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Poudrel AS, Bouffandeau A, Rosi G, Dubory A, Lachaniette CHF, Nguyen VH, Haiat G. 3-D finite element model of the impaction of a press-fitted femoral stem under various biomechanical environments. Comput Biol Med 2024; 174:108405. [PMID: 38613890 DOI: 10.1016/j.compbiomed.2024.108405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 03/04/2024] [Accepted: 04/01/2024] [Indexed: 04/15/2024]
Abstract
BACKGROUND Uncemented femoral stem insertion into the bone is achieved by applying successive impacts on an inserter tool called "ancillary". Impact analysis has shown to be a promising technique to monitor the implant insertion and to improve its primary stability. METHOD This study aims to provide a better understanding of the dynamic phenomena occurring between the hammer, the ancillary, the implant and the bone during femoral stem insertion, to validate the use of impact analyses for implant insertion monitoring. A dynamic 3-D finite element model of the femoral stem insertion via an impaction protocol is proposed. The influence of the trabecular bone Young's modulus (Et), the interference fit (IF), the friction coefficient at the bone-implant interface (μ) and the impact velocity (v0) on the implant insertion and on the impact force signal is evaluated. RESULTS For all configurations, a decrease of the time difference between the two first peaks of the impact force signal is observed throughout the femoral stem insertion, up to a threshold value of 0.23 ms. The number of impacts required to reach this value depends on Et, v0 and IF and varies between 3 and 8 for the set of parameters considered herein. The bone-implant contact ratio reached after ten impacts varies between 60% and 98%, increases as a function of v0 and decreases as a function of IF, μ and Et. CONCLUSION This study confirms the potential of an impact analyses-based method to monitor implant insertion and to retrieve bone-implant contact properties.
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Affiliation(s)
- Anne-Sophie Poudrel
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France
| | - Arthur Bouffandeau
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France
| | - Giuseppe Rosi
- Univ Paris Est Creteil, Univ Gustave Eiffel, CNRS, UMR 8208, MSME, F-94010 Créteil, France
| | - Arnaud Dubory
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est, Créteil, France
| | - Charles-Henri Flouzat Lachaniette
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est, Créteil, France
| | - Vu-Hieu Nguyen
- Univ Paris Est Creteil, Univ Gustave Eiffel, CNRS, UMR 8208, MSME, F-94010 Créteil, France
| | - Guillaume Haiat
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France.
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Poudrel AS, Bouffandeau A, Demeet OL, Rosi G, Nguyen VH, Haiat G. Characterization of the concentration of agar-based soft tissue mimicking phantoms by impact analysis. J Mech Behav Biomed Mater 2024; 152:106465. [PMID: 38377641 DOI: 10.1016/j.jmbbm.2024.106465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 01/14/2024] [Accepted: 02/13/2024] [Indexed: 02/22/2024]
Abstract
In various medical fields, a change of soft tissue stiffness is associated with its physio-pathological evolution. While elastography is extensively employed to assess soft tissue stiffness in vivo, its application requires a complex and expensive technology. The aim of this study is to determine whether an easy-to-use method based on impact analysis can be employed to determine the concentration of agar-based soft tissue mimicking phantoms. Impact analysis was performed on soft tissue mimicking phantoms made of agar gel with a mass concentration ranging from 1% to 5%. An indicator Δt is derived from the temporal variation of the impact force signal between the hammer and a small beam in contact with the sample. The results show a non-linear decrease of Δt as a function of the agar concentration (and thus of the sample stiffness). The value of Δt provides an estimation of the agar concentration with an error of 0.11%. This sensitivity of the impact analysis based method to the agar concentration is of the same order of magnitude than results obtained with elastography techniques. This study opens new paths towards the development of impact analysis for a fast, easy and relatively inexpensive clinical evaluation of soft tissue elastic properties.
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Affiliation(s)
- Anne-Sophie Poudrel
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France
| | - Arthur Bouffandeau
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France
| | - Oriane Le Demeet
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France
| | - Giuseppe Rosi
- Univ Paris Est Creteil, Univ Gustave Eiffel, CNRS, UMR 8208, MSME, F-94010 Créteil, France
| | - Vu-Hieu Nguyen
- Univ Paris Est Creteil, Univ Gustave Eiffel, CNRS, UMR 8208, MSME, F-94010 Créteil, France
| | - Guillaume Haiat
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-94010 Créteil, France.
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Poudrel AS, Rosi G, Nguyen VH, Housset V, Flouzat-Lachaniette CH, Haiat G. Detection of periprosthetic fractures around the femoral stem by resonance frequency analysis: An in vitro study. Proc Inst Mech Eng H 2023:9544119231163632. [PMID: 36992542 DOI: 10.1177/09544119231163632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Periprosthetic femoral bone fractures are frequent complications of Total Hip Arthroplasty (THA) and may occur during the insertion of uncemented Femoral Stems (FS), due to the nature of the press-fit fixation. Such fracture may lead to the surgical failure of the THA and require a revision surgery, which may have dramatic consequences. Therefore, an early detection of intra-operative fractures is important to avoid worsening the fracture and/or to enable a peroperative treatment. The aim of this in vitro study is to determine the sensitivity of a method based on resonance frequency analysis of the bone-stem-ancillary system for periprosthetic fractures detection. A periprosthetic fracture was artificially created close to the lesser-trochanter of 10 femoral bone mimicking phantoms. The bone-stem-ancillary resonance frequencies in the range (2-12) kHz were measured on an ancillary instrumented with piezoelectric sensors, which was fixed to the femoral stem. The measurements were repeated for different fracture lengths from 4 to 55 mm. The results show a decrease of the resonance frequencies due to the fracture occurrence and propagation. The frequency shift reached up to 170 Hz. The minimum fracture length that can be detected varies from 3.1±1.7 mm to 5.9±1.9 mm according to the mode and to the specimen. A significantly higher sensitivity (p = 0.011) was obtained for a resonance frequency around 10.6 kHz, corresponding to a mode vibrating in a plane perpendicular to the fracture. This study opens new paths toward the development of non-invasive vibration-based methods for intra-operative periprosthetic fractures detection.
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Affiliation(s)
- Anne-Sophie Poudrel
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-96010 Créteil
| | - Giuseppe Rosi
- Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-96010 Créteil, France
| | - Vu-Hieu Nguyen
- Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-96010 Créteil, France
| | - Victor Housset
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est Créteil, Créteil, France
- INSERM U955, IMRB, Université Paris-Est Créteil, Créteil, France
| | - Charles-Henri Flouzat-Lachaniette
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est Créteil, Créteil, France
- INSERM U955, IMRB, Université Paris-Est Créteil, Créteil, France
| | - Guillaume Haiat
- CNRS, Univ Paris Est Creteil, Univ Gustave Eiffel, UMR 8208, MSME, F-96010 Créteil
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Hériveaux Y, Le Cann S, Immel K, Vennat E, Nguyen VH, Brailovski V, Karasinski P, Sauer RA, Haïat G. Debonding of coin-shaped osseointegrated implants: Coupling of experimental and numerical approaches. J Mech Behav Biomed Mater 2023; 141:105787. [PMID: 36989873 DOI: 10.1016/j.jmbbm.2023.105787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 03/06/2023] [Accepted: 03/16/2023] [Indexed: 03/19/2023]
Abstract
While cementless implants are now widely used clinically, implant debonding still occur and is difficult to anticipate. Assessing the biomechanical strength of the bone-implant interface can help improving the understanding of osseointegration phenomena and thus preventing surgical failures. A dedicated and standardized implant model was considered. The samples were tested using a mode III cleavage device to assess the mechanical strength of the bone-implant interface by combining experimental and numerical approaches. Four rough (Sa = 24.5 μm) osseointegrated coin-shaped implants were left in sheep cortical bone during 15 weeks of healing time. Each sample was experimentally rotated at 0.03°/sec until complete rupture of the interface. The maximum values of the torque were comprised between 0.48 and 0.72 N m, while a significant increase of the normal force from 7-12 N to 31-43 N was observed during the bone-implant interface debonding, suggesting the generation of bone debris at the bone-implant interface. The experimental results were compared to an isogeometric finite element model describing the adhesion and debonding phenomena through a modified Coulomb's law, based on a varying friction coefficient to represent the transition from an unbroken to a broken bone-implant interface. A good agreement was found between numerical and experimental torques, with numerical friction coefficients decreasing from 8.93 to 1.23 during the bone-implant interface rupture, which constitutes a validation of this model to simulate the debonding of an osseointegrated bone-implant interface subjected to torsion.
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Poudrel AS, Nguyen VH, Rosi G, Haiat G. Influence of the biomechanical environment on the femoral stem insertion and vibrational behavior: a 3-D finite element study. Biomech Model Mechanobiol 2022; 22:611-628. [PMID: 36542227 DOI: 10.1007/s10237-022-01667-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 12/04/2022] [Indexed: 12/24/2022]
Abstract
The long-term success of cementless surgery strongly depends on the implant primary stability. The femoral stem initial fixation relies on multiple geometrical and material factors, but their influence on the biomechanical phenomena occurring during the implant insertion is still poorly understood, as they are difficult to quantify in vivo. The aim of the present study is to evaluate the relationship between the resonance frequencies of the bone-implant-ancillary system and the stability of the femoral stem under various biomechanical environments. The interference fit IF, the trabecular bone Young's modulus [Formula: see text] and the bone-implant contact friction coefficient [Formula: see text] are varied to investigate their influence on the implant insertion phenomena and on the system vibration behavior. The results exhibit for all the configurations, a nonlinear increase in the bone-implant contact throughout femoral stem insertion, until the proximal contact is reached. While the pull-out force increases with [Formula: see text], IF and [Formula: see text], the bone-implant contact ratio decreases, which shows that a compromise on the set of parameters could be found in order to achieve the largest bone-implant contact while maintaining sufficient pull-out force. The modal analysis on the range [2-7] kHz shows that the resonance frequencies of the bone-implant-ancillary system increase with the bone-implant contact ratio and the trabecular bone Young's modulus, with a sensitivity that varies over the modes. Both the pull-out forces and the vibration behavior are consistent with previous experimental studies. This study demonstrates the potential of using vibration methods to guide the surgeons for optimizing implant stability in various patients and surgical configurations.
