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He KH, Bruse JL, Rodriguez-Florez N, Dunaway D, Jeelani O, Schievano S, Borghi A. Understanding the influence of surgical parameters on craniofacial surgery outcomes: a computational study. ROYAL SOCIETY OPEN SCIENCE 2024; 11:231158. [PMID: 38577216 PMCID: PMC10987985 DOI: 10.1098/rsos.231158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 11/03/2023] [Accepted: 01/29/2024] [Indexed: 04/06/2024]
Abstract
Sagittal craniosynostosis (SC) is a congenital condition whereby the newborn skull develops abnormally owing to the premature ossification of the sagittal suture. Spring-assisted cranioplasty (SAC) is a minimally invasive surgical technique to treat SC, where metallic distractors are used to reshape the newborn's head. Although safe and effective, SAC outcomes remain uncertain owing to the limited understanding of skull-distractor interaction and the limited information provided by the analysis of single surgical cases. In this work, an SC population-averaged skull model was created and used to simulate spring insertion by means of the finite-element analysis using a previously developed modelling framework. Surgical parameters were varied to assess the effect of osteotomy and spring positioning, as well as distractor combinations, on the final skull dimensions. Simulation trends were compared with retrospective measurements from clinical imaging (X-ray and three-dimensional photogrammetry scans). It was found that the on-table post-implantation head shape change is more sensitive to spring stiffness than to the other surgical parameters. However, the overall end-of-treatment head shape is more sensitive to spring positioning and osteotomy size parameters. The results of this work suggest that SAC surgical planning should be performed in view of long-term results, rather than immediate on-table reshaping outcomes.
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Affiliation(s)
- K. H. He
- Ningbo University, Ningbo, People's Republic of China
- Great Ormond Street Institute of Child Health, University College London, London, UK
| | - J. L. Bruse
- Vicomtech Foundation, Basque Research and Technology Alliance (BRTA), San Sebastian, Spain
| | - N. Rodriguez-Florez
- Universidad de Navarra, TECNUN Escuela de Ingenieros, San Sebastian, Spain
- Ikerbasque, Basque Foundation for Science, Bilbao, Spain
| | - D. Dunaway
- Great Ormond Street Institute of Child Health, University College London, London, UK
- Craniofacial Unit, Great Ormond Street Hospital for Children, London, UK
| | - O. Jeelani
- Great Ormond Street Institute of Child Health, University College London, London, UK
- Craniofacial Unit, Great Ormond Street Hospital for Children, London, UK
| | - S. Schievano
- Great Ormond Street Institute of Child Health, University College London, London, UK
- Institute of Cardiovascular Science, University College London, London, UK
- Craniofacial Unit, Great Ormond Street Hospital for Children, London, UK
| | - A. Borghi
- Great Ormond Street Institute of Child Health, University College London, London, UK
- Craniofacial Unit, Great Ormond Street Hospital for Children, London, UK
- Department of Engineering, Durham University, Durham, UK
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Skadorwa T, Skadorwa J, Wierzbieniec O. The Accuracy of Classification Systems in Nonsyndromic Sagittal Craniosynostosis. J Craniofac Surg 2024; 35:13-17. [PMID: 37639642 PMCID: PMC10749678 DOI: 10.1097/scs.0000000000009670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 06/28/2023] [Indexed: 08/31/2023] Open
Abstract
Numerous classification systems of nonsyndromic sagittal craniosynostosis (NSC) are applied but none has gained a wide acceptance, since each classification is focused on distinct aspects. The aim of the study was to assess the accuracy of 4 classifications of NSC discussed in the literature by defining the associations among the classifications, individual features (sex, age, cranial index), and objective morphologic criteria (frontal bossing, retrocoronal constriction, sagittal ridge, and occipital bulleting). The study was conducted on anonymized thin-cut CT scans of 133 children with NSC 1 to 12 months old (mean age 5.42 mo). The type of cranial dysmorphology was assessed using 4 classification systems, focusing on skull shape, pattern of sagittal suture closure (Heuzé classification), deformation of skull vault (Sakamoto classification), and a single-dominant feature (David classification). Each patient was also independently investigated for the presence of morphologic criteria. A multivariate analysis was performed to explore the relations among the classifications and assess their accuracy. In the analyzed cohort sphenocephaly (38.3%), CFF type by Heuzé (30.8%), type I by Sakamoto (72.9%), and a central type by David (42.9%) were dominant findings. Regarding the morphologic criteria, frontal bossing was observed the most frequently (91.7%). The age of patients and cranial index differed significantly among the shapes of skull and David classifications ( P <0.001). The shape-based system showed the strongest correlation with other classifications and with measurable variables. Other classifications have much in common and some overlap, but none of them constitutes a standalone system to define all aspects of cranial dysmorphology in NSC.
