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Lerchl T, Nispel K, Baum T, Bodden J, Senner V, Kirschke JS. Multibody Models of the Thoracolumbar Spine: A Review on Applications, Limitations, and Challenges. Bioengineering (Basel) 2023; 10:bioengineering10020202. [PMID: 36829696 PMCID: PMC9952620 DOI: 10.3390/bioengineering10020202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 01/30/2023] [Accepted: 01/31/2023] [Indexed: 02/09/2023] Open
Abstract
Numerical models of the musculoskeletal system as investigative tools are an integral part of biomechanical and clinical research. While finite element modeling is primarily suitable for the examination of deformation states and internal stresses in flexible bodies, multibody modeling is based on the assumption of rigid bodies, that are connected via joints and flexible elements. This simplification allows the consideration of biomechanical systems from a holistic perspective and thus takes into account multiple influencing factors of mechanical loads. Being the source of major health issues worldwide, the human spine is subject to a variety of studies using these models to investigate and understand healthy and pathological biomechanics of the upper body. In this review, we summarize the current state-of-the-art literature on multibody models of the thoracolumbar spine and identify limitations and challenges related to current modeling approaches.
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Affiliation(s)
- Tanja Lerchl
- Sport Equipment and Sport Materials, School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
- Correspondence: ; Tel.: +49-89-289-15365
| | - Kati Nispel
- Sport Equipment and Sport Materials, School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Thomas Baum
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Jannis Bodden
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Veit Senner
- Sport Equipment and Sport Materials, School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany
| | - Jan S. Kirschke
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
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Kardash K, Koutras C, Otaduy MA. Design of personalized scoliosis braces based on differentiable biomechanics—Synthetic study. Front Bioeng Biotechnol 2022; 10:1014365. [DOI: 10.3389/fbioe.2022.1014365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 10/24/2022] [Indexed: 11/12/2022] Open
Abstract
This work describes a computational methodology for the design of braces for adolescent idiopathic scoliosis. The proposed methodology relies on a personalized simulation model of the patient’s trunk, and automatically searches for the brace geometry that optimizes the trade-off between clinical improvement and patient comfort. To do this, we introduce a formulation of differentiable biomechanics of the patient’s trunk, the brace, and their interaction. We design a simulation model that is differentiable with respect to both the deformation state and the brace design parameters, and we show how this differentiable model is used for the efficient update of brace design parameters within a numerical optimization algorithm. To evaluate the proposed methodology, we have obtained trunk models with personalized geometry for five patients of adolescent idiopathic scoliosis, and we have designed Boston-type braces. In a simulation setting, the designed braces improve clinical metrics by 45% on average, under acceptable comfort conditions. In the future, the methodology can be extended beyond synthetic validation, and tested with physical braces on the actual patients.
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Koutras C, Shayestehpour H, Pérez J, Wong C, Rasmussen J, Tournier M, Nesme M, Otaduy MA. Biomechanical Morphing for Personalized Fitting of Scoliotic Torso Skeleton Models. Front Bioeng Biotechnol 2022; 10:945461. [PMID: 35928945 PMCID: PMC9343806 DOI: 10.3389/fbioe.2022.945461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 06/23/2022] [Indexed: 11/22/2022] Open
Abstract
The use of patient-specific biomechanical models offers many opportunities in the treatment of adolescent idiopathic scoliosis, such as the design of personalized braces. The first step in the development of these patient-specific models is to fit the geometry of the torso skeleton to the patient’s anatomy. However, existing methods rely on high-quality imaging data. The exposure to radiation of these methods limits their applicability for regular monitoring of patients. We present a method to fit personalized models of the torso skeleton that takes as input biplanar low-dose radiographs. The method morphs a template to fit annotated points on visible portions of the spine, and it relies on a default biomechanical model of the torso for regularization and robust fitting of hardly visible parts of the torso skeleton, such as the rib cage. The proposed method provides an accurate and robust solution to obtain personalized models of the torso skeleton, which can be adopted as part of regular management of scoliosis patients. We have evaluated the method on ten young patients who participated in our study. We have analyzed and compared clinical metrics on the spine and the full torso skeleton, and we have found that the accuracy of the method is at least comparable to other methods that require more demanding imaging methods, while it offers superior robustness to artifacts such as interpenetration of ribs. Normal-dose X-rays were available for one of the patients, and for the other nine we acquired low-dose X-rays, allowing us to validate that the accuracy of the method persisted under less invasive imaging modalities.
