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Deliege L, Carriero A, Ong J, James G, Jeelani O, Dunaway D, Stoltz P, Hersh D, Martin J, Carroll K, Chamis M, Schievano S, Bookland M, Borghi A. A computational modelling tool for prediction of head reshaping following endoscopic strip craniectomy and helmet therapy for the treatment of scaphocephaly. Comput Biol Med 2024; 177:108633. [PMID: 38805810 DOI: 10.1016/j.compbiomed.2024.108633] [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: 12/21/2023] [Revised: 05/10/2024] [Accepted: 05/18/2024] [Indexed: 05/30/2024]
Abstract
BACKGROUND Endoscopic strip craniectomy followed by helmet therapy (ESCH) is a minimally invasive approach for correcting sagittal craniosynostosis. The treatment involves a patient-specific helmet designed to facilitate lateral growth while constraining sagittal expansion. In this study, finite element modelling was used to predict post-treatment head reshaping, improving our comprehension of the necessary helmet therapy duration. METHOD Six patients (aged 11 weeks to 9 months) who underwent ESCH at Connecticut Children's Hospital were enrolled in this study. Day-1 post-operative 3D scans were used to create skin, skull, and intracranial volume models. Patient-specific helmet models, incorporating areas for growth, were designed based on post-operative imaging. Brain growth was simulated through thermal expansion, and treatments were modelled according to post-operative Imaging available. Mechanical testing and finite element modelling were combined to determine patient-specific mechanical properties from bone samples collected from surgery. Validation compared simulated end-of-treatment skin surfaces with optical scans in terms of shape matching and cranial index estimation. RESULTS Comparison between the simulated post-treatment head shape and optical scans showed that on average 97.3 ± 2.1 % of surface data points were within a distance range of -3 to 3 mm. The cranial index was also accurately predicted (r = 0.91). CONCLUSIONS In conclusion, finite element models effectively predicted the ESCH cranial remodeling outcomes up to 8 months postoperatively. This computational tool offers valuable insights to guide and refine helmet treatment duration. This study also incorporated patient-specific material properties, enhancing the accuracy of the modeling approach.
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Eggington J, Pitt R, Hodson C. A macroscopic assessment of porosity and new bone formation on the inferior pars basilaris: Normal growth or an indicator of scurvy? INTERNATIONAL JOURNAL OF PALEOPATHOLOGY 2024; 45:62-72. [PMID: 38781795 DOI: 10.1016/j.ijpp.2024.05.001] [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: 11/15/2023] [Revised: 04/17/2024] [Accepted: 05/13/2024] [Indexed: 05/25/2024]
Abstract
OBJECTIVES This research aims to determine the aetiology of porosity and subperiosteal new bone formation on the inferior surface of the pars basilaris. MATERIALS A total of 199 non-adult individuals aged 36 weeks gestation to 3.5 years, from a total of 12 archaeological sites throughout the UK, including Iron Age (n=43), Roman (n=12), and post-medieval (n=145) sites, with a preserved pars basilaris. METHODS The pars basilaris was divided into six segments, with porosity (micro and macro) and subperiosteal new bone formation recorded on the inferior surface in scorbutic and non-scorbutic individuals. Scurvy was diagnosed using criteria from the palaeopathological literature that was developed using a biological approach. RESULTS There was no statistically significant difference in microporosity between scorbutic and non-scorbutic individuals in four out of the six segments analysed. There was a significant negative correlation between age and microporosity in non-scorbutic and scorbutic individuals. A significant difference in subperiosteal new bone formation was observed between scorbutic and non-scorbutic individuals. CONCLUSIONS Microporosity on the inferior pars basilaris should not be considered among the suite of lesions included in the macroscopic assessment of scurvy in non-adult skeletal remains (less than 3.5 years). SIGNIFICANCE This study highlights the risk of over diagnosing scurvy in past populations. LIMITATIONS It is difficult to distinguish between physiological (normal) and pathological (abnormal) bone changes in the skeleton of individuals less than one year of age. SUGGESTIONS FOR FURTHER RESEARCH Future research should focus on the analysis of individuals over 3.5 years of age.