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Affiliation(s)
- Tymon Skadorwa
- Department of Pediatric Neurosurgery, Bogdanowicz Memorial Hospital for Children
- Department of Descriptive and Clinical Anatomy, The Medical University of Warsaw
| | | | - Olga Wierzbieniec
- Department of Descriptive and Clinical Anatomy, The Medical University of Warsaw
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Skadorwa T, Wierzbieniec O, Sośnicka K, Podkowa K. Radiomorphologic profiles of nonsyndromic sagittal craniosynostosis. Childs Nerv Syst 2023; 39:3225-3233. [PMID: 37243812 PMCID: PMC10643241 DOI: 10.1007/s00381-023-05998-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2023] [Accepted: 05/18/2023] [Indexed: 05/29/2023]
Abstract
PURPOSE Numerous classification systems of nonsyndromic sagittal craniosynostosis (NSC) are applied but none has gained a wide acceptance, since each classification is focused on distinct aspects of cranial dysmorphology. The goal of this study was to depict the most common combinations of radiomorphologic characteristics of NSC and to separate groups where the patients were morphologically similar to one another and at the same time significantly different from others. METHODS The study was conducted on anonymized thin-cut CT scans of 131 children with NSC aged 1-12 months (mean age 5.42 months). The type of cranial dysmorphology was assessed using four criteria: skull shape, pattern of sagittal suture fusion, morphologic features and cerebrospinal fluid (CSF) spaces alterations. After assigning the categories, an unsupervised k-modes clustering algorithm was applied to identify distinct patients clusters representing radiomorphologic profiles determined by investigated characteristics. RESULTS Cluster analysis revealed three distinct radiomorphologic profiles including the most common combinations of features. The profiles were not influenced by sex nor age but were significantly determined by skull shape (V = 0.58, P < 0.0001), morphologic features (V = 0.50, P < 0.0001) and pattern of sagittal suture fusion (V = 0.47, P < 0.0001). CSF alterations did not significantly correlate with the profiles (P = 0.3585). CONCLUSION NSC is a mosaic of radiologic and morphologic features. The internal diversity of NSC results in dissimilar groups of patients defined by unique combinations of radiomorphologic characteristics, from which the skull shape is the most differentiating factor. Radiomorphologic profiles support the idea of clinical trials targeted at more selective outcomes assessment.
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Affiliation(s)
- Tymon Skadorwa
- Department of Pediatric Neurosurgery, Bogdanowicz Memorial Hospital for Children, 4/24 Nieklanska St, 03924, Warsaw, Poland.
- Department of Descriptive and Clinical Anatomy, The Medical University of Warsaw, 5 Chalubinskiego St, 02004, Warsaw, Poland.
