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Systemic modulation of skeletal mineralization by magnesium implant promoting fracture healing: Radiological exploration enhanced with PCA-based machine learning in a rat femoral model

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Journal of Magnesium and Alloys 2024年第3期12卷 1009-1020页

作者： Yu Sun Heike Helmholz regine Willumeit-Römer Institute of Metallic Biomaterials Helmholtz-Zentrum HereonGermany

The clinical application of magnesium(Mg)and its alloys for bone fractures has been well supported by in vitro and in vivo ***,there were studies indicating negative effects of high dose Mg intake and sustained local release of Mg ions on bone metabolism or repair,which should not be ignored when developing Mg-based ***,it remains necessary to assess the biological effects of Mg implants in animal models relevant to clinical treatment *** primary purpose of this study was to validate the beneficial effects of intramedullary Mg implants on the healing outcome of femoral fractures in a modified rat *** addition,the mineralization parameters at multiple anatomical sites were evaluated,to investigate their association with healing outcome and potential clinical *** to the control group without Mg implantation,postoperative imaging at week 12 demonstrated better healing outcomes in the Mg group,with more stable unions in 3D analysis and high-mineralized bridging in 2D *** bone tissue mineral density(TMD)was higher in the Mg group at the non-operated femur and lumbar vertebra,while no differences between groups were identified regarding the bone tissue volume(TV),TMD and bone mineral content(BMC)in *** the surgical femur,the Mg group presented higher TMD,but lower TV and BMC in the distal metaphyseal region,as well as reduced BMC at the osteotomy *** component analysis(PCA)-based machine learning revealed that by selecting clinically relevant parameters,radiological markers could be constructed for differentiation of healing outcomes,with better performance than 2D *** study provides insights and preclinical evidence for the rational investigation of bioactive materials,the identification of potential adverse effects,and the promotion of diagnostic capabilities for fracture healing.

关键词： Magnesium Implants Bone fracture Mineralization Systemic modulation Principal component analysis.

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Preclinical in vivo research of magnesium-based implants for fracture treatment: A systematic review of animal model selection and study design

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Journal of Magnesium and Alloys 2021年第2期9卷 351-361页

作者： Yu Sun Heike Helmholz regine Willumeit-Römera Division of Metallic Biomaterials Institute of Materials ResearchHelmholtz-Zentrum Geesthacht21502 GeesthachtGermany Department of Orthopedics First Hospital of China Medical UniversityShenyang 110001China

Background:Degradable magnesium implants are promising for clinical fracture treatment,providing less stress-shielding mechanical support and superior bone-strengthening benefits to traditional *** quality of preclinical research is essential for developing Mg implants;however,there are considerable variations in the model selection and study design in published studies,posing challenges for safe and effective clinical translation of lab ***:The purpose of this systematic review is to investigate the current progress on in vivo research of Mg implants for fracture treatment,focusing on model selection,Mg materials,implant design,methodological and analyzing techniques,aiming to provide comprehensive guidance for future preclinical *** and methods:Pub Med and Embase online databases were searched to identify researches investigating Mg implants in animal models of fracture from 1960 to December 2019,using a combination of keywords:magnesium and *** studies were included without language *** extraction was conducted for qualitative ***-analysis was not performed due to extensive heterogeneities among ***:Twenty studies published from 2014 to 2019 were *** information,animal model,methodological quality,implants preparation,and evaluation techniques were *** methodological assessment revealed low to high risk of bias among *** rodent and non-rodent species were selected,and the anatomical sites for inducing fractures included both cranial-facial and limb *** Mg and alloys with or without surface modification were evaluated,covering implant designs of both intra-medullary and extra-medullary *** and histological evaluations were commonly ***:Published in vivo evidence confirmed the role of Mg-based implants in promoting fracture ***,considering heterogeneity in animal selection,implant prep

关键词： Magnesium Implant Fracture Animal model Study design Biomaterial

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Peri-implant gas accumulation in response to magnesium-based musculoskeletal biomaterials:Reframing current evidence for preclinical research and clinical evaluation

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Journal of Magnesium and Alloys 2024年第1期12卷 59-71页

作者： Yu Sun Heike Helmholz regine Willumeit-Römer Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany