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Hériveaux Y, Nguyen VH, Haïat G. Ultrasonic Evaluation of the Bone-Implant Interface. Advances in Experimental Medicine and Biology 2022; 1364:373-396. [DOI: 10.1007/978-3-030-91979-5_17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Nguyen VH, Yeo YH, Zou B, Le MH, Henry L, Cheung RC, Nguyen MH. Discrepancies between actual weight, weight perception and weight loss intention amongst persons with NAFLD. J Intern Med 2021; 289:840-850. [PMID: 33340186 DOI: 10.1111/joim.13203] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 10/21/2020] [Indexed: 12/11/2022]
Abstract
BACKGROUND Currently, weight loss remains the main management strategy for NAFLD, but the weight loss intention and methods remain poorly characterized. METHODS We analysed data about the perception of weight status, intention and methods to lose weight amongst 3,822 persons with NAFLD (United States Fatty Liver Index ≥ 30) from the National Health and Nutrition Examination Survey, 2001-2014. RESULTS Only 53.9% of people with NAFLD intended to lose weight, 91.8% with perception of overweight and 8.2% with normal weight perception. Persons with perception of overweight or overweight/obese status were four times more likely to try to lose weight (adjusted odds ratios 3.9 and 4.2, respectively, both P < 0.0001). Younger age, women, higher educational level, Hispanic and blacks (versus whites) were significant independent factors associated with weight loss intention. Notably, ≤10% attended weight loss programme. Metabolic equivalent of task hours per week was significantly higher in whites who exercised to lose weight (vs. no exercise, P = 0.003) but not in other racial/ethnic groups. Interestingly, calorie intake was similar between those who dieted versus not (2056 vs. 1970 kcal/day, P = 0.11). About 30% reported ≥ 10-lb weight loss, with 50% higher odds of success for men but there was no difference by race/ethnicity. CONCLUSION Overweight or obese perception was a key driver in weight loss activities but was inconsistent with actual weight status and varied by race/ethnicity and other sociodemographic factors. Weight loss programme is under-utilized and should take in account of weight perception training and culturally appropriate approach.
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Affiliation(s)
- V H Nguyen
- From the, Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - Y H Yeo
- From the, Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - B Zou
- From the, Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - M H Le
- From the, Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - L Henry
- From the, Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - R C Cheung
- Division of Gastroenterology and Hepatology, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - M H Nguyen
- From the, Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
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Raffa ML, Nguyen VH, Hernigou P, Flouzat-Lachaniette CH, Haiat G. Stress shielding at the bone-implant interface: Influence of surface roughness and of the bone-implant contact ratio. J Orthop Res 2021; 39:1174-1183. [PMID: 32852064 DOI: 10.1002/jor.24840] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 05/06/2020] [Accepted: 08/24/2020] [Indexed: 02/04/2023]
Abstract
Short and long-term stabilities of cementless implants are strongly determined by the interfacial load transfer between implants and bone tissue. Stress-shielding effects arise from shear stresses due to the difference of material properties between bone and the implant. It remains difficult to measure the stress field in periprosthetic bone tissue. This study proposes to investigate the dependence of the stress field in periprosthetic bone tissue on (i) the implant surface roughness, (ii) the material properties of bone and of the implant, (iii) the bone-implant contact ratio. To do so, a microscale two-dimensional finite element model of an osseointegrated bone-implant interface was developed where the surface roughness was modeled by a sinusoidal surface. The results show that the isostatic pressure is not affected by the presence of the bone-implant interface while shear stresses arise due to the combined effects of a geometrical singularity (for low surface roughness) and of shear stresses at the bone-implant interface (for high surface roughness). Stress-shielding effects are likely to be more important when the bone-implant contact ratio value is low, which corresponds to a case of relatively low implant stability. Shear stress reach a maximum value at a distance from the interface comprised between 0 and 0.1 time roughness wavelength λ and tend to 0 at a distance from the implant surface higher than λ, independently from bone-implant contact ratio and waviness ratio. A comparison with an analytical model allows validating the numerical results. Future work should use the present approach to model osseointegration phenomena.
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Affiliation(s)
- Maria Letizia Raffa
- Univ Paris Est Creteil, CNRS, MSME, Créteil, F-94010, France.,SUPMECA, EA 7393 QUARTZ Laboratory, Saint-Ouen 93407, France
| | - Vu-Hieu Nguyen
- Univ Paris Est Creteil, CNRS, MSME, Créteil, F-94010, France.,Univ Gustave Eiffel, MSME, Marne-la-Vallée, F-77454, France
| | - Philippe Hernigou
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est, Créteil, France.,INSERM U955, IMRB Université Paris-Est, Créteil, France
| | - Charles-Henri Flouzat-Lachaniette
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est, Créteil, France.,INSERM U955, IMRB Université Paris-Est, Créteil, France
| | - Guillaume Haiat
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208, Créteil, F-94010, France
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Kwak Y, Nguyen VH, Hériveaux Y, Belanger P, Park J, Haïat G. Ultrasonic assessment of osseointegration phenomena at the bone-implant interface using convolutional neural network. J Acoust Soc Am 2021; 149:4337. [PMID: 34241416 DOI: 10.1121/10.0005272] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 05/21/2021] [Indexed: 06/13/2023]
Abstract
Although endosseous implants are widely used in the clinic, failures still occur and their clinical performance depends on the quality of osseointegration phenomena at the bone-implant interface (BII), which are given by bone ingrowth around the BII. The difficulties in ensuring clinical reliability come from the complex nature of this interphase related to the implant surface roughness and the presence of a soft tissue layer (non-mineralized bone tissue) at the BII. The aim of the present study is to develop a method to assess the soft tissue thickness at the BII based on the analysis of its ultrasonic response using a simulation based-convolution neural network (CNN). A large-annotated dataset was constructed using a two-dimensional finite element model in the frequency domain considering a sinusoidal description of the BII. The proposed network was trained by the synthesized ultrasound responses and was validated by a separate dataset from the training process. The linear correlation between actual and estimated soft tissue thickness shows excellent R2 values equal to 99.52% and 99.65% and a narrow limit of agreement corresponding to [ -2.56, 4.32 μm] and [ -15.75, 30.35 μm] of microscopic and macroscopic roughness, respectively, supporting the reliability of the proposed assessment of osseointegration phenomena.
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Affiliation(s)
- Yunsang Kwak
- Centre National de la Recherche Scientifique, MSME, Université Paris-Est Créteil, Université Gustave Eiffel, F-94010 Creteil, France
| | - Vu-Hieu Nguyen
- University of Paris Est Creteil, Centre National de la Recherche Scientifique, Multiscale Simulation and Modeling Laboratory, F-94010 Creteil, France
| | - Yoann Hériveaux
- Centre National de la Recherche Scientifique, MSME, Université Paris-Est Créteil, Université Gustave Eiffel, F-94010 Creteil, France
| | - Pierre Belanger
- Department of Mechanical Engineering, École de Technologie Supérieure, 1100 Rue Notre-Dame O, Montreal, Quebec, H3C 1K3, Canada
| | - Junhong Park
- Department of Mechanical Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, 04763 Seoul, South Korea
| | - Guillaume Haïat
- Centre National de la Recherche Scientifique, MSME, Université Paris-Est Créteil, Université Gustave Eiffel, F-94010 Creteil, France
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Nguyen QB, Rios de Anda A, Versace DL, Langlois V, Perrot C, Nguyen VH, Naili S, Renard E. Design of macroporous photo-cationically cured resorcinol-based epoxy resins coupled to a solid template technique. J Polym Res 2021. [DOI: 10.1007/s10965-021-02517-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Hériveaux Y, Nguyen VH, Biwa S, Haïat G. Analytical modeling of the interaction of an ultrasonic wave with a rough bone-implant interface. Ultrasonics 2020; 108:106223. [PMID: 32771811 DOI: 10.1016/j.ultras.2020.106223] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 04/09/2020] [Accepted: 04/15/2020] [Indexed: 06/11/2023]
Abstract
Quantitative ultrasound can be used to characterize the evolution of the bone-implant interface (BII), which is a complex system due to the implant surface roughness and to partial contact between bone and the implant. The determination of the constitutive law of the BII would be of interest in the context of implant acoustical modeling in order to take into account the imperfect characteristics of the BII. The aim of the present study is to propose an analytical effective model describing the interaction between an ultrasonic wave and a rough BII. To do so, a spring model was considered to determine the equivalent stiffness K of the BII. The stiffness contributions related (i) to the partial contact between the bone and the implant and (ii) to the presence of soft tissues at the BII during the process of osseointegration were assessed independently. K was found to be comprised between 1013 and 1017 N/m3 depending on the roughness and osseointegration of the BII. Analytical values of the reflection and transmission coefficients at the BII were derived from values of K. A good agreement with numerical results obtained through finite element simulation was obtained. This model may be used for future finite element bone-implant models to replace the BII conditions.
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Affiliation(s)
- Yoann Hériveaux
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 94010 Créteil Cedex, France
| | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Créteil Cedex 94010, France
| | - Shiro Biwa
- Department of Aeronautics and Astronautics, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8540, Japan
| | - Guillaume Haïat
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 94010 Créteil Cedex, France.
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Nguyen TAH, Ngo HH, Guo WS, Nguyen TT, Vu ND, Soda S, Nguyen THH, Nguyen MK, Tran TVH, Dang TT, Nguyen VH, Cao TH. White hard clam (Meretrix lyrata) shells as novel filter media to augment the phosphorus removal from wastewater. Sci Total Environ 2020; 741:140483. [PMID: 32615439 DOI: 10.1016/j.scitotenv.2020.140483] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 06/20/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
It is well recognized that filter media play a crucial role in constructed wetlands (CWs) for decontamination of phosphorus (P)-rich wastewater. This study investigates the suitability of raw white hard clam shells (WHC) and white hard clam shells thermally modified at 800 °C (WHC-M800) as potential media to enhance P treatment performance in CWs. The results indicated that both WHC and WHC-M800 displayed appropriate physicochemical properties, such as high porosity, excellent hydraulic conductivity, and rich Ca content. WHC-M800 exhibited a superior P adsorption capacity (38.7 mg/g) to WHC (12.8 mg/g). However, the practical utilization of WHC-M800 as filter media in CWs may be compromised, due to certain limitations, for example: extremely high pH values in the post-adsorption solutions; high weight losses during calcination and adsorption processes; low mechanical strength; and intensive energy consumption. In contrast, the WHC demonstrated significant advantages of reasonably high P adsorption capacity, locally abundant availability, low cost, and marginal side effects. The fractionation of inorganic P of WHC and WHC-M800 revealed that Ca-bounded P was the most dominant binding form, followed by loosely bound P, Fe-P, occluded P, and Al-P. The present study demonstrates that recycling of WHC shells as a potential substrate in CWs provides a feasible method for upgrading P removal in CWs. Additionally, it helps to reduce waste WHC shells in a simple, cheap, and eco-friendly way, thus can double environmental benefits.