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Affiliation(s)
- Christos Koutras
- Department of Computer Science, Universidad Rey Juan Carlos, Madrid, Spain
- *Correspondence: Christos Koutras,
| | - Hamed Shayestehpour
- Department of Materials and Production, Aalborg University, Aalborg, Denmark
| | - Jesús Pérez
- Department of Computer Science, Universidad Rey Juan Carlos, Madrid, Spain
| | - Christian Wong
- Orthopedics Department, University Hospital of Hvidovre, Hvidovre, Denmark
| | - John Rasmussen
- Department of Materials and Production, Aalborg University, Aalborg, Denmark
| | | | | | - Miguel A. Otaduy
- Department of Computer Science, Universidad Rey Juan Carlos, Madrid, Spain
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Lerchl T, El Husseini M, Bayat A, Sekuboyina A, Hermann L, Nispel K, Baum T, Löffler MT, Senner V, Kirschke JS. Validation of a Patient-Specific Musculoskeletal Model for Lumbar Load Estimation Generated by an Automated Pipeline From Whole Body CT. Front Bioeng Biotechnol 2022; 10:862804. [PMID: 35898642 PMCID: PMC9309792 DOI: 10.3389/fbioe.2022.862804] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 05/20/2022] [Indexed: 01/07/2023] Open
Abstract
Background: Chronic back pain is a major health problem worldwide. Although its causes can be diverse, biomechanical factors leading to spinal degeneration are considered a central issue. Numerical biomechanical models can identify critical factors and, thus, help predict impending spinal degeneration. However, spinal biomechanics are subject to significant interindividual variations. Therefore, in order to achieve meaningful findings on potential pathologies, predictive models have to take into account individual characteristics. To make these highly individualized models suitable for systematic studies on spinal biomechanics and clinical practice, the automation of data processing and modeling itself is inevitable. The purpose of this study was to validate an automatically generated patient-specific musculoskeletal model of the spine simulating static loading tasks. Methods: CT imaging data from two patients with non-degenerative spines were processed using an automated deep learning-based segmentation pipeline. In a semi-automated process with minimal user interaction, we generated patient-specific musculoskeletal models and simulated various static loading tasks. To validate the model, calculated vertebral loadings of the lumbar spine and muscle forces were compared with in vivo data from the literature. Finally, results from both models were compared to assess the potential of our process for interindividual analysis. Results: Calculated vertebral loads and muscle activation overall stood in close correlation with data from the literature. Compression forces normalized to upright standing deviated by a maximum of 16% for flexion and 33% for lifting tasks. Interindividual comparison of compression, as well as lateral and anterior–posterior shear forces, could be linked plausibly to individual spinal alignment and bodyweight. Conclusion: We developed a method to generate patient-specific musculoskeletal models of the lumbar spine. The models were able to calculate loads of the lumbar spine for static activities with respect to individual biomechanical properties, such as spinal alignment, bodyweight distribution, and ligament and muscle insertion points. The process is automated to a large extent, which makes it suitable for systematic investigation of spinal biomechanics in large datasets.