Historically,the rapid degradation and massive gas release from magnesium(Mg)implants resulted in severe emphysema and mechanical *** the advent of new alloys and surface treatment methods,optimized Mg implants have re-entered clinics since last decade with reliable ***,the optimization aims at slowing down the degradation process,rather than exemption of the gas *** study involved a systematic evaluation of current preclinical and clinical evidence,regarding the physical signs,symptoms,radiological features,pathological findings and complications potentially associated with peri±implant gas accumulation(PIGA)after musculoskeletal Mg *** literature search identified 196 potentially relevant publications,and 51 papers were enrolled for further analysis,including 22 preclinical tests and 29 clinical studies published from 2005 to *** Mg-based materials have been evaluated in animal research,and the application of pure Mg and Mg alloys have been reported in clinical follow-ups involving multiple anatomical sites and musculoskeletal *** tissue and intraosseous PIGA are common in both animal tests and clinical follow-ups,and potentially associated with certain adverse *** examinations especially micro-CT and clinical CT scans provide valuable information for quantitative and longitudinal *** according to simulation tests involving Mg implantation and chemical processing,tissue fixation could lead to an increase in the volume of gas cavity,thus the results obtained from ex vivo imaging or histopathological evaluations should be interpreted with *** still lacks standardized procedures or consensus for both preclinical and clinical evaluation of ***,by providing focused insights into the topic,this evidence-based study will facilitate future animal tests and clinical evaluations,and support developing biocompatible Mg implants for the treatment of musculoskeletal

关键词： Magnesium implant Degradation Hydrogen Gas release Postoperative follow-up

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In silico studies of magnesium-based implants: A review of the current stage and challenges

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Journal of Magnesium and Alloys 2022年第11期10卷 2968-2996页

作者： Tamadur Albaraghtheh regine Willumeit-Römer Berit Zeller-Plumhoff Helmholtz-Zentrum hereon GmbH Institute of Metallic BiomaterialsMax-Planck-Str.1Geesthacht 21502Germany

In silico methods to study biodegradable implants have recently received increasing attention due to their potential in reducing experimental time and cost. An important application case for in silico methods are magnesium(Mg)-based biodegradable implants, as they represent a powerful alternative to traditional materials used for temporary orthopaedic applications. Controlling Mg alloy degradation is critical to designing an implant that supports the bone healing process. To simulate different aspects of this biodegradation process, several mathematical models have been proposed with the ultimate aim of replacing laboratory experiments with computational modeling. In this review, we provide a comprehensive and critical discussion of the published models and their performance with respect to capturing the complexity of the biodegradation process. This complexity is presented initially. Additionally, the present review discusses the different approaches of optimizing and quantifying the different sources of errors and uncertainties within the proposed models.

关键词： Biodegradable implants Degradation In silico Phenomenological approach Physical approach Validation Verification Uncertainty quantification Mg

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Alloying effect of silver in magnesium on the development of microstructure and mechanical properties by indirect extrusion

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Journal of Magnesium and Alloys 2021年第1期9卷 112-122页

作者： Bjorn Wiese regine Willumeit-Römer Dietmar Letzig Jan Bohlen Division Metallic Biomaterials Institute of Materials ResearchHelmholtz-Zentrum GeesthachtMax-Planck-Str.1Geesthacht 21502Germany Magnesium Innovation Center(MagIC) Institute of Materials ResearchHelmholtz-Zentrum GeesthachtMax-Planck-Str.1Geesthacht 21502Germany

The effect of Ag in solid solution on the microstructure,texture and the deformation behaviour of indirectly extruded Mg was *** as a solid solution strengthener affects the behaviour during extrusion,resulting in enhanced deformation related heating and corresponding coarser grained *** substantial effect on the texture development is *** mechanical properties simultaneously increase in stress and strain levels with increasing Ag content,especially in tension as a result of the changing impact of the slip modes which can be associated with a decrease of the lattice parameters as well as the c/a ratio of the hcp lattice *** compression tests with twin dominated flow,the impact is much smaller on the compressive yield stress but higher with respect to the twinning related strain hardening *** solution strength functions for Fleischer and Labusch were determined,also confirming the anisotropic behaviour of the extruded Mg alloys.

关键词： Mg-Ag-alloys Lattice parameters Indirect extrusion Microstructure Mechanical properties

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Computational modelling of magnesium degradation in simulated body fluid under physiological conditions

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Journal of Magnesium and Alloys 2022年第4期10卷 965-978页

作者： Berit Zeller-Plumhoff Tamadur AlBaraghtheh Daniel Höche regine Willumeit-Römer Helmholtz-Zentrum hereon GmbH Institute of Metallic BiomaterialsMax-Planck-Straße 1Geesthacht21502Germany Helmholtz-Zentrum hereon GmbH Institute of Surface ScienceMax-Planck-Straße 1Geesthacht21502Germany