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Affiliation(s)
- T A H Nguyen
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - H H Ngo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia.
| | - W S Guo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology, Sydney, Broadway NSW 2007, Australia
| | - T T Nguyen
- Graduate School of Science and Engineering, Ritsumeikan University (RITs), Biwako-Kusatsu Campus, Shiga 525-8577, Japan
| | - N D Vu
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam; Center for Environmental Technology and Sustainable Development, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - S Soda
- Graduate School of Science and Engineering, Ritsumeikan University (RITs), Biwako-Kusatsu Campus, Shiga 525-8577, Japan
| | - T H H Nguyen
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - M K Nguyen
- University of Science (HUS), Vietnam National University, Hanoi (VNU), 334 Nguyen Trai Rd., Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - T V H Tran
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - T T Dang
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam
| | - V H Nguyen
- Research Center for Environmental Monitoring and Modeling, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
| | - T H Cao
- Vietnam Japan University (VJU), Vietnam National University, Hanoi (VNU), Luu Huu Phuoc St., Nam Tu Liem Dist., Hanoi 101000, Vietnam; Center for Environmental Technology and Sustainable Development, VNU University of Science (VNU-HUS), 334 Nguyen Trai Rd., Thanh Xuan Trung Ward, Thanh Xuan Dist., Hanoi 120106, Vietnam
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13
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Zou B, Yeo YH, Nguyen VH, Cheung R, Ingelsson E, Nguyen MH. Prevalence, characteristics and mortality outcomes of obese, nonobese and lean NAFLD in the United States, 1999-2016. J Intern Med 2020; 288:139-151. [PMID: 32319718 DOI: 10.1111/joim.13069] [Citation(s) in RCA: 134] [Impact Index Per Article: 33.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Revised: 03/08/2020] [Accepted: 03/27/2020] [Indexed: 12/15/2022]
Abstract
BACKGROUND Updated prevalence and outcome data for nonobese NAFLD for the multi-ethnic US population is limited. OBJECTIVES We aimed to investigate the prevalence, clinical characteristics and mortality of obese and nonobese individuals with NAFLD in the United Sates. METHODS A retrospective study was conducted using the 1999-2016 NHANES databases. We determined hazard ratio stratified by obesity status in NAFLD individuals using Cox regression and log-rank test. RESULTS Overall NAFLD prevalence was 32.3%: 22.7% were obese and 9.6% were nonobese, with increasing trend over time for obese NAFLD, but not nonobese NAFLD. Amongst those with NAFLD, 29.7% (95% CI: 27.8%-31.7%) were nonobese, of which 13.6% had lean NAFLD. Nonobese NAFLD was more common in older (40.9% if ≥ 65 vs. 24.2% if < 65 years), male (34.0% vs. 24.2%) and foreign-born Asian people (39.8% vs. 11.4%) and uncommon in black (11.5% vs 30-35% in other ethnicities, P < 0.001). Metabolic comorbidities were common in nonobese NAFLD individuals who also had more advanced fibrosis. Nonobese NAFLD individuals had higher 15-year cumulative all-cause mortality (51.7%) than obese NAFLD (27.2%) and non-NAFLD (20.7%) (P < 0.001). However, DM and fibrosis, but neither obese nor nonobese NAFLD compared to non-NAFLD was independently associated with higher mortality. CONCLUSION Nonobese NAFLD makes up about one-third of the NAFLD in the United States (even higher in older, male and foreign-born individuals) and carries higher mortality than obese NAFLD. Screening for NAFLD should be considered in high-risk groups even in the absence of obesity.
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Affiliation(s)
- B Zou
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - Y H Yeo
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - V H Nguyen
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
| | - R Cheung
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA.,Division of Gastroenterology and Hepatology, Veterans Affairs Medical Center, Palo Alto, CA, USA
| | - E Ingelsson
- Department of Medicine, Division of Cardiovascular Medicine, Stanford University School of Medicine, Stanford, CA, USA.,Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA.,Stanford Diabetes Research Center, Stanford University, Stanford, CA, USA
| | - M H Nguyen
- Division of Gastroenterology and Hepatology, Stanford University Medical Center, Palo Alto, CA, USA
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14
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Fox GJ, Nguyen VN, Dinh NS, Nghiem LPH, Le TNA, Nguyen TA, Nguyen BH, Nguyen HD, Tran NB, Nguyen TL, Le TN, Nguyen VH, Phan TL, Nguyen KC, Ho J, Pham DC, Britton WJ, Bestrashniy JRBM, Marks GB. Post-treatment Mortality Among Patients With Tuberculosis: A Prospective Cohort Study of 10 964 Patients in Vietnam. Clin Infect Dis 2020; 68:1359-1366. [PMID: 30202910 DOI: 10.1093/cid/ciy665] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Accepted: 08/14/2018] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Tuberculosis is the leading infectious cause of death. Steep reductions in tuberculosis-related mortality are required to realize the World Health Organization's "End Tuberculosis Strategy." However, accurate mortality estimates are lacking in many countries, particularly following discharge from care. This study aimed to establish the mortality rate among patients with pulmonary tuberculosis in Vietnam and to quantify the excess mortality in this population. METHODS We conducted a prospective cohort study among adult patients treated for smear-positive pulmonary tuberculosis in 70 clinics across Vietnam. People living in the same households were recruited as controls. Participants were re-interviewed and their survival was established at least 2 years after their treatment with an 8-month standardized regimen. The presence of relapse was established by linking identifying data on patients and controls to clinic registries. Verbal autopsies were performed. The cumulative mortality among patients was compared to that among a control population, adjusting for age and gender. RESULTS We enrolled 10964 patients and 25707 household controls. Among enrolled tuberculosis patients, 9% of patients died within a median follow-up period of 2.9 years: 342 (3.1%) during treatment and 637 (5.8%) after discharge. The standardized mortality ratio was 4.0 (95% confidence interval 3.7-4.2) among patients with tuberculosis, compared to the control population. Tuberculosis was the likely cause of death for 44.7% of these deceased patients. CONCLUSIONS Patients treated for tuberculosis had a markedly elevated risk of death, particularly in the post-treatment period. Interventions to reduce tuberculosis mortality must enhance the early detection of drug-resistance, improve treatment effectiveness, and address non-communicable diseases.
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Affiliation(s)
- G J Fox
- Faculty of Medicine and Health, University of Sydney, Australia.,Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - V N Nguyen
- National Lung Hospital, Ba Dinh, Hanoi, Vietnam
| | - N S Dinh
- National Lung Hospital, Ba Dinh, Hanoi, Vietnam
| | - L P H Nghiem
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - T N A Le
- National Lung Hospital, Ba Dinh, Hanoi, Vietnam
| | - T A Nguyen
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - B H Nguyen
- National Lung Hospital, Ba Dinh, Hanoi, Vietnam.,Centre for Operational Research, International Union Against Tuberculosis and Lung Disease, Paris, France
| | - H D Nguyen
- Pham Ngoc Thach Hospital, Ho Chi Minh City, Vietnam
| | - N B Tran
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - T L Nguyen
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - T N Le
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - V H Nguyen
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - T L Phan
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - K C Nguyen
- National Lung Hospital, Ba Dinh, Hanoi, Vietnam.,Hanoi Medical University, Hanoi, Vietnam
| | - J Ho
- Faculty of Medicine and Health, University of Sydney, Australia
| | - D C Pham
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia
| | - W J Britton
- Faculty of Medicine and Health, University of Sydney, Australia.,Centenary Institute of Cancer Medicine and Cell Biology, University of Sydney, Camperdown, New South Wales, Australia
| | | | - G B Marks
- Woolcock Institute of Medical Research, Glebe, New South Wales, Australia.,South Western Sydney Clinical School, University of New South Wales, Kensington, New South Wales, Australia
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15
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Hériveaux Y, Audoin B, Biateau C, Nguyen VH, Haïat G. Ultrasonic Propagation in a Dental Implant. Ultrasound Med Biol 2020; 46:1464-1473. [PMID: 32139153 DOI: 10.1016/j.ultrasmedbio.2020.01.025] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 12/23/2019] [Accepted: 01/23/2020] [Indexed: 06/10/2023]
Abstract
Ultrasound techniques can be used to characterize and stimulate dental implant osseointegration. However, the interaction between an ultrasonic wave and the implant-bone interface (IBI) remains unclear. This study-combining experimental and numerical approaches-investigates the propagation of an ultrasonic wave in a dental implant by assessing the amplitude of the displacements along the implant axis. An ultrasonic transducer was excited in a transient regime at 10 MHz. Laser interferometric techniques were employed to measure the amplitude of the displacements, which varied 3.2-8.9 nm along the implant axis. The results demonstrated the propagation of a guided wave mode along the implant axis. The velocity of the first arriving signal was equal to 2110 m.s-1, with frequency components lower than 1 MHz, in agreement with numerical results. Investigating guided wave propagation in dental implants should contribute to improved methods for the characterization and stimulation of the IBI.
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Affiliation(s)
- Yoann Hériveaux
- CNRS, Laboratoire Modélisation et Simulation Multi-Échelle, Créteil, France
| | - Bertrand Audoin
- CNRS, Institut de Mécanique et d'Ingénierie, Talence, France
| | | | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi-Échelle, Créteil, France
| | - Guillaume Haïat
- CNRS, Laboratoire Modélisation et Simulation Multi-Échelle, Créteil, France
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16
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Baron C, Nguyen VH, Naili S, Guivier-Curien C. Interaction of ultrasound waves with bone remodelling: a multiscale computational study. Biomech Model Mechanobiol 2020; 19:1755-1764. [DOI: 10.1007/s10237-020-01306-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 02/07/2020] [Indexed: 12/16/2022]
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17
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Hériveaux Y, Haïat G, Nguyen VH. Reflection of an ultrasonic wave on the bone-implant interface: Comparison of two-dimensional and three-dimensional numerical models. J Acoust Soc Am 2020; 147:EL32. [PMID: 32007013 DOI: 10.1121/10.0000500] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Accepted: 12/14/2019] [Indexed: 06/10/2023]
Abstract
Quantitative ultrasound is used to characterize osseointegration at the bone-implant interface (BII). However, the interaction between an ultrasonic wave and the implant remains poorly understood. Hériveaux, Nguyen, and Haiat [(2018). J. Acoust. Soc. Am. 144, 488-499] recently employed a two-dimensional (2D) model of a rough BII to investigate the sensitivity of the ultrasonic response to osseointegration. The present letter aimed at assessing the validity of the 2D assumption. The values of the reflection coefficient of the BII obtained with two and three-dimensional models were found not to be significantly different for implant roughness lower than 20 μm. 2D modeling is sufficient to describe the interaction between ultrasound and the BII.