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Affiliation(s)
- Tanja Lerchl
- Associate Professorship of Sport Equipment and Sport Materials, School of Engineering and Design, Technical University of Munich, Munich, Germany
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
- *Correspondence: Tanja Lerchl,
| | - Malek El Husseini
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Amirhossein Bayat
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
- Department of Informatics, Technical University of Munich, Munich, Germany
| | - Anjany Sekuboyina
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Luis Hermann
- Associate Professorship of Sport Equipment and Sport Materials, School of Engineering and Design, Technical University of Munich, Munich, Germany
| | - Kati Nispel
- Associate Professorship of Sport Equipment and Sport Materials, School of Engineering and Design, Technical University of Munich, Munich, Germany
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Thomas Baum
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
| | - Maximilian T. Löffler
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
- Department of Diagnostic and Interventional Radiology, University Medical Center Freiburg, Freiburg im Breisgau, Germany
| | - Veit Senner
- Associate Professorship of Sport Equipment and Sport Materials, School of Engineering and Design, Technical University of Munich, Munich, Germany
| | - Jan S. Kirschke
- Department of Diagnostic and Interventional Neuroradiology, School of Medicine, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
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Wei W, Zhang T, Huang Z, Yang J. Finite element analysis in brace treatment on adolescent idiopathic scoliosis. Med Biol Eng Comput 2022; 60:907-920. [DOI: 10.1007/s11517-022-02524-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 01/30/2022] [Indexed: 10/19/2022]
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Lopez Poncelas M, La Barbera L, Rawlinson JJ, Crandall D, Aubin CE. Credibility assessment of patient-specific biomechanical models to investigate proximal junctional failure in clinical cases with adult spine deformity using ASME V&V40 standard. Comput Methods Biomech Biomed Engin 2021; 25:543-553. [PMID: 34427119 DOI: 10.1080/10255842.2021.1968380] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Computational models are increasingly used to assess spine biomechanics and support surgical planning. However, varying levels of model verification and validation, along with characterization of uncertainty effects limit the level of confidence in their predictive potential. The objective was to assess the credibility of an adult spine deformity instrumentation model for proximal junction failure (PJF) analysis using the ASME V&V40:2018 framework. To assess model applicability, the surgery, erected posture, and flexion movement of actual clinical cases were simulated. The loads corresponding to PJF indicators for a group of asymptomatic patients and a group of PJF patients were compared. Model consistency was demonstrated by finding PJF indicators significantly higher for the simulated PJF vs. asymptomatic patients. A detailed sensitivity analysis and uncertainty quantification were performed to further establish the model credibility.
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Affiliation(s)
- M Lopez Poncelas
- Department of Mechanical Engineering, Polytechnique Montréal, Montréal, Quebec, Canada.,Research Center, Sainte-Justine University Hospital Center, Montréal, Quebec, Canada
| | - L La Barbera
- Department of Mechanical Engineering, Polytechnique Montréal, Montréal, Quebec, Canada.,Research Center, Sainte-Justine University Hospital Center, Montréal, Quebec, Canada.,Department of Chemistry and Chemical Engineering, Politecnico di Milano, Milano, Italy
| | - J J Rawlinson
- Department of Mechanical Engineering, Polytechnique Montréal, Montréal, Quebec, Canada.,Applied Research, Medtronic Spine, Memphis, TN, USA
| | - D Crandall
- Sonoran Spine Center, Tempe, AZ, USA.,Mayo Clinic School of Medicine, Phoenix, AZ, USA.,School of Medicine, University of Arizona, Phoenix, AZ, USA
| | - C E Aubin
- Department of Mechanical Engineering, Polytechnique Montréal, Montréal, Quebec, Canada.,Research Center, Sainte-Justine University Hospital Center, Montréal, Quebec, Canada
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Koutras C, Pérez J, Kardash K, Otaduy MA. A study of the sensitivity of biomechanical models of the spine for scoliosis brace design. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2021; 207:106125. [PMID: 34020374 DOI: 10.1016/j.cmpb.2021.106125] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 04/19/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND AND OBJECTIVE The development of biomechanical models of the torso and the spine opens the door to computational solutions for the design of braces for adolescent idiopathic scoliosis. However, the design of such biomechanical models faces several unknowns, such as the correct identification of relevant mechanical elements, or the required accuracy of model parameters. The objective of this study was to design a methodology for the identification of the aforementioned elements, with the purpose of creating personalized models suited for patient-specific brace design and the definition of parameter estimation criteria. METHODS We have developed a comprehensive model of the torso, including spine, ribcage and soft tissue, and we have developed computational tools for the analysis of the model parameters. With these tools, we perform an analysis of the model under typical loading conditions of scoliosis braces. RESULTS We present a complete sensitivity analysis of the models mechanical parameters and a comparison between a reference healthy subject and a subject suffering from scoliosis. Furthermore, we make a direct connection between error bounds on the deformation and tolerances for parameter estimation, which can guide the personalization of the model. CONCLUSIONS Not surprisingly, the stiffness parameters that govern the lateral deformation of the spine in the frontal plane are some of the most relevant parameters, and require careful modeling. More surprisingly, their relevance is on par with the correct parameterization of the soft tissue of the torso. For scoliosis patients, but not for healthy subjects, we observe that the axial rotation of the spine also requires careful modeling.