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Affiliation(s)
- Jack Eggington
- Department of Archaeology, University of Reading, UK; School of History, Archaeology and Religion, Cardiff University, UK.
| | - Rebecca Pitt
- Department of Archaeology, University of Reading, UK
| | - Claire Hodson
- Department of Archaeology, University of Reading, UK; Department of Archaeology, Durham University, UK
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Li H, Hao J, Liu X. Research progress and perspective of metallic implant biomaterials for craniomaxillofacial surgeries. Biomater Sci 2024; 12:252-269. [PMID: 38170634 DOI: 10.1039/d2bm01414a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Craniomaxillofacial bone serves a variety of functions. However, the increasing number of cases of craniomaxillofacial bone injury and the use of selective rare implants make the treatment difficult, and the cure rate is low. If such a bone injury is not properly treated, it can lead to a slew of complications that can seriously disrupt a patient's daily life. For example, premature closure of cranial sutures or skull fractures can lead to increased intracranial pressure, which can lead to headaches, vomiting, and even brain hernia. At present, implant placement is one of the most common approaches to repair craniomaxillofacial bone injury or abnormal closure, especially with biomedical metallic implants. This review analyzes the research progress in the design and development of degradable and non-degradable metallic implants in craniomaxillofacial surgery. The mechanical properties, corrosion behaviours, as well as in vitro and in vivo performances of these materials are summarized. The challenges and future research directions of metallic biomaterials used in craniomaxillofacial surgery are also identified.
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Affiliation(s)
- Huafang Li
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
| | - Jiaqi Hao
- School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
| | - Xiwei Liu
- Lepu Medical Technology Co., Ltd, Beijing 102200, China
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Adanty K, Bhagavathula KB, Tronchin O, Li DX, Rabey KN, Doschak MR, Adeeb S, Hogan J, Ouellet S, Plaisted TA, Satapathy SS, Romanyk DL, Dennison CR. The Mechanical Characterization and Comparions of Male and Female Calvaria Under Four-Point Bending Impacts. J Biomech Eng 2023; 145:1153590. [PMID: 36511109 DOI: 10.1115/1.4056459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Accepted: 12/02/2022] [Indexed: 12/15/2022]
Abstract
The circumstances in which we mechanically test and critically assess human calvarium tissue would find relevance under conditions encompassing real-world head impacts. These conditions include, among other variables, impact velocities, and strain rates. Compared to quasi-static loading on calvaria, there is less reporting on the impact loading of the calvaria and consequently, there are relatively fewer mechanical properties on calvaria at relevant impact loading rates available in the literature. The purpose of this work was to report on the mechanical response of 23 human calvarium specimens subjected to dynamic four-point bending impacts. Impacts were performed using a custom-built four-point impact apparatus at impact velocities of 0.86-0.89 m/s resulting in surface strain rates of 2-3/s-representative of strain rates observed in vehicle collisions and blunt impacts. The study revealed comparable effective bending moduli (11-15 GPa) to the limited work reported on the impact mechanics of calvaria in the literature, however, fracture bending stress (10-47 MPa) was relatively less. As expected, surface strains at fracture (0.21-0.25%) were less compared to studies that performed quasi-static bending. Moreover, the study revealed no significant differences in mechanical response between male and female calvaria. The findings presented in this work are relevant to many areas including validating surrogate skull fracture models in silico or laboratory during impact and optimizing protective devices used by civilians to reduce the risk of a serious head injury.