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Affiliation(s)
- Yoann Hériveaux
- Centre National de la Recherche Scientifique, Laboratoire Modélisation et Simulation Multi Echelle, Unité Mixte de Recherche 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Guillaume Haïat
- Centre National de la Recherche Scientifique, Laboratoire Modélisation et Simulation Multi Echelle, Unité Mixte de Recherche 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, Unité Mixte de Recherche 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, , ,
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18
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Raffa ML, Nguyen VH, Haiat G. Micromechanical modeling of the contact stiffness of an osseointegrated bone-implant interface. Biomed Eng Online 2019; 18:114. [PMID: 31796076 PMCID: PMC6889538 DOI: 10.1186/s12938-019-0733-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Accepted: 11/21/2019] [Indexed: 12/20/2022] Open
Abstract
Background The surgical success of cementless implants is determined by the evolution of the biomechanical properties of the bone–implant interface (BII). One difficulty to model the biomechanical behavior of the BII comes from the implant surface roughness and from the partial contact between bone tissue and the implant. The determination of the constitutive law of the BII would be of interest in the context of implant finite element (FE) modeling to take into account the imperfect characteristics of the BII. The aim of the present study is to determine an effective contact stiffness \documentclass[12pt]{minimal}
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\begin{document}$$\left( {K_{c}^{\text{FEM}} } \right)$$\end{document}KcFEM of an osseointegrated BII accounting for its micromechanical features such as surface roughness, bone–implant contact ratio (BIC) and periprosthetic bone properties. To do so, a 2D FE model of the BII under normal contact conditions was developed and was used to determine the behavior of \documentclass[12pt]{minimal}
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\begin{document}$$K_{c}^{\text{FEM}}$$\end{document}KcFEM. Results The model is validated by comparison with three analytical schemes based on micromechanical homogenization including two Lekesiz’s models (considering interacting and non-interacting micro-cracks) and a Kachanov’s model. \documentclass[12pt]{minimal}
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\begin{document}$$K_{c}^{\text{FEM}}$$\end{document}KcFEM is found to be comprised between 1013 and 1015 N/m3 according to the properties of the BII. \documentclass[12pt]{minimal}
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\begin{document}$$K_{c}^{\text{FEM}}$$\end{document}KcFEM is shown to increase nonlinearly as a function of the BIC and to decrease as a function of the roughness amplitude for high BIC values (above around 20%). Moreover, \documentclass[12pt]{minimal}
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\begin{document}$$K_{c}^{\text{FEM}}$$\end{document}KcFEM decreases as a function of the roughness wavelength and increases linearly as a function of the Young’s modulus of periprosthetic bone tissue. Conclusions These results open new paths in implant biomechanical modeling since this model may be used in future macroscopic finite element models modeling the bone–implant system to replace perfectly rigid BII conditions. ![]()
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Affiliation(s)
- Maria Letizia Raffa
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME, UMR CNRS 8208, 61 Avenue du Général de Gaulle, 94010, Créteil, France
| | - Vu-Hieu Nguyen
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME, UMR CNRS 8208, 61 Avenue du Général de Gaulle, 94010, Créteil, France
| | - Guillaume Haiat
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME, UMR CNRS 8208, 61 Avenue du Général de Gaulle, 94010, Créteil, France.
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19
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Atopkin DM, Besprozvannykh VV, Ha DN, Nguyen VH, Nguyen VT. New species and new genus of Pseudohaploporinae (Digenea): Pseudohaploporus pusitestis sp. n. and Parahaploporus elegantus n. g., sp. n. (Digenea: Pseudohaploporinae) from Vietnamese mullet fish. Parasitol Int 2019; 75:102023. [PMID: 31715266 DOI: 10.1016/j.parint.2019.102023] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2019] [Revised: 11/04/2019] [Accepted: 11/07/2019] [Indexed: 11/17/2022]
Abstract
Two new species of Pseudohaploporinae, Pseudohaploporus pusitestis sp. n. and Parahaploporus elegantus n. g., sp. n., are described from intestines of the Vietnamese mullet fish Moolgarda seheli and Osteomugil cunnesius, respectively. Pseudohaploporus pusitestis sp. n. differs from two known Pseudohaploporus species, P. vietnamensis and P. planiliza, by the absence of a diverticulate hermaphroditic duct and muscular sphincters at the proximal end of the hermaphroditic sac. Metrically, P. pusitestis sp. n. is close to P. vietnamensis and differs from this species and from P. planilizum by lower maximum sizes of most parameters. Parahaploporus elegantus n. g., sp. differs from representatives of Pseudohaploporus by the presence of a single testis and the armament of hermaphroditic duct and is morphologically close to trematodes of the genus Haploporus. However, P. elegantus n. g differs from all known Haploporus species from mugilids of the Indo-West Pacific by the structure of the armament of the hermaphroditic duct and also by size of body, organs and eggs. The validity of designating two new species and a new genus of trematodes is supported by ITS and 28S rDNA sequence data. Phylogenetic reconstructions showed that the new trematodes belong to the Pseudohaploporinae, which formed a well-supported cluster within the monophyletic Haploporidae.
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Affiliation(s)
- D M Atopkin
- Federal Scientific Center of East Asia Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, 690022 Vladivostok, Russia; Department of Cell Biology and Genetics, Far Eastern Federal University, 690051, Ajax-10 str, Vladivostok, Russia.
| | - V V Besprozvannykh
- Federal Scientific Center of East Asia Terrestrial Biodiversity, Far Eastern Branch of Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - D N Ha
- Institute of Ecology and Biological Resources, Vietnamese Academy of Sciences and Technology, Hanoi, Viet Nam
| | - V H Nguyen
- Institute of Ecology and Biological Resources, Vietnamese Academy of Sciences and Technology, Hanoi, Viet Nam
| | - V T Nguyen
- Hai Duong Medical Technical University, Hanoi, Viet Nam
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20
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Abstract
The stress distribution around endosseous implants is an important determinant of the surgical success. However, no method developed so far to determine the implant stability is sensitive to the loading conditions of the bone-implant interface (BII). The objective of this study is to investigate whether a quantitative ultrasound (QUS) technique may be used to retrieve information on compressive stresses applied to the BII. An acousto-mechanical device was conceived to compress 18 trabecular bovine bone samples onto coin-shaped implants and to measure the ultrasonic response of the BII during compression. The biomechanical behavior of the trabecular bone samples was modeled as Neo-Hookean. The reflection coefficient of the BII was shown to decrease as a function of the stress during the elastic compression of the trabecular bone samples and during the collapse of the trabecular network, with an average slope of −4.82 GPa−1. The results may be explained by an increase of the bone-implant contact ratio and by changes of bone structure occurring during compression. The sensitivity of the QUS response of the BII to compressive stresses opens new paths in the elaboration of patient specific decision support systems allowing surgeons to assess implant stability that should be developed in the future.
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Affiliation(s)
- Yoann Hériveaux
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010, Créteil Cedex, France
| | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010, Créteil Cedex, France
| | - Didier Geiger
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010, Créteil Cedex, France
| | - Guillaume Haïat
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010, Créteil Cedex, France.
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21
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Raffa ML, Nguyen VH, Tabor E, Immel K, Housset V, Flouzat-Lachaniette CH, Haiat G. Dependence of the primary stability of cementless acetabular cup implants on the biomechanical environment. Proc Inst Mech Eng H 2019; 233:1237-1249. [DOI: 10.1177/0954411919879250] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Biomechanical phenomena occurring at the bone–implant interface during the press-fit insertion of acetabular cup implants are still poorly understood. This article presents a nonlinear geometrical two-dimensional axisymmetric finite element model aiming at describing the biomechanical behavior of the acetabular cup implant as a function of the bone Young’s modulus Eb, the diametric interference fit ( IF), and the friction coefficient µ. The numerical model was compared with experimental results obtained from an in vitro test, which allows to determine a reference configuration with the parameter set: μ* = 0.3, [Formula: see text], and IF* = 1 mm for which the maximal contact pressure tN = 10.7 MPa was found to be localized at the peri-equatorial rim of the acetabular cavity. Parametric studies were carried out, showing that an optimal value of the pull-out force can be defined as a function of μ, Eb, and IF. For the reference configuration, the optimal pull-out force is obtained for μ = 0.6 (respectively, Eb = 0.35 GPa and IF = 1.4 mm). For relatively low value of µ ( µ < 0.2), the optimal value of IF linearly increases as a function of µ independently of Eb, while for µ > 0.2, the optimal value of IF has a nonlinear dependence on µ and decreases as a function of Eb. The results can be used to help surgeons determine the optimal value of IF in a patient specific manner.
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Affiliation(s)
- Maria Letizia Raffa
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Créteil, France
| | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Créteil, France
| | - Elisabeth Tabor
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Créteil, France
| | - Katharina Immel
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Créteil, France
- Aachen Institute for Advanced Study in Computational Engineering Science (AICES), RWTH Aachen University, Aachen, Germany
| | - Victor Housset
- Service de Chirurgie Orthopédique et Traumatologique du Centre Hospitalier Universitaire Henri Mondor, Créteil, France
- Équipe 10, Groupe 5, IMRB U955, INSERM/UPEC, Créteil, France
| | - Charles-Henri Flouzat-Lachaniette
- Service de Chirurgie Orthopédique et Traumatologique du Centre Hospitalier Universitaire Henri Mondor, Créteil, France
- Équipe 10, Groupe 5, IMRB U955, INSERM/UPEC, Créteil, France
| | - Guillaume Haiat
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, Créteil, France
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22
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Morisot F, Nguyen VH, Montemont C, Maindron T, Muñoz-Rojas D, Mouis M, Langlet M, Ternon C. Al 2O 3, Al doped ZnO and SnO 2 encapsulation of randomly oriented ZnO nanowire networks for high performance and stable electrical devices. Nanotechnology 2019; 30:385202. [PMID: 31212261 DOI: 10.1088/1361-6528/ab2aa5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Two-dimensional randomly oriented nanowire (NW) networks, also called nanonets (NNs), have remarkable advantages including low-cost integration, good reproducibility and high sensitivity, which make them a promising material for electronic devices. With this work, we focus on the study of ZnO NNs as channel materials in field effect transistors (FETs). In our process, ZnO NWs were assembled in NNs by the liquid filtration method and were integrated in transistors, with the bottom-gate configuration, using simple technological steps. Non-encapsulated devices exhibited state of the art performances but their stability toward air exposure was poor. Using a proper encapsulation of the nanonets, with cheap, abundant and non-toxic oxides, we demonstrate our ability not only to stabilize their electrical properties, but also to enhance performance to values never reach before for ZnO NW-based transistors. Our best FETs exhibit a low Off-current while maintaining a very good On-current, which results in a I on/I off ratio exceeding 106 for a drain voltage of 5 V. The behavior of these ZnO NN-based FETs was studied for three different encapsulation materials, alumina (Al2O3), tin oxide (SnO2) and Al-doped ZnO (AZO). These results prove that ZnO NNs are highly promising materials for an easy and low-cost integration into FETs.