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Affiliation(s)
| | - Jesús Pérez
- Universidad Rey Juan Carlos, Madrid, 28933, Spain.
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Influence of Chêneau-Brace Therapy on Lumbar and Thoracic Spine and Its Interdependency with Cervical Spine Alignment in Patients with Adolescent Idiopathic Scoliosis (AIS). J Clin Med 2021; 10:jcm10091849. [PMID: 33922845 PMCID: PMC8123053 DOI: 10.3390/jcm10091849] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/05/2021] [Accepted: 04/13/2021] [Indexed: 11/16/2022] Open
Abstract
Chêneau-brace is an effective therapy tool for treatment in adolescent idiopathic scoliosis (AIS). Data on potential interdependent changes of the sagittal profile including the cervical spine are still sparse. The purpose of this study was to evaluate in-brace changes of the thoracic and lumbar spine and their influence on the pelvis and the cervical spine and apical vertebral rotation was reported. Ninety-three patients with AIS undergoing Chêneau-bracing were included. Patients were stratified by lumbar, thoracic and global spine alignment into normolordotic vs. hyperlordotic or normokyphotic vs. hypokyphotic or anteriorly aligned vs. posteriorly aligned groups. The coronal Cobb angle was significantly decreased in all groups indicating good correction while in-brace therapy. Sagittally, in-brace treatment led to significant flattening of lumbar lordosis (LL) in all stratified groups. Thoracic kyphosis (TK) was significantly flattened in the normokyphotic group, but no TK changes were noticed in the hypokyphotic group. Pelvic tilt (PT) stayed unchanged during the in-brace therapy. Chêneau-brace showed marginal changes in the lower cervical spine but had no influence on the upper cervical spine. The apical vertebral axis in primary and secondary curves was unchanged during the first radiological follow-up. Results from this study contribute to better understanding of initial spine behavior in sagittal and axial plane in the context of bracing.
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Braces Designed Using CAD/CAM Combined or Not With Finite Element Modeling Lead to Effective Treatment and Quality of Life After 2 Years: A Randomized Controlled Trial. Spine (Phila Pa 1976) 2021; 46:9-16. [PMID: 32991513 DOI: 10.1097/brs.0000000000003705] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
STUDY DESIGN Single-center prospective randomized controlled trial. OBJECTIVE The aim of this study was to assess the computer-aided design/manufacturing (CAD/CAM) brace design approach, with and without added finite element modeling (FEM) simulations, after 2 years in terms of clinical outcomes, 3D correction, compliance, and quality of life (QoL). SUMMARY OF BACKGROUND DATA .: Previous studies demonstrated that braces designed using a combination of CAD/CAM and FEM induced promising in-brace corrections, were lighter, thinner, and covered less trunk surface. Yet, their long-term impact on treatment quality has not been evaluated. METHODS One-hundred twenty adolescent idiopathic scoliosis patients were recruited following Scoliosis Research Society standardized criteria for brace treatment; 61 patients in the first subgroup (CAD) were given braces designed using CAD/CAM; 59 in the second subgroup (CAD-FEM) received braces additionally simulated and refined using a patient-specific FEM built from 3D reconstructions of the spine, rib cage and pelvis. Main thoracic (MT) and thoraco-lumbar/lumbar (TL/L) Cobb angles, sagittal curves, and apical rotations were compared at the initial visit and after 2 years. Patient compliance and QoL were tracked respectively by using embedded temperature sensors and SRS-22r questionnaires. RESULTS Forty-four patients with CAD-FEM braces and 50 with CAD braces completed the study. Average in-brace correction was 9° MT (8° CAD-FEM, 10° CAD, P = 0.054) and 12° TL/L (same for both subgroups, P = 0.91). Out-of-brace 2-year progression from initial deformity was <4° for all 3D measurements. Sixty-six percent of all cases (30 CAD-FEM, 35 CAD) met the ≤5° curve progression criterion, 83% (38 CAD-FEM, 43 CAD) stayed <45°, and 6% (5 CAD-FEM, 1 CAD) underwent fusion surgery. 