| | - Olga Wierzbieniec
- Department of Descriptive and Clinical Anatomy, The Medical University of Warsaw, 5 Chalubinskiego St, 02004, Warsaw, Poland
| | - Kamila Sośnicka
- Department of Descriptive and Clinical Anatomy, The Medical University of Warsaw, 5 Chalubinskiego St, 02004, Warsaw, Poland
| | - Klaudia Podkowa
- Department of Descriptive and Clinical Anatomy, The Medical University of Warsaw, 5 Chalubinskiego St, 02004, Warsaw, Poland
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Grove AM, Kirsch HM, Kurnik NM, Bristol RE, Sitzman TJ, Pfeifer C, Singh DJ. Preoperative Frontal and Parietal Bone Thickness Assessment to Predict Blood Loss and Transfusion During Extended Suturectomy for Isolated Sagittal Craniosynostosis. Cleft Palate Craniofac J 2023:10556656231202840. [PMID: 37710993 DOI: 10.1177/10556656231202840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/16/2023] Open
Abstract
OBJECTIVE To predict the morbidity of sagittal suturectomy using preoperative computer tomographic measurement of frontal and parietal bone thickness in osteotomy sites. DESIGN Retrospective analysis. SETTING Tertiary children's hospital. PATIENTS Fifty infants with nonsyndromic, isolated sagittal craniosynostosis who underwent extended sagittal suturectomy from 2015-2022. METHODS Mean thickness of the frontal and parietal bone in regions of osteotomies were determined for each patient from preoperative CT images obtained within 30 days prior to suturectomy. The relationship between bone thickness (mm) and estimated blood loss (mL) was evaluated using Spearman's correlation and a multivariable model that adjusted for patient weight and surgery duration. The association between bone thickness and perioperative blood transfusion was evaluated using a multivariable logistic model controlling for patient weight and surgery duration. MAIN OUTCOME MEASURES Estimated blood loss, perioperative blood transfusion. RESULTS Frontal and parietal bone thickness in the region of osteotomies were positively correlated with estimated blood loss (p < 0.01). After adjusting for patient weight and duration of operation, both parietal and frontal bone thickness were associated with intraoperative blood loss (R2 = 0.292, p = 0.002 and R2 = 0.216, p = 0.026). Thicker frontal and parietal bone in the line of osteotomies resulted in significantly higher odds of blood transfusion. Bone thickness in the line of parietal osteotomies was 76% accurate at identifying patients who would require blood transfusion (p = 0.004). CONCLUSIONS Frontal and parietal bone thickness in the line of osteotomies is associated with blood loss and perioperative blood transfusion for sagittal suturectomy operations.
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Affiliation(s)
- Austin M Grove
- Division of Plastic Surgery, Phoenix Children's Hospital, Phoenix Children's Center for Cleft and Craniofacial Care, Phoenix, AZ, USA
| | - Hannah M Kirsch
- Division of Plastic Surgery, Phoenix Children's Hospital, Phoenix Children's Center for Cleft and Craniofacial Care, Phoenix, AZ, USA
| | - Nicole M Kurnik
- Division of Plastic Surgery, Phoenix Children's Hospital, Phoenix Children's Center for Cleft and Craniofacial Care, Phoenix, AZ, USA
| | - Ruth E Bristol
- Division of Pediatric Neurosurgery, Department of Surgery, Barrow Neurological Institute at Phoenix Children's Hospital, Phoenix, AZ, USA
| | - Thomas J Sitzman
- Division of Plastic Surgery, Phoenix Children's Hospital, Phoenix Children's Center for Cleft and Craniofacial Care, Phoenix, AZ, USA
| | - Cory Pfeifer
- Department of Radiology, Phoenix Children's Hospital, Phoenix, AZ, USA
| | - Davinder J Singh
- Division of Plastic Surgery, Phoenix Children's Hospital, Phoenix Children's Center for Cleft and Craniofacial Care, Phoenix, AZ, USA
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Buccino F, Zagra L, Longo E, D'Amico L, Banfi G, Berto F, Tromba G, Vergani LM. Osteoporosis and Covid-19: Detected similarities in bone lacunar-level alterations via combined AI and advanced synchrotron testing. MATERIALS & DESIGN 2023; 231:112087. [PMID: 37323219 PMCID: PMC10257887 DOI: 10.1016/j.matdes.2023.112087] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 05/03/2023] [Accepted: 06/09/2023] [Indexed: 06/17/2023]
Abstract
While advanced imaging strategies have improved the diagnosis of bone-related pathologies, early signs of bone alterations remain difficult to detect. The Covid-19 pandemic has brought attention to the need for a better understanding of bone micro-scale toughening and weakening phenomena. This study used an artificial intelligence-based tool to automatically investigate and validate four clinical hypotheses by examining osteocyte lacunae on a large scale with synchrotron image-guided failure assessment. The findings indicate that trabecular bone features exhibit intrinsic variability related to external loading, micro-scale bone characteristics affect fracture initiation and propagation, osteoporosis signs can be detected at the micro-scale through changes in osteocyte lacunar features, and Covid-19 worsens micro-scale porosities in a statistically significant manner similar to the osteoporotic condition. Incorporating these findings with existing clinical and diagnostic tools could prevent micro-scale damages from progressing into critical fractures.