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Affiliation(s)
- F Morisot
- Univ. Grenoble Alpes, CNRS, Grenoble INP*, LMGP, F-38000 Grenoble, France. Univ. Grenoble Alpes, CNRS, Grenoble INP*, IMEP-LaHC, F-38000 Grenoble, France
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Gorbushin N, Nguyen VH, Naili S. Design Optimisation of Acoustic Absorbers with Cross-Like Pores Via a Homogenisation Method. ACTA ACUST UNITED AC 2019. [DOI: 10.3813/aaa.919344] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Mechanical modelling and associated numerical methods are able to improve the design of absorbing materials which are otherwise difficult to accomplish through experimental studies only. In this paper, we provide an original procedure for obtaining high acoustic absorption of single
and multi-layered panels with predefined microstructure. The procedure uses the homogenisation technique for obtaining effective properties of an airsaturated material and solution to acoustic problems. We study a certain topology of the material and point out the effect of matrix material
stiffness on the results of the optimisation procedure. We demonstrate that for stiff and rigid frames of a single layer, the optimal design parameters do not differ much whereas for the soft frames, the same results may significantly change. Moreover, we show that the absorption properties
can be essentially improved by arrangements of different materials (soft, stiff and air) in sandwich panels. It is also possible to design a material which efficiently absorbs acoustic energy at low frequencies which is hard to achieve by means of conventional materials.
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Tran TNHT, Sacchi MD, Ta D, Nguyen VH, Lou E, Le LH. Nonlinear Inversion of Ultrasonic Dispersion Curves for Cortical Bone Thickness and Elastic Velocities. Ann Biomed Eng 2019; 47:2178-2187. [PMID: 31218488 DOI: 10.1007/s10439-019-02310-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 06/12/2019] [Indexed: 11/30/2022]
Abstract
In this study, a nonlinear grid-search inversion has been developed to estimate the thickness and elastic velocities of long cortical bones, which are important determinants of bone strength, from axially-transmitted ultrasonic data. The inversion scheme is formulated in the dispersive frequency-phase velocity domain to recover bone properties. The method uses ultrasonic guided waves to retrieve overlying soft tissue thickness, cortical thickness, compressional, and shear-wave velocities of the cortex. The inversion strategy requires systematic examination of a large set of trial dispersion-curve solutions within a pre-defined model space to match the data with minimum cost in a least-squares sense. The theoretical dispersion curves required to solve the inverse problem are computed for bilayered bone models using a semi-analytical finite-element method. The feasibility of the proposed approach was demonstrated by the numerically simulated data for a 1 mm soft tissue-5 mm bone bilayer and ex-vivo data from a bovine femur plate with an overlying 2 mm-thick soft-tissue mimic. The bootstrap method was employed to evaluate the inversion uncertainty and stability. Our results have shown that the cortical thickness and wave speeds could be recovered with fair accuracy.
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Affiliation(s)
- Tho N H T Tran
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, AB, T6G 2B7, Canada
| | - Mauricio D Sacchi
- Department of Physics, University of Alberta, Edmonton, AB, T6G 2E1, Canada
| | - Dean Ta
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, AB, T6G 2B7, Canada.,State Key Laboratory of ASIC and System, Fudan University, Shanghai, China.,Department of Electronic Engineering, Fudan University, Shanghai, China
| | - Vu-Hieu Nguyen
- Laboratoire Modélisation et Simulation Multi Echelle UMR 8208 CNRS, Université Paris-Est, Créteil, France
| | - Edmond Lou
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, AB, T6G 2B7, Canada.,Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, T6G 2W3, Canada
| | - Lawrence H Le
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, AB, T6G 2B7, Canada. .,Department of Physics, University of Alberta, Edmonton, AB, T6G 2E1, Canada. .,State Key Laboratory of ASIC and System, Fudan University, Shanghai, China.
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Hériveaux Y, Nguyen VH, Brailovski V, Gorny C, Haïat G. Reflection of an ultrasonic wave on the bone-implant interface: Effect of the roughness parameters. J Acoust Soc Am 2019; 145:3370. [PMID: 31255165 DOI: 10.1121/1.5109668] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 05/10/2019] [Indexed: 06/09/2023]
Abstract
Quantitative ultrasound can be used to characterize the evolution of the bone-implant interface (BII), which is a complex system due to the implant surface roughness and to partial contact between bone and the implant. The aim of this study is to derive the main determinants of the ultrasonic response of the BII during osseointegration phenomena. The influence of (i) the surface roughness parameters and (ii) the thickness W of a soft tissue layer on the reflection coefficient r of the BII was investigated using a two-dimensional finite element model. When W increases from 0 to 150 μm, r increases from values in the range [0.45; 0.55] to values in the range [0.75; 0.88] according to the roughness parameters. An optimization method was developed to determine the sinusoidal roughness profile leading to the most similar ultrasonic response for all values of W compared to the original profile. The results show that the difference between the ultrasonic responses of the optimal sinusoidal profile and of the original profile was lower to typical experimental errors. This approach provides a better understanding of the ultrasonic response of the BII, which may be used in future numerical simulation realized at the scale of an implant.
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Affiliation(s)
- Yoann Hériveaux
- CNRS, Laboratoire Modélisation et Simulation Multi-Échelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Vladimir Brailovski
- Department of Mechanical Engineering, École de technologie supérieure, 1100 Notre-Dame Street West, Montreal, Quebec H3C 1K3, Canada
| | - Cyril Gorny
- Laboratoire PIMM (ENSAM, CNRS, CNAM, Hesam Université), 151 Bd de l'Hôpital 75013 Paris (ENSAM), France
| | - Guillaume Haïat
- CNRS, Laboratoire Modélisation et Simulation Multi-Échelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
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Nguyen TNT, Ha DV, Do TNN, Nguyen VH, Ngo XT, Phan VH, Nguyen ND, Bui QH. Air pollution monitoring network using low-cost sensors, a case study in Hanoi, Vietnam. ACTA ACUST UNITED AC 2019. [DOI: 10.1088/1755-1315/266/1/012017] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Maß TWW, Nguyen VH, Schnakenberg U, Taubner T. Tailoring grating strip widths for optimizing infrared absorption signals of an adsorbed molecular monolayer. Opt Express 2019; 27:10524-10532. [PMID: 31052910 DOI: 10.1364/oe.27.010524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 02/26/2019] [Indexed: 06/09/2023]
Abstract
Metal structures with resonances in the mid-infrared spectral range enable an increased sensitivity for detecting molecular vibrational signals. 1D gold strip gratings have already proven potential in surface-enhanced infrared absorption (SEIRA) experiments, as grating resonances and local electric field enhancement can be spectrally tuned by changing the grating period. Here, we identify the grating strip width as another important design parameter, which is investigated for further optimization of molecular absorption signal enhancement in SEIRA experiments. Previous literature used gratings to increase light absorption in relatively thick polymer layers. Here, we demonstrate the capability of gold strip gratings fabricated on a CaF2 substrate to enhance the CH2 vibrational modes of a thiol-based monolayer of MHDA. An optimal choice of the strip width w = 1.33 μm enables a maximum vibrational signal enhancement factor of around 84, when normalized to microscopic GIR measurements of an MHDA monolayer on an extended gold surface. Numerical simulations demonstrate the broadband local field enhancement of gold strip gratings, which are suitable for enhancing multiple vibrational modes in a large hot-spot volume.
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Hériveaux Y, Nguyen VH, Haïat G. Reflection of an ultrasonic wave on the bone-implant interface: A numerical study of the effect of the multiscale roughness. J Acoust Soc Am 2018; 144:488. [PMID: 30075648 DOI: 10.1121/1.5046524] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 06/28/2018] [Indexed: 06/08/2023]
Abstract
Quantitative ultrasound is used to characterize and stimulate osseointegration processes at the bone-implant interface (BII). However, the interaction between an ultrasonic wave and the implant remains poorly understood. This study aims at investigating the sensitivity of the ultrasonic response to the microscopic and macroscopic properties of the BII and to osseointegration processes. The reflection coefficient R of the BII was modeled for different frequencies using a two-dimensional finite element model. The implant surface roughness was modeled by a sinusoidal function with varying amplitude h and spatial frequency L. A soft tissue layer of thickness W was considered between bone tissue and the implant in order to model non-mineralized fibrous tissue. For microscopic roughness, R is shown to increase from around 0.55 until 0.9 when kW increases from 0 to 1 and to be constant for kW > 1, where k is the wavenumber in the implant. These results allow us to show that R depends on the properties of bone tissue located at a distance comprised between 1 and 25 μm from the implant surface. For macroscopic roughness, R is highly dependent on h and this dependence may be explained by phase cancellation and multiple scattering effects for high roughness parameters.
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Affiliation(s)
- Yoann Hériveaux
- CNRS, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR, 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Guillaume Haïat
- CNRS, Laboratoire Modélisation et Simulation Multi-Échelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
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Nguyen VH, Kalal M, Suk H, Janulewicz KA. Interferometric analysis of sub-nanosecond laser-induced optical breakdown dynamics in the bulk of fused-silica glass. Opt Express 2018; 26:14999-15008. [PMID: 30114753 DOI: 10.1364/oe.26.014999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Accepted: 05/05/2018] [Indexed: 06/08/2023]
Abstract
Dynamics of laser-induced optical breakdown in the bulk of fused-silica glass irradiated by a sub-nanosecond laser pulse at a wavelength of 790 nm with a fluence of 522 J/cm2 was studied by the femtosecond time-resolved complex interferometry in Nomarski arrangement utilising a Fresnel bi-prism. Evolution of the plasma channel and the development of the free electron density were in focus of the investigation. The measured ultimate length of the plasma channel was equal to 30 μm and almost doubled the length estimated within the moving breakdown model. The history of the transient electron density distribution in the plasma was reconstructed from the phase shift maps using the inverse Abel transform and it revealed further deviation from this model. The core of the plasma channel exhibited at the last stages of the development a considerable level of the electron density up to 2.4×1020 cm-3. The signature of the pre-breakdown phase has been identified as radiation caused by ionization-released electrons interacting with ions and has been demonstrated in solids for the first time in this way. Origin of the discrepancy between the theoretical prediction of the moving breakdown model and the measured values of the channel length is discussed as well.