3D correction, compliance, and QoL were not significantly different between both subgroups (P > 0.05). CONCLUSION After 2 years, patients with braces designed using CAD/CAM with/without FEM had satisfying clinical outcomes (compared to the BrAIST study), 3D corrections, compliance and QoL. A more comprehensive optimization of brace treatment remains to be accomplished. LEVEL OF EVIDENCE 2.
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Vergari C, Chen Z, Robichon L, Courtois I, Ebermeyer E, Vialle R, Langlais T, Pietton R, Skalli W. Towards a predictive simulation of brace action in adolescent idiopathic scoliosis. Comput Methods Biomech Biomed Engin 2020; 24:874-882. [PMID: 33295806 DOI: 10.1080/10255842.2020.1856373] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Bracing is the most common treatment to stop the progression of adolescent idiopathic scoliosis. Finite element modeling could help improve brace design, but model validation is still a challenge. In this work, the clinical relevance of a predictive and subject-specific model for bracing was evaluated in forty-six AIS patients. The model reproduces brace action and the patient's spinopelvic adjustments to keep balance. The model simulated 70% or more patients with geometrical parameters within a preselected tolerance level. Although the model simulation of the sagittal plane could be improved, the approach is promising for a realistic and predictive simulation of brace action.
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Affiliation(s)
- Claudio Vergari
- Arts et Métiers Institute of Technology, Université Sorbonne Paris Nord, IBHGC - Institut de Biomécanique Humaine Georges Charpak, HESAM Université, F-75013, Paris
| | - Zhuowei Chen
- Arts et Métiers Institute of Technology, Université Sorbonne Paris Nord, IBHGC - Institut de Biomécanique Humaine Georges Charpak, HESAM Université, F-75013, Paris
| | - Léopold Robichon
- Arts et Métiers Institute of Technology, Université Sorbonne Paris Nord, IBHGC - Institut de Biomécanique Humaine Georges Charpak, HESAM Université, F-75013, Paris
| | | | - Eric Ebermeyer
- CHU - Hôpital Bellevue, Unité Rachis, Saint-Etienne, France
| | - Raphaël Vialle
- Department of Pediatric Orthopaedics, Sorbonne Université, Hôpital Armand Trousseau, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
| | - Tristan Langlais
- Department of Pediatric Orthopaedics, Sorbonne Université, Hôpital Armand Trousseau, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
| | - Raphaël Pietton
- Department of Pediatric Orthopaedics, Sorbonne Université, Hôpital Armand Trousseau, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
| | - Wafa Skalli
- Arts et Métiers Institute of Technology, Université Sorbonne Paris Nord, IBHGC - Institut de Biomécanique Humaine Georges Charpak, HESAM Université, F-75013, Paris
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Chung CL, Kelly DM, Steele JR, DiAngelo DJ. A mechanical analog thoracolumbar spine model for the evaluation of scoliosis bracing technology. J Rehabil Assist Technol Eng 2019; 5:2055668318809661. [PMID: 31191960 PMCID: PMC6531798 DOI: 10.1177/2055668318809661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Accepted: 10/02/2018] [Indexed: 11/16/2022] Open
Abstract
Introduction Thoracolumbar braces are used to treat Adolescent Idiopathic Scoliosis. The
objective of this study was to design and validate a mechanical analog model
