior direction, for single leg stance. These results are comparable with the displacement values found in this study: 0-0.5 mm in the sagittal axis. Maximum von Mises stress values of approximately 17 MPa were found in the pelvic bone. Comparing this results with a previous study of our group, the new findings show that the introduction of muscular boundary conditions and the flexion-extension movement of the hip reduce the regions of high stress and distributes more uniformly the stress across the pelvic bone. Thus, it is thought that muscle force has a relevant impact in reducing stresses in pelvic bone during walking of the finite element model proposed in this study. Future work will focus on including other deformable structures, such as the femur and the tibia, and subject-specific material properties.

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Section: Resultssupporting

confidence: 58%

A subject-specific integrative biomechanical framework of the pelvis for gait analysis

Ravera

Crespo

Formento

2018

Proc Inst Mech Eng H

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“…In addition, no distinction between cortical and spongious bones was included, as it is believed that it would not significantly change the distribution of stresses, but only the absolute magnitudes of stress values. Consequently, bones were considered as a single material with averaged mechanical properties . In addition, a decision was made not to consider exactly the same geometry between the studies, that is, inverse dynamics and FE analysis, in order to not alter the preliminary validated male musculoskeletal model used in AnyBody .…”

Section: Discussionmentioning

confidence: 99%

“…Table illustrates the size of the quadratic tetrahedral elements obtained by means of a patch independent algorithm for each component together with the linear elastic isotropic mechanical properties (Young modulus E and Poisson ratio ν ) used. An averaged Young modulus E was used for the bones instead of separately modelling cortical and cancellous portions, since the focus of the study is on the global load distribution within the bone structures rather than the threshold values of stresses.…”

Section: Methodsmentioning

confidence: 99%

Influence of pubic symphysis stiffness on pelvic load distribution during single leg stance

Ricci

Maas

Gerich

et al. 2020

Numer Methods Biomed Eng

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This study focuses on the influence of the softening and stiffening of pubic symphysis on the load distribution within the bones of the pelvic ring under the physiological loadings of the single leg stance. Muscle forces and joint reaction forces were first determined by inverse dynamics and applied to a linear finite element model of the pelvis. With normal pubic symphysis stiffness, high Von Mises stresses are located on the anterior surface to the sacrum around the sacroiliac joint and on the superior ramus, both on the side of the weightbearing leg. Softening of the pubic symphysis redirects the load backward, decreases the stresses at the anterior pelvis, and increases them at the posterior pelvis. A stiffening of the pubic symphysis redirects the load forward, increases the load on the posterior pelvis, and decreases them at the anterior pelvis. This investigation highlights the significance of the pubic symphysis on the load distribution of the pelvis and in maintaining the integrity of the structures. Its role should not be neglected when analyzing the pelvis. K E Y W O R D Sfinite element analysis, inverse dynamics, load distribution analysis, physiological loadings, pubic symphysis stiffness, single leg stance

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“…Ravera et al [22] reported that sensitivity values for the models suggests that finite element predicted stress were not very sensitive to changes in the material properties assumed in their model for cartilage and bone.…”

Section: Resultsmentioning

confidence: 99%

Finite Element Analysis of Stress Distribution in Normal and Osteoporosis Pelvis Models

Veliceasa¹,

Alexa²,

Sîrbu³

et al. 2019

Mat.Plast.

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Finite element analysis is the most commonly used methods in orthopedic biomechanical research. The study aims at improving the common understanding of the behavior of the pelvis and the biomechanics of the pelvic ring in a healthy and osteoporosis configuration. We performed a finite element analysis using the ANSYS program. The study mainly focused on bones and the joints and the complex modelling of the ligaments was ignored. The results of our study showed that the stress distribution of the pelvis with osteoporosis was changed compared with normal pelvis. In addition to, in the healthy bone, where the maximum stress values are concentrated around the obturator foramen (anterior arch of the pelvic ring), in the osteoporotic bone, the maximum stress also appear at the posterior arch of the pelvic ring (especially in the sacrum.

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Stress in Human Pelvis throughout the Gait Cycle: Development, Evaluation and Sensitivity Studies of a Finite Element Model

Cited by 10 publications

References 20 publications

A subject-specific integrative biomechanical framework of the pelvis for gait analysis

A subject-specific integrative biomechanical framework of the pelvis for gait analysis

Influence of pubic symphysis stiffness on pelvic load distribution during single leg stance

Finite Element Analysis of Stress Distribution in Normal and Osteoporosis Pelvis Models

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