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Bosc R, Tijou A, Rosi G, Nguyen VH, Meningaud JP, Hernigou P, Flouzat-Lachaniette CH, Haiat G. Influence of soft tissue in the assessment of the primary fixation of acetabular cup implants using impact analyses. Clin Biomech (Bristol, Avon) 2018; 55:7-13. [PMID: 29625357 DOI: 10.1016/j.clinbiomech.2018.03.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 02/08/2018] [Accepted: 03/19/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND The acetabular cup (AC) implant primary stability is an important determinant for the success of cementless hip surgery but it remains difficult to assess the AC implant fixation in the clinic. A method based on the analysis of the impact produced by an instrumented hammer on the ancillary has been developed by our group (Michel et al., 2016a). However, the soft tissue thickness present around the acetabulum may affect the impact response, which may hamper the robustness of the method. The aim of this study is to evaluate the influence of the soft tissue thickness (STT) on the acetabular cup implant primary fixation evaluation using impact analyses. METHODS To do so, different AC implants were inserted in five bovine bone samples. For each sample, different stability conditions were obtained by changing the cavity diameter. For each configuration, the AC implant was impacted 25 times with 10 and 30 mm of soft tissues positioned underneath the sample. The averaged indicator Im was determined based on the amplitude of the signal for each configuration and each STT and the pull-out force was measured. FINDINGS The results show that the resonance frequency of the system increases when the value of the soft tissue thickness decreases. Moreover, an ANOVA analysis shows that there was no significant effect of the value of soft tissue thickness on the values of the indicator Im (F = 2.33; p-value = 0.13). INTERPRETATION This study shows that soft tissue thickness does not appear to alter the prediction of the acetabular cup implant primary fixation obtained using the impact analysis approach, opening the path towards future clinical trials.
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Affiliation(s)
- Romain Bosc
- NSERM U955, Team 16, Créteil, France; Vaccine Research Institute (VRI), Faculté de Médecine, Créteil, France; Université Paris Est, Créteil, France; Hopital Henri Mondor, Plastic, Reconstructive, Aesthetic and Maxillofacial Surgery Department, 50, avenue du Maréchal de Lattre de Tassigny, 94000 Créteil, France.
| | - Antoine Tijou
- CNRS, Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208, 61 Avenue du Général de Gaulle, Créteil 94010, France
| | - Giuseppe Rosi
- CNRS, Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208, 61 Avenue du Général de Gaulle, Créteil 94010, France
| | - Vu-Hieu Nguyen
- CNRS, Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208, 61 Avenue du Général de Gaulle, Créteil 94010, France
| | - Jean-Paul Meningaud
- Hopital Henri Mondor, Plastic, Reconstructive, Aesthetic and Maxillofacial Surgery Department, 50, avenue du Maréchal de Lattre de Tassigny, 94000 Créteil, France
| | - Philippe Hernigou
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est, 51 avenue du Maréchal de Lattre de Tassigny, 94000 Créteil, France
| | - Charles-Henri Flouzat-Lachaniette
- Service de Chirurgie Orthopédique et Traumatologique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est, 51 avenue du Maréchal de Lattre de Tassigny, 94000 Créteil, France; Équipe 10, Groupe 5, IMRB U955, INSERM/UPEC, 51 Avenue du Maréchal de Lattre de Tassigny, 94010 Créteil, France
| | - Guillaume Haiat
- CNRS, Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208, 61 Avenue du Général de Gaulle, Créteil 94010, France
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Tran TNHT, Le LH, Sacchi MD, Nguyen VH. Sensitivity analysis of ultrasonic guided waves propagating in trilayered bone models: a numerical study. Biomech Model Mechanobiol 2018; 17:1269-1279. [DOI: 10.1007/s10237-018-1025-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 04/29/2018] [Indexed: 11/28/2022]
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Vayron R, Nguyen VH, Lecuelle B, Haiat G. Evaluation of dental implant stability in bone phantoms: Comparison between a quantitative ultrasound technique and resonance frequency analysis. Clin Implant Dent Relat Res 2018; 20:470-478. [PMID: 29770562 DOI: 10.1111/cid.12622] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 02/22/2018] [Accepted: 04/17/2018] [Indexed: 12/22/2022]
Abstract
BACKGROUND Resonance frequency analyses and quantitative ultrasound methods have been suggested to assess dental implant primary stability. PURPOSE The purpose of this study was to compare the results obtained using these two techniques applied to the same dental implants inserted in various bone phantoms. MATERIALS AND METHODS Different values of trabecular bone density and cortical thickness were considered to assess the effect of bone quality on the respective indicators (UI and ISQ). The effect of the implant insertion depth and of the final drill diameter was also investigated. RESULTS ISQ values increase and UI values decrease as a function of trabecular density, cortical thickness and the screwing of the implant. When the implant diameter varies, the UI values are significantly different for all final drill diameters (except for two), while the ISQ values are similar for all final drill diameters lower than 3.2 mm and higher than 3.3 mm. The error on the estimation of parameters with the QUS device is between 4 and 8 times lower compared to that made with the RFA technique. CONCLUSIONS The results show that ultrasound technique provides a better estimation of different parameters related to the implant stability compared to the RFA technique.
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Affiliation(s)
- Romain Vayron
- CNRS, Laboratoire Modélisation et Simulation MultiEchelle, MSME UMR CNRS 8208, 61, Avenue du Général de Gaulle, 94010 Créteil, Cedex, France
| | - Vu-Hieu Nguyen
- CNRS, Laboratoire Modélisation et Simulation MultiEchelle, MSME UMR CNRS 8208, 61, Avenue du Général de Gaulle, 94010 Créteil, Cedex, France
| | - Benoît Lecuelle
- Centre de Recherche BioMédicale, Ecole Nationale Vétérinaire d'Alfort, 7 Avenue du Général de Gaulle, 94700 Maisons-Alfort, France
| | - Guillaume Haiat
- CNRS, Laboratoire Modélisation et Simulation MultiEchelle, MSME UMR CNRS 8208, 61, Avenue du Général de Gaulle, 94010 Créteil, Cedex, France
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Affiliation(s)
- V H Nguyen
- Public Health Program, Department of Health Sciences, School of Health Professions, University of Missouri, Columbia, MO, USA.
- Community Health Program, Nursing Department, School of Natural Sciences & Mathematics, Columbia College of Missouri, Columbia, MO, USA.
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Nagatani Y, Guipieri S, Nguyen VH, Chappard C, Geiger D, Naili S, Haїat G. Three-dimensional Simulation of Quantitative Ultrasound in Cancellous Bone Using the Echographic Response of a Metallic Pin. Ultrason Imaging 2017; 39:295-312. [PMID: 28492108 DOI: 10.1177/0161734617698648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Degenerative discopathy is a common pathology that may require spine surgery. A metallic cylindrical pin is inserted into the vertebral body to maintain soft tissues and may be used as a reflector of ultrasonic wave to estimate bone density. The first aim of this paper is to validate a three-dimensional (3-D) model to simulate the ultrasonic propagation in a trabecular bone sample in which a metallic pin has been inserted. We also aim at determining the effect of changes of bone volume fraction (BV/TV) and of positioning errors on the quantitative ultrasound (QUS) parameters in this specific configuration. The approach consists in coupling finite-difference time-domain simulation with X-ray microcomputed tomography. The correlation coefficient between experimental and simulated speed of sound (SOS)-respectively, broadband ultrasonic attenuation (BUA)-was equal to 0.90 (respectively, 0.55). The results show a significant correlation of SOS with BV/TV ( R = 0.82), while BUA values exhibit a nonlinear behavior versus BV/TV. The orientation of the pin should be controlled with an accuracy of around 1° to obtain accurate results. The results indicate that using the ultrasonic wave reflected by a pin has a potential to estimate the bone density. SOS is more reliable than BUA due to its lower sensitivity to the tilt angle.
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Affiliation(s)
- Yoshiki Nagatani
- 1 Department of Electronics, Kobe City College of Technology, Kobe, Japan
- 2 Laboratoire de Modélisation et Simulation Multi Echelle, UMR CNRS 8208, Université Paris-Est, Créteil, France
| | - Séraphin Guipieri
- 2 Laboratoire de Modélisation et Simulation Multi Echelle, UMR CNRS 8208, Université Paris-Est, Créteil, France
| | - Vu-Hieu Nguyen
- 2 Laboratoire de Modélisation et Simulation Multi Echelle, UMR CNRS 8208, Université Paris-Est, Créteil, France
| | | | - Didier Geiger
- 2 Laboratoire de Modélisation et Simulation Multi Echelle, UMR CNRS 8208, Université Paris-Est, Créteil, France
| | - Salah Naili
- 2 Laboratoire de Modélisation et Simulation Multi Echelle, UMR CNRS 8208, Université Paris-Est, Créteil, France
| | - Guillaume Haїat
- 4 CNRS, Laboratoire de Modélisation et Simulation Multi Echelle, UMR CNRS 8208, Créteil, France
- 5 École de technologie supérieure, Montreal, QC, Canada
- 6 Research Center, Hôpital du Sacré-Cœur de Montréal, Montreal, QC, Canada
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Nguyen VH, Rosi G, Naili S, Michel A, Raffa ML, Bosc R, Meningaud JP, Chappard C, Takano N, Haiat G. Influence of anisotropic bone properties on the biomechanical behavior of the acetabular cup implant: a multiscale finite element study. Comput Methods Biomech Biomed Engin 2017; 20:1312-1325. [PMID: 28768422 DOI: 10.1080/10255842.2017.1357703] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Although the biomechanical behavior of the acetabular cup (AC) implant is determinant for the surgical success, it remains difficult to be assessed due to the multiscale and anisotropic nature of bone tissue. The aim of the present study was to investigate the influence of the anisotropic properties of peri-implant trabecular bone tissue on the biomechanical behavior of the AC implant at the macroscopic scale. Thirteen bovine trabecular bone samples were imaged using micro-computed tomography (μCT) with a resolution of 18 μm. The anisotropic biomechanical properties of each sample were determined at the scale of the centimeter based on a dedicated method using asymptotic homogenization. The material properties obtained with this multiscale approach were used as input data in a 3D finite element model to simulate the macroscopic mechanical behavior of the AC implant under different loading conditions. The largest stress and strain magnitudes were found around the equatorial rim and in the polar area of the AC implant. All macroscopic stiffness quantities were significantly correlated (R2 > 0.85, p < 6.5 e-6) with BV/TV (bone volume/total volume). Moreover, the maximum value of the von Mises stress field was significantly correlated with BV/TV (R2 > 0.61, p < 1.6 e-3) and was always found at the bone-implant interface. However, the mean value of the microscopic stress (at the scale of the trabeculae) decrease as a function of BV/TV for vertical and torsional loading and do not depend on BV/TV for horizontal loading. These results highlight the importance of the anisotropic properties of bone tissue.
