Computer aided design and evaluation of new anatomic fixation system on entire pelvic model

Liao, Shenghui; Tong, Ruofeng; Tang, Min

doi:10.1145/1629255.1629299

Cited by 5 publications

(9 citation statements)

References 19 publications

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“…Many FE studies have dealt with the pelvis, mainly investigating the stability of fixation systems, plates, or screws, but mostly these have not taken muscles into account: with the ends of femur or the acetabula fixed, a single force is applied to the upper sacrum. It could be questioned whether those boundary conditions sufficiently reflect physiological loadings and hence whether the clinical relevance is adequate.…”

Section: Discussionmentioning

confidence: 99%

“…By applying those loadings from muscles to realistic insertion areas of muscles in the FE model, a state of equilibrium is achieved with a spherical ball joint at the lumbosacral joint location. This was done to take into account physiological loadings and therefore avoid fixing parts of the model as is often done in literature by applying single forces in a range of 500–600 N, thereby inducing local stresses. Here, only two sets of springs are inserted for numerical convergence purposes, the forces of which are negligible compared to the sum total of forces applied, also proving the realism of the current approach.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

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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“…As used in pelvic FE models, the cancellous bone core was modelled as solid elements using 3D (four-noded) tetrahedral elements and a 2D triangular 2-mm-thick shell elements which overlays the solid elements to represent cortical bone of the pelvis. 14–16…”

Section: Fe Analysismentioning

confidence: 99%

Structural health monitoring: An orthopaedic perspective

Wong

Chiu

Russ

et al. 2015

Structural Health Monitoring

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Having unstable sacral fractures requires patients to be bedridden for a significant period of time for healing to take place without complications. This causes severe muscle atrophy, along with blood circulation problems in older patients. It is therefore highly beneficial to fast-track weight-bearing activities to reduce these complications by monitoring the recovery of the fracture. Past experimental work shows that dynamic response of a fixated synthetic (fourth-generation composite sawbone) pelvis is affected by the change in stiffness at the fracture location. The changes in this dynamic response can be observed by placing sensors on the pelvis and on the fixation. However, placing sensors on the pelvis is not practical. The aim of this article is to report on a set of computational investigation on the potential of placing sensors on the fixation to determine the stiffness restoration of the fractured region of the pelvis. This work will focus on the Denis I fracture, where the fracture is located in the sacrum. The ability to relate the dynamic response of a particular section of the fixation that is remote to the fracture location will have significant implication in the extending structural health monitoring concept to determine the state of healing of a fractured pelvis. A fourth-generation composite sawbone pelvis was used in the work reported in this article.

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“…However, regardless of the application focus, one of the mandatory steps to be completed resides in fast and precise geometric reconstruction of the analyzed anatomical features of the human body, whose dimensions broadly vary since dental, 2 osseous 3–6 or even full body modeling might be necessary. 7 While soft tissues could be part of the developed geometric representation, 7 numerous research studies focus exclusively on bone geometry.…”

Section: Introductionmentioning

confidence: 99%

“…This form of computer-aided representation has begun to play an increasingly important role in numerous biomedical applications focused on design and fabrication of the artificial human tissue replacements, manufacturing of the prosthetic implants and fixation systems and preoperative surgical planning. 1 However, regardless of the application focus, one of the mandatory steps to be completed resides in fast and precise geometric reconstruction of the analyzed anatomical features of the human body, whose dimensions broadly vary since dental, 2 osseous [3][4][5][6] or even full body modeling might be necessary. 7 While soft tissues could be part of the developed geometric representation, 7 numerous research studies focus exclusively on bone geometry.…”

Section: Introductionmentioning

confidence: 99%

Automatic and accurate reconstruction of distal humerus contours through B-Spline fitting based on control polygon deformation

Mostafavi

Tutunea‐Fatan

Bordatchev

et al. 2014

Proc Inst Mech Eng H

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The strong advent of computer-assisted technologies experienced by the modern orthopedic surgery prompts for the expansion of computationally efficient techniques to be built on the broad base of computer-aided engineering tools that are readily available. However, one of the common challenges faced during the current developmental phase continues to remain the lack of reliable frameworks to allow a fast and precise conversion of the anatomical information acquired through computer tomography to a format that is acceptable to computer-aided engineering software. To address this, this study proposes an integrated and automatic framework capable to extract and then postprocess the original imaging data to a common planar and closed B-Spline representation. The core of the developed platform relies on the approximation of the discrete computer tomography data by means of an original two-step B-Spline fitting technique based on successive deformations of the control polygon. In addition to its rapidity and robustness, the developed fitting technique was validated to produce accurate representations that do not deviate by more than 0.2 mm with respect to alternate representations of the bone geometry that were obtained through different-contact-based-data acquisition or data processing methods.

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Computer aided design and evaluation of new anatomic fixation system on entire pelvic model

Cited by 5 publications

References 19 publications

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

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

Structural health monitoring: An orthopaedic perspective

Automatic and accurate reconstruction of distal humerus contours through B-Spline fitting based on control polygon deformation

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