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Affiliation(s)
- Federica Buccino
- Department of Mechanical Engineering, Politecnico di Milano, 20156, Italy
| | - Luigi Zagra
- I.R.C.C.S Ospedale Galeazzi - Sant'Ambrogio, Milano 20157, Italy
| | - Elena Longo
- Elettra-Sincrotrone Trieste SCpA, Basovizza, Trieste 34149, Italy
| | - Lorenzo D'Amico
- Elettra-Sincrotrone Trieste SCpA, Basovizza, Trieste 34149, Italy
| | - Giuseppe Banfi
- I.R.C.C.S Ospedale Galeazzi - Sant'Ambrogio, Milano 20157, Italy
| | - Filippo Berto
- Università La Sapienza, Rome 00185, Italy
- NTNU, Norway
| | - Giuliana Tromba
- Elettra-Sincrotrone Trieste SCpA, Basovizza, Trieste 34149, Italy
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Ortún-Terrazas J, Cegoñino J, Pérez Del Palomar A. In silico approach towards neuro-occlusal rehabilitation for the early correction of asymmetrical development in a unilateral crossbite patient. INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING 2023; 39:e3688. [PMID: 36726272 DOI: 10.1002/cnm.3688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 01/09/2023] [Accepted: 01/29/2023] [Indexed: 05/13/2023]
Abstract
Neuro-occlusal rehabilitation (N.O.R.) is a discipline of the stomatognathic medicine that defends early treatments of functional malocclusions, such as unilateral crossbite, for the correction of craniofacial development, avoiding surgical procedures later in life. Nevertheless, N.O.R.'s advances have not been proved analytically yet due to the difficulties of evaluate the mechanical response after the treatment. This study aims to evaluate computationally the effect of N.O.R.'s treatments during childhood. Therefore, bilateral chewing and maximum intercuspation occlusion were modelled through a detailed finite element model of a paediatric craniofacial complex, before and after different selective grinding-alternatives. This model was subjected to the muscular forces derived from a musculoskeletal model and was validated by the occlusal contacts recorded experimentally. This approach yielded errors below 2% and reproduced successfully the occlusal, muscular, functional and mechanical imbalance before the therapies. Treatment strategies balanced the occlusal plane and reduced the periodontal overpressure (>4.7 kPa) and the mandibular over deformation (>0.002 ε) on the crossed side. Based on the principles of the mechanostat theory of bone remodelling and the pressure-tension theory of tooth movement, these findings could also demonstrate how N.O.R.'s treatments correct the malocclusion and the asymmetrical development of the craniofacial complex. Besides, N.O.R.'s treatments slightly modified the stress state and functions of the temporomandibular joints, facilitating the chewing by the unaccustomed side. These findings provide important biomechanical insights into the use of N.O.R.'s treatments for the correction of unilateral crossbite, but also encourage the application of computing methods in biomedical research and clinical practise.