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Affiliation(s)
- Vu-Hieu Nguyen
- a Laboratoire de Modélisation et de Simulation MultiEchelle, UMR CNRS 8208 , Université Paris-Est , Créteil , France
| | - Giuseppe Rosi
- a Laboratoire de Modélisation et de Simulation MultiEchelle, UMR CNRS 8208 , Université Paris-Est , Créteil , France
| | - Salah Naili
- a Laboratoire de Modélisation et de Simulation MultiEchelle, UMR CNRS 8208 , Université Paris-Est , Créteil , France
| | - Adrien Michel
- a Laboratoire de Modélisation et de Simulation MultiEchelle, UMR CNRS 8208 , Université Paris-Est , Créteil , France
| | - Maria-Letizia Raffa
- a Laboratoire de Modélisation et de Simulation MultiEchelle, UMR CNRS 8208 , Université Paris-Est , Créteil , France
| | - Romain Bosc
- b INSERM U955 , Université Paris-Est , Créteil , France
| | | | - Christine Chappard
- c Laboratoire Bioingénierie Biomécanique Ostéo-Articulaires, UMR CNRS 7052 , Université Paris Diderot , Paris , France
| | - Naoki Takano
- d Faculty of Science and Engineering, Department of Mechanical Engineering , Keio University , Yokohama , Japan
| | - Guillaume Haiat
- e Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208 , Créteil , France.,f École de technologie supérieure , Montreal , Canada.,g Research Center, Hôpital du Sacré-Cœur de Montréal , Montreal , Canada
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Nguyen VH, Tran TN, Sacchi MD, Naili S, Le LH. Computing dispersion curves of elastic/viscoelastic transversely-isotropic bone plates coupled with soft tissue and marrow using semi-analytical finite element (SAFE) method. Comput Biol Med 2017; 87:371-381. [DOI: 10.1016/j.compbiomed.2017.06.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 05/31/2017] [Accepted: 06/02/2017] [Indexed: 11/30/2022]
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Michel A, Nguyen VH, Bosc R, Vayron R, Hernigou P, Naili S, Haiat G. Finite element model of the impaction of a press-fitted acetabular cup. Med Biol Eng Comput 2016; 55:781-791. [PMID: 27491803 DOI: 10.1007/s11517-016-1545-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 07/03/2016] [Indexed: 01/07/2023]
Abstract
Press-fit surgical procedures aim at providing primary stability to acetabular cup (AC) implants. Impact analysis constitutes a powerful approach to retrieve the AC implant insertion properties. The aim of this numerical study was to investigate the dynamic interaction occurring between the hammer, the ancillary and bone tissue during the impact and to assess the potential of impact analysis to retrieve AC implant insertion conditions. A dynamic two-dimensional axisymmetric model was developed to simulate the impaction of the AC implant into bone tissue assuming friction at the bone-implant interface and large deformations. Different values of interference fit (from 0.5 to 2 mm) and impact velocities (from 1 to 2 m.s-1) were considered. For each configuration, the variation of the force applied between the hammer and the ancillary was analyzed and an indicator I was determined based on the impact momentum of the signal. The simulated results are compared to the experiments. The value of the polar gap decreases with the impact velocity and increases with the interference fit. The bone-implant contact area was significantly correlated with the resonance frequency (R 2 = 0.94) and the indicator (R 2 = 0.95). The results show the potential of impact analyses to retrieve the bone-implant contact properties.
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Affiliation(s)
- Adrien Michel
- Université Paris Est, Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208, 61 avenue du Général de Gaulle, 94010, Créteil, France
| | - Vu-Hieu Nguyen
- Université Paris Est, Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208, 61 avenue du Général de Gaulle, 94010, Créteil, France
| | - Romain Bosc
- Service de Chirurgie Plastique et Reconstructive, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est, 51 avenue du Maréchal de Lattre de Tassigny, 94000, Créteil, France
| | - Romain Vayron
- Université Paris Est, Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208, 61 avenue du Général de Gaulle, 94010, Créteil, France
| | - Philippe Hernigou
- Service de Chirurgie Orthopédique, Hôpital Henri Mondor AP-HP, CHU Paris 12, Université Paris-Est, 51 avenue du Maréchal de Lattre de Tassigny, 94000, Créteil, France
| | - Salah Naili
- Université Paris Est, Laboratoire de Modélisation et de Simulation Multi-Echelle, UMR CNRS 8208, 61 avenue du Général de Gaulle, 94010, Créteil, France
| | - Guillaume Haiat
- CNRS, Laboratoire de Modélisation et de Simulation Multi‑Echelle, UMR CNRS 8208, 61 avenue du Général de Gaulle, 94010, Créteil, France.
- École de technologie supérieure, 1100 Notre-Dame Street West, Montreal, QC, H3C 1K3, Canada.
- Research Center, Hôpital du Sacré-Cœur de Montréal, 5400, Gouin Boul. West, Montreal, QC, H4J 1C5, Canada.
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Nguyen VH, Nguyen VL, Hoang NS, Do TK. Effect of cell membrane permeability protein on porcine oocyte vitrification. Cryo Letters 2016; 37:103-109. [PMID: 27224521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
BACKGROUND The discovery of proteins with inherent cell membrane-translocating activity will expand our ability to study and manipulate various intracellular processes in living systems. OBJECTIVE We investigated the effect of TAT-EGFP (trans-activator of transcription-enhanced green fluorescent protein) intra-cellular delivery on the survival and development of mature porcine oocytes after cryopreservasion. MATERIALS AND METHODS Cumulus-oocyte complexes (COCs) collected from follicles 3 to 6 mm in diameter in abattoir-derived oocytesries of prepubertal gilts were on vitro matured (IVM). After IVM, the oocytes were used for TAT-EGFP delivery test and cryopreservation with and without TAT-EGFP supplementation. Oocyte viability was assayed by staining with fluorescein diacetate. Live oocytes were parthened and cultured in vitro, to assess their ability to be activated and to therefore develop. RESULTS The results show that the TAT-EGFP was well delivered into the nuclear of the Hela cell and oocytes also. In the medium toxic test, the proportion of viable oocytes in seven groups showed no significance. In vitrification experiments, the viability of oocytes in group supplemented with TAT-EGFP was significantly higher than that in the without TAT-EGFP group and the control groups (27.7%, 90.4%, and 100%, respectively). Among the three groups, the developmental abilities of oocytes in the supplement TAT-EGFP, EGFP and Control groups revealed that the vitrified group had a significantly reduced ability to undergo first cleavage (34.4%, 63.3%, and 69.0%, respectively). CONCLUSION the supplement of TAT-EGFP protein into vitrification medium does not affect the viability of the oocytes whereas it improved the viability and developmental potential of oocytes after it was vitrified.
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Affiliation(s)
- V H Nguyen
- Laboratory of Embryo Biotechnology, Institute of Biotechnology, Vietnam Academy of Science and Technology, Hanoi, Vietnam.
| | - V L Nguyen
- Laboratory of Embryo Biotechnology, Institute of Biotechnology, Vietnam Academy of Science and Technology, Hanoi, Vietnam
| | - N S Hoang
- Department of Animal Biotechnology, Institute of Tropical Biology, Vietnam Academy of Science and Technology, Ho Chi Minh City, Vietnam
| | - T K Do
- Fisheries College, Tuson District, Bacninh Province, Vietnam
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Vayron R, Nguyen VH, Bosc R, Naili S, Haïat G. Assessment of the biomechanical stability of a dental implant with quantitative ultrasound: A three-dimensional finite element study. J Acoust Soc Am 2016; 139:773-780. [PMID: 26936559 DOI: 10.1121/1.4941452] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Dental implant stability is an important determinant of the surgical success. Quantitative ultrasound (QUS) techniques can be used to assess such properties using the implant acting as a waveguide. However, the interaction between an ultrasonic wave and the implant remains poorly understood. The aim of this study is to investigate the sensitivity of the ultrasonic response to the quality and quantity of bone tissue in contact with the implant surface. The 10 MHz ultrasonic response of an implant used in clinical practice was simulated using an axisymmetric three-dimensional finite element model, which was validated experimentally. The amplitude of the echographic response of the implant increases when the depth of a liquid layer located at the implant interface increases. The results show the sensitivity of the QUS technique to the amount of bone in contact with the implant. The quality of bone tissue around the implant is varied by modifying the bone biomechanical properties by 20%. The amplitude of the implant echographic response decreases when bone quality increases, which corresponds to bone healing. In all cases, the amplitude of the implant response decreased when the dental implant stability increased, which is consistent with the experimental results.
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Affiliation(s)
- Romain Vayron
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR, 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR, 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Romain Bosc
- Université Paris-Est, INSERM U955, Equipe 10, 8 rue du Général Sarrail, 94010 Créteil Cedex, France
| | - Salah Naili
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME UMR, 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Guillaume Haïat
- CNRS, Laboratoire Modélisation et Simulation Multi-Échelle, MSME UMR 8208 CNRS, 61 avenue du Général de Gaulle, 94010 Créteil Cedex, France
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40
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Guipieri S, Nagatani Y, Bosc R, Nguyen VH, Chappard C, Geiger D, Haïat G. Ultrasound Speed of Sound Measurements in Trabecular Bone Using the Echographic Response of a Metallic Pin. Ultrasound Med Biol 2015; 41:2966-2976. [PMID: 26320667 DOI: 10.1016/j.ultrasmedbio.2015.07.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Revised: 06/16/2015] [Accepted: 07/06/2015] [Indexed: 06/04/2023]
Abstract
Bone quality is an important parameter in spine surgery, but its clinical assessment remains difficult. The aim of the work described here was to demonstrate in vitro the feasibility of employing quantitative ultrasound to retrieve bone mechanical properties using an echographic technique taking advantage of the presence of a metallic pin inserted in bone tissue. A metallic pin was inserted in bone tissue perpendicular to the transducer axis. The echographic response of the bone sample was determined, and the echo of the pin inserted in bone tissue and water were compared to determine speed of sound, which was compared with bone volume fraction. A 2-D finite-element model was developed to assess the effect of positioning errors. There was a significant correlation between speed of sound and bone volume fraction (R(2) = 0.6). The numerical results indicate the relative robustness of the measurement method, which could be useful to estimate bone quality intra-operatively.
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Affiliation(s)
- Séraphin Guipieri
- CNRS, Laboratoire Modélisation et Simulation MultiEchelle, MSME UMR CNRS 8208, Créteil, France
| | - Yoshiki Nagatani
- CNRS, Laboratoire Modélisation et Simulation MultiEchelle, MSME UMR CNRS 8208, Créteil, France; Kobe City College of Technology, Nishiku, Kobe, Japan
| | - Romain Bosc
- Service de Chirurgie Plastique et Reconstructive, Hôpital Henri Mondor AP-HP, F-94000, Créteil, France
| | - Vu-Hieu Nguyen
- CNRS, Laboratoire Modélisation et Simulation MultiEchelle, MSME UMR CNRS 8208, Créteil, France
| | | | - Didier Geiger
- CNRS, Laboratoire Modélisation et Simulation MultiEchelle, MSME UMR CNRS 8208, Créteil, France
| | - Guillaume Haïat
- CNRS, Laboratoire Modélisation et Simulation MultiEchelle, MSME UMR CNRS 8208, Créteil, France.