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Affiliation(s)
- Kevin Adanty
- Biomedical Instrumentation Laboratory, Donadeo Innovation Center for Engineering, Department of Mechanical Engineering, University of Alberta, 9211 116 Street NW, Edmonton, AB T6G 2E1, Canada
| | - Kapil B Bhagavathula
- Donadeo Innovation Center for Engineering, Department of Mechanical Engineering, University of Alberta, 9211 116 Street NW, Edmonton, AB T6G 2E1, Canada
| | - Olivia Tronchin
- Biomedical Instrumentation Laboratory, Donadeo Innovation Center for Engineering, Department of Mechanical Engineering, University of Alberta, 9211 116 Street NW, Edmonton, AB T6G 2E1, Canada
| | - David X Li
- Biomedical Instrumentation Laboratory, Donadeo Innovation Center for Engineering, Department of Mechanical Engineering, University of Alberta, 9211 116 Street NW, Edmonton, AB T6G 2E1, Canada
| | - Karyne N Rabey
- Department of Surgery, Division of Anatomy, University of Alberta, 2J2.00 WC Mackenzie Health Sciences Centre, 8440-112 Street NW, Edmonton, AB T6G 2R7, Canada; Department of Anthropology, Faculty of Arts, University of Alberta, 13-15 Tory Building, Edmonton, AB T6G 2H4, Canada
| | - Michael R Doschak
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Medical Sciences Building, 8613 114 Street NW, Edmonton, AB T6G 2H7, Canada
| | - Samer Adeeb
- Donadeo Innovation Centre for Engineering, Department of Civil and Environmental Engineering, University of Alberta, 9211 116 Street NW, Edmonton, AB T6G 1H9, Canada
| | - James Hogan
- Donadeo Innovation Center for Engineering, Department of Mechanical Engineering, University of Alberta, 9211 116 Street NW, Edmonton, AB T6G 2E1, Canada
| | - Simon Ouellet
- Defense Research and Development Canada, Valcartier Research Centre, 2459, de la, Route de la Bravoure, Quebec City, QC G3J 1X5, Canada
| | - Thomas A Plaisted
- U.S. Army Combat Capabilities Development Command, Army Research Laboratory, Aberdeen Proving Ground, MD 21005
| | - Sikhanda S Satapathy
- U.S. Army Combat Capabilities Development Command, Army Research Laboratory, Aberdeen Proving Ground, MD 21005
| | - Dan L Romanyk
- Donadeo Innovation Center for Engineering, Department of Mechanical Engineering, University of Alberta, 9211 116 Street NW, Edmonton, AB T6G 2E1, Canada; School of Dentistry, University of Alberta, 7-020 H Katz Group Centre for Pharmacy and Health Research, 87 Ave 114 Street, Edmonton, AB T6G 2E1, Canada
| | - Christopher R Dennison
- Biomedical Instrumentation Laboratory, Donadeo Innovation Center for Engineering, Department of Mechanical Engineering, University of Alberta, 9211 116 Street NW, Edmonton, AB T6G 2E1, Canada; Department of Mechanical Engineering, University of Victoria, Engineering Office Wing, Room 548 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada
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He J, Wu J, Zhu Y, Chen Y, Yuan M, Zeng L, Ji X. Multitarget Transcranial Ultrasound Therapy in Small Animals Based on Phase-Only Acoustic Holographic Lens. IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL 2022; 69:662-671. [PMID: 34847028 DOI: 10.1109/tuffc.2021.3131752] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Transcranial ultrasound therapy has become a noninvasive method for treating neurological and psychiatric disorders, and studies have further demonstrated that multitarget transcranial ultrasound therapy is a better solution. At present, multitarget transcranial ultrasound therapy in small animals can only be achieved by the multitransducer or phased array. However, multiple transducers may cause spatial interference, and the phased array system is complicated, expensive, and especially unsuitable for small animals. This study is the first to design and fabricate a miniature acoustic holography lens for multitarget transcranial ultrasound therapy in rats. The acoustic holographic lens, working at a frequency of 1.0 MHz, with a size of 10.08 mm ×10.08 mm and a pixel resolution of 0.72 mm, was designed, optimized, and fabricated. The dual-focus transcranial ultrasound generated based on the lens was measured; the full-width at half-maximum (FWHM) of the focal spots in the y -direction was 2.15 and 2.27 mm and in the z -direction was 2.3 and 2.36 mm. The focal length was 5.4 mm, and the distance between the two focuses was 5.6 mm, close to the desired values of 5.4 and 6.0 mm. Finally, the multiple-target blood-brain barrier opening in rats' bilateral secondary visual cortex (mediolateral area, V2ML) was demonstrated using the transcranial ultrasound therapy system based on the lens. These results demonstrate the good performance of the multitarget transcranial ultrasound therapy system for small animals, including high spatial resolution, small size, and low cost.
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