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Affiliation(s)
- Javier Ortún-Terrazas
- Escuela Superior de Ingeniería y Tecnología (ESIT), Universidad Internacional de La Rioja (UNIR), Logroño, La Rioja, Spain
- Instituto Tecnológico de Aragón (ITAINNOVA), Zaragoza, Zaragoza, Spain
| | - José Cegoñino
- Instituto Tecnológico de Aragón (ITAINNOVA), Zaragoza, Zaragoza, Spain
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Geoffroy M, François PM, Khonsari RH, Laporte S. Paediatric skull growth models: A systematic review of applications to normal skulls and craniosynostoses. JOURNAL OF STOMATOLOGY, ORAL AND MAXILLOFACIAL SURGERY 2022; 123:e533-e543. [PMID: 35007781 DOI: 10.1016/j.jormas.2022.01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 12/21/2021] [Accepted: 01/04/2022] [Indexed: 06/14/2023]
Abstract
INTRODUCTION Craniosynostoses affect 1/2000 births and their incidence is currently increasing. Without surgery, craniosynostosis can lead to neurological issues due to restrained brain growth and social stigma due to abnormal head shapes. Understanding growth patterns is essential to develop surgical planning approaches and predict short- and long-term post-operative results. Here we provide a systematic review of normal and pathological cranial vault growth models. MATERIAL AND METHODS The systematic review of the literature identified descriptive and comprehensive skull growth models with the following criteria: full text articles dedicated to the skull vault of children under 2 years of age, without focus on molecular and cellular mechanisms. Models were analysed based on initial geometry, numerical method, age determination method and validation process. RESULTS A total of 14 articles including 17 models was reviewed. Four descriptive models were assessed, including 3 models using statistical analyses and 1 based on deformational methods. Thirteen comprehensive models were assessed including 7 finite element models and 6 diffusion models. Results from the current literature showed that successful models combined analyses of cranial vault shape and suture bone formation. DISCUSSION Growth modelling is central when assessing craniofacial architecture in young patients and will be a key factor in the development of future customized treatment strategies. Recurrent technical difficulties were encountered by most authors when generalizing a specific craniosynostosis model to all types of craniosynostoses, when assessing the role of the brain and when attempting to relate the age with different stages of growth.
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Affiliation(s)
- Maya Geoffroy
- Arts et Métiers Institute of Technology, Université Paris Nord, IBHGC - Institut de Biomécanique Humaine Georges Charpak, HESAM Université, F-75013, Paris, France; Service de Chirurgie Maxillofaciale et Chirurgie Plastique, Hôpital Necker - Enfants Malades, Assistance Publique - Hôpitaux de Paris; Faculté de Médecine, Université de Paris; 149 Rue de Sèvres, 75015 Paris, France; BONE 3D; 14 Rue Jean Antoine de Baïf, 75013 Paris, France.
| | | | - Roman Hossein Khonsari
- Service de Chirurgie Maxillofaciale et Chirurgie Plastique, Hôpital Necker - Enfants Malades, Assistance Publique - Hôpitaux de Paris; Faculté de Médecine, Université de Paris; 149 Rue de Sèvres, 75015 Paris, France.
| | - Sébastien Laporte
- Arts et Métiers Institute of Technology, Université Paris Nord, IBHGC - Institut de Biomécanique Humaine Georges Charpak, HESAM Université, F-75013, Paris, France.
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Cross C, Khonsari RH, Patermoster G, Arnaud E, Larysz D, Kölby L, Johnson D, Ventikos Y, Moazen M. A Computational Framework to Predict Calvarial Growth: Optimising Management of Sagittal Craniosynostosis. Front Bioeng Biotechnol 2022; 10:913190. [PMID: 35685092 PMCID: PMC9170984 DOI: 10.3389/fbioe.2022.913190] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Accepted: 05/10/2022] [Indexed: 11/13/2022] Open
Abstract
The neonate skull consists of several bony plates, connected by fibrous soft tissue called sutures. Premature fusion of sutures is a medical condition known as craniosynostosis. Sagittal synostosis, caused by premature fusion of the sagittal suture, is the most common form of this condition. The optimum management of this condition is an ongoing debate in the craniofacial community while aspects of the biomechanics and mechanobiology are not well understood. Here, we describe a computational framework that enables us to predict and compare the calvarial growth following different reconstruction techniques for the management of sagittal synostosis. Our results demonstrate how different reconstruction techniques interact with the increasing intracranial volume. The framework proposed here can be used to inform optimum management of different forms of craniosynostosis, minimising the risk of functional consequences and secondary surgery.