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41
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Naili S, Nguyen VH, Vu MB, Desceliers C, Soize C. Modeling of transient wave propagation in a heterogeneous solid layer coupled with fluid: application to long bones. J Acoust Soc Am 2015; 137:668-678. [PMID: 25698002 DOI: 10.1121/1.4906838] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The aim of this work is to evaluate the effects of the heterogeneity and anisotropy of material properties of cortical bone on its ultrasonic response obtained by using axial transmission method. The heterogeneity and anisotropy of material properties are introduced by using a parametric probabilistic model. The geometrical configuration of the tested sample is described by a tri-layer medium composed of a heterogeneous and anisotropic solid layer sandwiched between two acoustic fluid layers of which one of these layers is excited by an acoustic linear source. The numerical results focus on studying of an interest quantity, called velocity of the first arriving signal, showing that it strongly depends on the dispersion induced by statistical fluctuations of stochastic elasticity field.
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Affiliation(s)
- Salah Naili
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME Unité Mixte de Recherche 8208 CNRS, 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Vu-Hieu Nguyen
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME Unité Mixte de Recherche 8208 CNRS, 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Mai-Ba Vu
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME Unité Mixte de Recherche 8208 CNRS, 61 Avenue du Général de Gaulle, 94010 Créteil Cedex, France
| | - Christophe Desceliers
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME Unité Mixte de Recherche 8208 CNRS, 5 Boulevard Descartes, 77454 Marne la Vallée, France
| | - Christian Soize
- Université Paris-Est, Laboratoire Modélisation et Simulation Multi Echelle, MSME Unité Mixte de Recherche 8208 CNRS, 5 Boulevard Descartes, 77454 Marne la Vallée, France
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Nguyen VH, Sibounheuang B, Phommasone K, Vongsouvath M, Newton PN, Piorkowski G, Baronti C, de Lamballerie X, Dubot-Pérès A. First isolation and genomic characterization of enterovirus A71 and coxsackievirus A16 from hand foot and mouth disease patients in the Lao PDR. New Microbes New Infect 2014; 2:170-2. [PMID: 25566395 PMCID: PMC4265048 DOI: 10.1002/nmi2.63] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2014] [Revised: 08/07/2014] [Accepted: 08/11/2014] [Indexed: 11/27/2022] Open
Abstract
Enterovirus A71 (EV-A71) and coxsackievirus A16 (CV-A16) are major aetiological agents of hand,
foot and mouth disease in Asia. We established the first genomic characterization of strains
isolated in 2011 from Lao patients. Isolates were related to EV-A71 genotype C4 and CV-A16 genotype
B1a that circulated in neighbouring countries during the same period. This confirms the regional
character of hand, foot and mouth disease epidemiology and makes plausible the occurrence of severe
disease in the Lao population.
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Affiliation(s)
- V H Nguyen
- Aix Marseille Université, IRD French Institute of Research for Development, EHESP French School of Public Health ; IHU Méditerranée Infection, APHM Public Hospitals of Marseille Marseille, France
| | - B Sibounheuang
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital Vientiane, Lao PDR
| | - K Phommasone
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital Vientiane, Lao PDR
| | - M Vongsouvath
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital Vientiane, Lao PDR
| | - P N Newton
- Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital Vientiane, Lao PDR ; Centre for Tropical Medicine, Nuffield Department of Medicine, Churchill Hospital, University of Oxford Oxford, United Kingdom
| | - G Piorkowski
- Aix Marseille Université, IRD French Institute of Research for Development, EHESP French School of Public Health ; IHU Méditerranée Infection, APHM Public Hospitals of Marseille Marseille, France
| | - C Baronti
- Aix Marseille Université, IRD French Institute of Research for Development, EHESP French School of Public Health
| | - X de Lamballerie
- Aix Marseille Université, IRD French Institute of Research for Development, EHESP French School of Public Health ; IHU Méditerranée Infection, APHM Public Hospitals of Marseille Marseille, France
| | - A Dubot-Pérès
- Aix Marseille Université, IRD French Institute of Research for Development, EHESP French School of Public Health ; Lao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit (LOMWRU), Microbiology Laboratory, Mahosot Hospital Vientiane, Lao PDR ; Centre for Tropical Medicine, Nuffield Department of Medicine, Churchill Hospital, University of Oxford Oxford, United Kingdom
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Tran TNHT, Le LH, Sacchi MD, Nguyen VH, Lou EHM. Multichannel filtering and reconstruction of ultrasonic guided wave fields using time intercept-slowness transform. J Acoust Soc Am 2014; 136:248-259. [PMID: 24993211 DOI: 10.1121/1.4881929] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Multichannel ultrasonic axial-transmission data are multimodal by nature. As guided waves are commonly used in nondestructive material testing, wave field filtering becomes important because the analysis is usually limited to a few lower-order modes and requires their extraction. An application of the Radon transform to enhance signal-to-noise ratio and separate wave fields in ultrasonic records is presented. The method considers guided wave fields as superpositions of plane waves defined by ray parameters (p) and time intercepts (τ) and stacks the amplitudes along linear trajectories, mapping time-offset (t - x) data to a τ - p or Radon panel. The transform is implemented using a least-squares strategy with Cauchy-norm regularization that serves to enhance the focusing power. The method was verified using simulated data and applied to an uneven spatially sampled bovine-bone-plate data set. The results demonstrate the Radon panels show isolated amplitude clusters and the Cauchy-norm constraint provides a more focused Radon image than the damped least-squares regularization. Wave field separation can be achieved by selectively windowing the τ - p signals and inverse transformation, which is illustrated by the successful extraction of the A0 mode in bone plate. In addition, the method effectively attenuates noise, enhances the coherency of the guided wave modes, and reconstructs the missing records. The proposed transform presents a powerful signal-enhancement tool to process guided waves for further analysis and inversion.
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Affiliation(s)
- Tho N H T Tran
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada
| | - Lawrence H Le
- Department of Radiology and Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada
| | - Mauricio D Sacchi
- Department of Physics, University of Alberta, Edmonton, Alberta, Canada
| | - Vu-Hieu Nguyen
- Laboratoire Modélisation et Simulation Multi Echelle UMR 8208 CNRS, Université Paris Est, Paris, France
| | - Edmond H M Lou
- Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
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Nguyen VH, Naili S. Ultrasonic wave propagation in viscoelastic cortical bone plate coupled with fluids: a spectral finite element study. Comput Methods Biomech Biomed Engin 2013; 16:963-74. [DOI: 10.1080/10255842.2011.645811] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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45
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Nguyen VH, Naili S. Simulation of ultrasonic wave propagation in anisotropic poroelastic bone plate using hybrid spectral/finite element method. Int J Numer Method Biomed Eng 2012; 28:861-876. [PMID: 25099567 DOI: 10.1002/cnm.2462] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 12/07/2011] [Accepted: 12/12/2011] [Indexed: 06/03/2023]
Abstract
This paper deals with the modeling of guided waves propagation in in vivo cortical long bone, which is known to be anisotropic medium with functionally graded porosity. The bone is modeled as an anisotropic poroelastic material by using Biot's theory formulated in high frequency domain. A hybrid spectral/finite element formulation has been developed to find the time-domain solution of ultrasonic waves propagating in a poroelastic plate immersed in two fluid halfspaces. The numerical technique is based on a combined Laplace-Fourier transform, which allows to obtain a reduced dimension problem in the frequency-wavenumber domain. In the spectral domain, as radiation conditions representing infinite fluid halfspaces may be exactly introduced, only the heterogeneous solid layer needs to be analyzed by using finite element method. Several numerical tests are presented showing very good performance of the proposed procedure. A preliminary study on the first arrived signal velocities computed by using equivalent elastic and poroelastic models will be presented.
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Affiliation(s)
- Vu-Hieu Nguyen
- Laboratoire Modélisation et Simulation Multi Echelle, Université Paris-Est, MSME UMR 8208 CNRS, 61 Avenue du Général de Gaulle, 94010 Créteil, France
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Abstract
A total of 56 people were affected with gastroenteritis after attending a one-day meeting in a high-quality hotel in the centre of Oslo, Norway, at the end of January 2011. A complete outbreak investigation was carried out. The microbiological investigation confirmed that the outbreak was caused by norovirus. All participants at the meeting were invited by email to complete an online questionnaire asking for information on demographic data, symptoms and food consumption. The results of the epidemiological investigation of the food items served were inconclusive and the source and transmission route of this outbreak remains unclear. However, the environmental investigation highlighted several irregularities in the kitchen that may have enabled the spread of the virus. Specific cleaning procedures and rules were set up for the kitchen staff. As a consequence of this outbreak investigation, the hotel is planning to change its internal routine protocols, for example, samples of food items served at every meal during an event will be stored.
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Affiliation(s)
- B Guzman-Herrador
- European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
- Norwegian Institute of Public Health, Oslo, Norway
| | - B T Heier
- Norwegian Institute of Public Health, Oslo, Norway
| | - E J Osborg
- Norwegian Food Safety Authority, Oslo, Norway
| | - V H Nguyen
- Norwegian Food Safety Authority, Oslo, Norway
| | - L Vold
- Norwegian Institute of Public Health, Oslo, Norway
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Salmon S, Nguyen VH, McLaws ML, Pittet D, Kilpatrick C, Le TAT, Truong AT. Hand hygiene campaigns in a low resource context: a Vietnam perspective. BMC Proc 2011. [PMCID: PMC3239433 DOI: 10.1186/1753-6561-5-s6-o22] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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48
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Nguyen TB, Nguyen VH, Fong W. SU-GG-T-159: Beam Angle Optimization for IMRT Plans. Med Phys 2010. [DOI: 10.1118/1.3468549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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49
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Nguyen VH, Lemaire T, Naili S. Poroelastic behaviour of cortical bone under harmonic axial loading: A finite element study at the osteonal scale. Med Eng Phys 2010; 32:384-90. [DOI: 10.1016/j.medengphy.2010.02.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Revised: 01/30/2010] [Accepted: 02/02/2010] [Indexed: 11/30/2022]
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50
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Getsios D, Caro J, Caro I, El-Hadi W, O’Brien JA, Chevat C, Coudeville L, Nguyen VH. 393: Health Economic Burden of Invasive Meningococcal Disease in the Us. J MöLler,. Am J Epidemiol 2005. [DOI: 10.1093/aje/161.supplement_1.s99] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- D Getsios
- Caro Research Institute, Eslov, SWEDEN
| | - J Caro
- Caro Research Institute, Eslov, SWEDEN
| | - I Caro
- Caro Research Institute, Eslov, SWEDEN
| | - W El-Hadi
- Caro Research Institute, Eslov, SWEDEN
| | | | - C Chevat
- Caro Research Institute, Eslov, SWEDEN
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