of the spine to simulate a thoracolumbar, single-curve, scoliotic deformity
in order to quantify brace structural properties and corrective force
response on the spine. Methods The Scoliosis Analog Model used a linkage-based system to replicate 3D
kinematics of spinal correction observed in the clinic. The Scoliosis Analog
Model is used with a robotic testing platform and programmed to simulate
Cobb angle and axial rotation correction while equipped with a brace. The 3D
force and moment responses generated by the brace in reaction to the
simulated deformity were measured by six-axis load cells. Results Validation of the model’s force transmission showed less than 6% loss in the
force analysis due to assembly friction. During simulation of 10° Cobb angle
and 5° axial rotation correction, the brace applied 101 N upwards and 67 N
inwards to the apical connector of the model. Brace stiffness properties
were 0.5–0.6 N/° (anteroposterior), 0.5–2.3 N/° (mediolateral), 23.3–26.5
N/° (superoinferior), and 0.6 Nm/° (axial rotational). Conclusions The Scoliosis Analog Model was developed to provide first time measures of
the multidirectional forces applied to the spine by a thoracolumbar brace.
This test assembly could be used as a future design and testing tool for
scoliosis brace technology.
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Affiliation(s)
- Chloe L Chung
- Department of Orthopaedic Surgery and Biomedical Engineering, The University of Tennessee Health Science Center, Memphis, USA
| | - Derek M Kelly
- Campbell Clinic Orthopaedics and Le Bonheur Children's Hospital, Memphis, USA
| | - Jack R Steele
- The Center for Orthotics and Prosthetics, Inc., Memphis, USA
| | - Denis J DiAngelo
- Department of Orthopaedic Surgery and Biomedical Engineering, The University of Tennessee Health Science Center, Memphis, USA
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Courvoisier A, Nesme M, Gerbelot J, Moreau-Gaudry A, Faure F. Prediction of brace effect in scoliotic patients: blinded evaluation of a novel brace simulator—an observational cross-sectional study. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2019; 28:1277-1285. [DOI: 10.1007/s00586-019-05948-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 02/08/2019] [Accepted: 03/08/2019] [Indexed: 10/27/2022]
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Vergari C, Aubert B, Lallemant-Dudek P, Haen TX, Skalli W. A novel method of anatomical landmark selection for rib cage 3D reconstruction from biplanar radiography. COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING-IMAGING AND VISUALIZATION 2018. [DOI: 10.1080/21681163.2018.1537860] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Claudio Vergari
- Arts et Metiers ParisTech, LBM/Institut de Biomecanique Humaine Georges Charpak, Paris, France
| | - Benjamin Aubert
- Arts et Metiers ParisTech, LBM/Institut de Biomecanique Humaine Georges Charpak, Paris, France
| | | | - Thomas-Xavier Haen
- Arts et Metiers ParisTech, LBM/Institut de Biomecanique Humaine Georges Charpak, Paris, France
- Ramsay Générale de Santé, Clinique Jouvenet, Paris, France
| | - Wafa Skalli
- Arts et Metiers ParisTech, LBM/Institut de Biomecanique Humaine Georges Charpak, Paris, France
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Porcine spine finite element model: a complementary tool to experimental scoliosis fusionless instrumentation. EUROPEAN SPINE JOURNAL : OFFICIAL PUBLICATION OF THE EUROPEAN SPINE SOCIETY, THE EUROPEAN SPINAL DEFORMITY SOCIETY, AND THE EUROPEAN SECTION OF THE CERVICAL SPINE RESEARCH SOCIETY 2017; 26:1610-1617. [DOI: 10.1007/s00586-016-4940-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 12/21/2016] [Accepted: 12/25/2016] [Indexed: 10/20/2022]
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