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Affiliation(s)
- Connor Cross
- Department of Mechanical Engineering, University College London, London, United Kingdom
| | - Roman H Khonsari
- Department of Maxillofacial Surgery and Plastic Surgery, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France.,Department of Neurosurgery, Craniofacial Surgery Unit, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Giovanna Patermoster
- Department of Neurosurgery, Craniofacial Surgery Unit, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Eric Arnaud
- Department of Neurosurgery, Craniofacial Surgery Unit, Necker-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Dawid Larysz
- Department of Head and Neck Surgery for Children and Adolescents, University of Warmia and Mazury in Olsztyn, Prof. St. Popowski Regional Specialized Children's Hospital, Olsztyn, Poland
| | - Lars Kölby
- Department of Plastic Surgery, Sahlgrenska University Hospital, University of Gothenburg, Gothenburg, Sweden
| | - David Johnson
- Oxford Craniofacial Unit, Oxford University Hospital, Oxford, United Kingdom
| | - Yiannis Ventikos
- Department of Mechanical Engineering, University College London, London, United Kingdom
| | - Mehran Moazen
- Department of Mechanical Engineering, University College London, London, United Kingdom
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Polarization and angular insensitive bendable metamaterial absorber for UV to NIR range. Sci Rep 2022; 12:4857. [PMID: 35318387 PMCID: PMC8941150 DOI: 10.1038/s41598-022-08829-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 03/14/2022] [Indexed: 11/24/2022] Open
Abstract
Broadband absorbers are required for solar energy harvesting because they efficiently absorb the incident photon in the wide-ranging solar spectrum. To ensure high absorption of photons, metamaterial absorbers (MMAs) have been a growing area of interest in recent years. In this article, an MMA is proposed using a metal–insulator–metal (MIM) structure (Ni–SiO2–Ni) that shows a near-unity broadband absorption of wavelengths from 300 to 1600 nm, with a 95.77% average absorption and a peak absorption of 99.999% at 772.82 nm. The MMA is polarization insensitive as well as wide incident angle stable. Analysis of the effects of mechanical bending on the absorption of the proposed structure shows that absorption holds satisfactory values at different degrees of mechanical loading. The suggested MMA unit cell structure was computationally simulated using the Finite Integration Technique (FIT) and verified using the Finite Element Method (FEM). To analyze the feasibility of the proposed MMA as a solar cell, it is investigated with the universal AM 1.5 solar spectrum characteristics. Besides solar energy harvesting, the proposed MMA unit cell may be employed in a variety of diverse optical applications, including sensors, detectors, and imaging.
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Xie B, Sakamoto R, Kitajou A, Zhao L, Nakamoto K, Okada S, Albrecht K, Kobayashi W, Okada M, Takahara T. Enhanced electrochemical performance of Li 2.72Na 0.31MnPO 4CO 3 as a cathode material in "water-in-salt" electrolytes. Chem Commun (Camb) 2021; 57:12840-12843. [PMID: 34787135 DOI: 10.1039/d1cc04350a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A carbonophosphate compound of Li2.72Na0.31MnPO4CO3 was synthesized via ion exchange. The initial discharge capacity of Li2.72Na0.31MnPO4CO3 in 15 molal (or 15 m) LiTFSI was 110 mA h g-1 at 2 mA cm-2 (∼0.5C). Due to the decomposition of Li2.72Na0.31MnPO4CO3, the capacity retention degraded to 64% after 100 cycles.
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Affiliation(s)
- Baowei Xie
- Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
| | - Ryo Sakamoto
- Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
| | - Ayuko Kitajou
- Graduate School of Sciences and Technology for Innovation, 2-16-1 Tokiwadai, Ube 755-8611, Japan
| | - Liwei Zhao
- Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan.
| | - Kosuke Nakamoto
- Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan.
| | - Shigeto Okada
- Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan.
| | - Ken Albrecht
- Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan. .,JST-PRESTO, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
| | - Wataru Kobayashi
- Tosoh Corporation, 3-8-2, Shiba, Minato-Ku, Tokyo 105-8623, Japan
| | - Masaki Okada
- Tosoh Corporation, 3-8-2, Shiba, Minato-Ku, Tokyo 105-8623, Japan
| | - Toshiya Takahara
- Tosoh Corporation, 3-8-2, Shiba, Minato-Ku, Tokyo 105-8623, Japan
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11
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Cross C, Khonsari RH, Larysz D, Johnson D, Kölby L, Moazen M. Predicting and comparing three corrective techniques for sagittal craniosynostosis. Sci Rep 2021; 11:21216. [PMID: 34707183 PMCID: PMC8551239 DOI: 10.1038/s41598-021-00642-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 10/08/2021] [Indexed: 11/26/2022] Open
Abstract
Sagittal synostosis is the most occurring form of craniosynostosis, resulting in calvarial deformation and possible long-term neurocognitive deficits. Several surgical techniques have been developed to correct these issues. Debates as to the most optimal approach are still ongoing. Finite element method is a computational tool that's shown to assist with the management of craniosynostosis. The aim of this study was to compare and predict the outcomes of three reconstruction methods for sagittal craniosynostosis. Here, a generic finite element model was developed based on a patient at 4 months of age and was virtually reconstructed under all three different techniques. Calvarial growth was simulated to predict the skull morphology and the impact of different reconstruction techniques on the brain growth up to 60 months of age. Predicted morphology was then compared with in vivo and literature data. Our results show a promising resemblance to morphological outcomes at follow up. Morphological characteristics between considered techniques were also captured in our predictions. Pressure outcomes across the brain highlight the potential impact that different techniques have on growth. This study lays the foundation for further investigation into additional reconstructive techniques for sagittal synostosis with the long-term vision of optimizing the management of craniosynostosis.
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Affiliation(s)
- Connor Cross
- Department of Mechanical Engineering, University College London, London, UK
| | - Roman H Khonsari
- Department of Maxillofacial Surgery and Plastic Surgery, School of Medicine, Necker - Enfants Malades University Hospital, Assistance Publique - Hôpitaux de Paris, University of Paris, Paris, France
| | - Dawid Larysz
- Department of Head and Neck Surgery for Children and Adolescents, University of Warmia and Mazury in Olsztyn. Ul, Zolnierska 18a, 10-561, Olsztyn, Poland
| | - David Johnson
- Oxford Craniofacial Unit, Oxford University Hospital, NHS Foundation Trust, Oxford, UK
| | - Lars Kölby
- Department of Plastic Surgery, Sahlgrenska University Hospital, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Mehran Moazen
- Department of Mechanical Engineering, University College London, London, UK.
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Galiay L, Hennocq Q, Cross C, Arnaud E, Larysz D, Kölby L, Paternoster G, Khonsari RH, Moazen M. Management of sagittal craniosynostosis: Morphological comparison of 8 surgical techniques. Br J Oral Maxillofac Surg 2021; 60:499-506. [DOI: 10.1016/j.bjoms.2021.09.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 09/14/2021] [Indexed: 12/18/2022]
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Cross C, Khonsari RH, Galiay L, Patermoster G, Johnson D, Ventikos Y, Moazen M. Using Sensitivity Analysis to Develop a Validated Computational Model of Post-operative Calvarial Growth in Sagittal Craniosynostosis. Front Cell Dev Biol 2021; 9:621249. [PMID: 34124030 PMCID: PMC8187911 DOI: 10.3389/fcell.2021.621249] [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: 10/25/2020] [Accepted: 04/21/2021] [Indexed: 11/13/2022] Open
Abstract
Craniosynostosis is the premature fusion of one or more sutures across the calvaria, resulting in morphological and health complications that require invasive corrective surgery. Finite element (FE) method is a powerful tool that can aid with preoperative planning and post-operative predictions of craniosynostosis outcomes. However, input factors can influence the prediction of skull growth and the pressure on the growing brain using this approach. Therefore, the aim of this study was to carry out a series of sensitivity studies to understand the effect of various input parameters on predicting the skull morphology of a sagittal synostosis patient post-operatively. Preoperative CT images of a 4-month old patient were used to develop a 3D model of the skull, in which calvarial bones, sutures, cerebrospinal fluid (CSF), and brain were segmented. Calvarial reconstructive surgery was virtually modeled and two intracranial content scenarios labeled “CSF present” and “CSF absent,” were then developed. FE method was used to predict the calvarial morphology up to 76 months of age with intracranial volume-bone contact parameters being established across the models. Sensitivity tests with regards to the choice of material properties, methods of simulating bone formation and the rate of bone formation across the sutures were undertaken. Results were compared to the in vivo data from the same patient. Sensitivity tests to the choice of various material properties highlighted that the defined elastic modulus for the craniotomies appears to have the greatest influence on the predicted overall skull morphology. The bone formation modeling approach across the sutures/craniotomies had a considerable impact on the level of contact pressure across the brain with minimum impact on the overall predicated morphology of the skull. Including the effect of CSF (based on the approach adopted here) displayed only a slight reduction in brain pressure outcomes. The sensitivity tests performed in this study set the foundation for future comparative studies using FE method to compare outcomes of different reconstruction techniques for the management of craniosynostosis.
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Affiliation(s)
- Connor Cross
- Department of Mechanical Engineering, University College London, London, United Kingdom
| | - Roman H Khonsari
- Service de Chirurgie Maxillo-Faciale et Plastique, Assistance Publique des Hôpitaux de Paris, Paris, France
| | - Leila Galiay
- Service de Chirurgie Maxillo-Faciale et Plastique, Assistance Publique des Hôpitaux de Paris, Paris, France
| | - Giovanna Patermoster
- Department of Neurosurgery, Craniofacial 16 Surgery Unit, Necker-Enfants Malades University Hospital, Assistance Publique-Hôpitaux de 17 Paris, Université de Paris, Paris, France
| | - David Johnson
- Oxford Craniofacial Unit, Oxford University Hospital, NHS Foundation Trust, Oxford, United Kingdom
| | - Yiannis Ventikos
- Department of Mechanical Engineering, University College London, London, United Kingdom
| | - Mehran Moazen
- Department of Mechanical Engineering, University College London, London, United Kingdom
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White HE, Goswami A, Tucker AS. The Intertwined Evolution and Development of Sutures and Cranial Morphology. Front Cell Dev Biol 2021; 9:653579. [PMID: 33842480 PMCID: PMC8033035 DOI: 10.3389/fcell.2021.653579] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 03/08/2021] [Indexed: 12/21/2022] Open
Abstract
Phenotypic variation across mammals is extensive and reflects their ecological diversification into a remarkable range of habitats on every continent and in every ocean. The skull performs many functions to enable each species to thrive within its unique ecological niche, from prey acquisition, feeding, sensory capture (supporting vision and hearing) to brain protection. Diversity of skull function is reflected by its complex and highly variable morphology. Cranial morphology can be quantified using geometric morphometric techniques to offer invaluable insights into evolutionary patterns, ecomorphology, development, taxonomy, and phylogenetics. Therefore, the skull is one of the best suited skeletal elements for developmental and evolutionary analyses. In contrast, less attention is dedicated to the fibrous sutural joints separating the cranial bones. Throughout postnatal craniofacial development, sutures function as sites of bone growth, accommodating expansion of a growing brain. As growth frontiers, cranial sutures are actively responsible for the size and shape of the cranial bones, with overall skull shape being altered by changes to both the level and time period of activity of a given cranial suture. In keeping with this, pathological premature closure of sutures postnatally causes profound misshaping of the skull (craniosynostosis). Beyond this crucial role, sutures also function postnatally to provide locomotive shock absorption, allow joint mobility during feeding, and, in later postnatal stages, suture fusion acts to protect the developed brain. All these sutural functions have a clear impact on overall cranial function, development and morphology, and highlight the importance that patterns of suture development have in shaping the diversity of cranial morphology across taxa. Here we focus on the mammalian cranial system and review the intrinsic relationship between suture development and morphology and cranial shape from an evolutionary developmental biology perspective, with a view to understanding the influence of sutures on evolutionary diversity. Future work integrating suture development into a comparative evolutionary framework will be instrumental to understanding how developmental mechanisms shaping sutures ultimately influence evolutionary diversity.
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Affiliation(s)
- Heather E White
- Department of Life Sciences, Natural History Museum, London, United Kingdom.,Centre for Craniofacial and Regenerative Biology, King's College London, London, United Kingdom.,Division of Biosciences, University College London, London, United Kingdom
| | - Anjali Goswami
- Department of Life Sciences, Natural History Museum, London, United Kingdom.,Division of Biosciences, University College London, London, United Kingdom
| | - Abigail S Tucker
- Centre for Craniofacial and Regenerative Biology, King's College London, London, United Kingdom
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