Magnesium alloys are highly attractive for the use as temporary implant materials, due to their high biocompatibility and ***, the prediction of the degradation rate of the implants is difficult, therefore, a large number of experiments are required. Computational modelling can aid in enabling the predictability, if sufficiently accurate models can be established. This work presents a generalized model of the degradation of pure magnesium in simulated body fluid over the course of 28 days considering uncertainty aspects. The model includes the computation of the metallic material thinning and is calibrated using the mean degradation depth of several experimental datasets simultaneously. Additionally, the formation and precipitation of relevant degradation products on the sample surface is modelled, based on the ionic composition of simulated body fluid. The computed mean degradation depth is in good agreement with the experimental data(NRMSE=0.07). However, the quality of the depth profile curves of the determined elemental weight percentage of the degradation products differs between elements(such as NRMSE=0.40 for phosphorus vs. NRMSE=1.03 for magnesium). This indicates that the implementation of precipitate formation may need further developments. The sensitivity analysis showed that the model parameters are correlated and which is related to the complexity and the high computational costs of the model. Overall, the model provides a correlating fit to the experimental data of pure Mg samples of different geometries degrading in simulated body fluid with reliable error estimation.

关键词： Biodegradation Magnesium Computational modelling Corrosion Uncertainty quantification Kriging

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Neurological Sequelae in Cranioencephalic Trauma Patients at the National Hospital in Zinder (Niger)

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Open Journal of Modern Neurosurgery 2022年第2期12卷 104-115页

作者： Mahaman Sani Rabiou Abd-el Kader Moumouni Abiba Tamou Tabe Essosinam Kpelao Stackys Hounkpatin Moussa Taofik Abdoulaye Adamou Babana dede regine diane ajavo. Aminata Kelani Soumaila Sanoussi Depetement of Neurosurgery Zinder Hospital Zinder Niger Department of Neurosurgery Kara University Hospital Center KaraTogo Depeartment of Radiology Kara Regional Hospital Center Kara Togo Department of Neurosurgery Syvanus Olympio University Hospital Center Lome Togo Depetement of Traumatology Zinder Hospital Zinder Niger Department of Neurosurgery Maradi Niger Reference Hospital Maradi Niger Faculty of Health Sciences University of Kara Kara Togo Depetement of Neurosurgery CHU Niamey Niamey Niger

Introduction: Cranioencephalic trauma is a frequent reason for admission to emergency departments and is a source of mild to severe neuropsychological defects that will persist over time. Their management remains difficult. Objectives: To evaluate the sequelae presented by patients suffering from cranioencephalic trauma. Methods: This was a retrospective, descriptive, cross-sectional study conducted at the National Hospital of Zinder. It will include all patients admitted and hospitalised in the emergency, intensive care and neurosurgery departments of Zinder National Hospital for head injury over a period of 28 months from 1 January 2016 to 30 April 2018. Brain scan, X-ray were the imaging tests used. Results: Out of a total of 974 admissions, 367 were retained, i.e. 37.6%, with a male predominance (82.6%). The average age was 26.5 years. MVAs were represented in 89.7% of cases. Moderate CTE accounted for 64% of cases. Altered consciousness was reported in 295 patients (80.38% of cases). Brain scans were used in 76.7% of cases and skull X-rays in 4.2% of cases. Medical management was performed in all patients. Treatment was operative in 78 patients (21.25%). Recovery without immediate sequelae was found in 187 patients (50.9%). Persistent headache represented 47.7% of the late sequelae observed in the patients, epileptic seizures represented 16.8% of the late sequelae, neurological deficit represented 14.7%. Conclusion: Cranioencephalic trauma represents a major public health issue. Although their in-hospital management remains a challenge, post-hospital management related to the appearance of sequelae remains another.

关键词： Cranioencephalic Trauma CT Scan X-Ray Sequelae Niger

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Active surveillance in low-and intermediate-risk prostate cancer

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Asian Journal of Andrology 2024年第6期26卷 582-583页

作者： Linda Cerbone Giovanni regine Fabio Calabrò Department of Medical Oncology San Camillo Forlanini HospitalRome 00152Italy Radiology Department San Camillo Forlanini HospitalRome 00152Italy Oncology Department IRCCS National Cancer Center Regina ElenaRome 00144Italy

Based on the GLOBOCAN statistics 2023, prostate cancer is the first and most commonly diagnosed cancer and the second cause of cancer death in men, with estimated 288 300 new cancer cases and 34 700 deaths.1 Interestingly, the incidence rate of prostate cancer decreased around 40% from 2007 to 2014. This reflects the recommendation of the United States Preventive Services Task Force (USPSTF) to avoid prostate-specific antigen (PSA) testing screening for ≥75 years old men in 2008 and for all men in 2012.1 In the 1990s, PSA testing for screening purpose was widely adopted. In a few years, considering how common prostate cancer is, many issues related to overdiagnosis and overtreatment of early detected localized prostate cancer raised in scientific community.2 Several studies showed that patients with early moderately and highly differentiated prostate cancer who did not undergo local treatment have a low death rate. Considering that curative treatment options such as surgery or radiotherapy are at risk of significant side effects, definition of deferred treatment approach for those patients started to become a medical need. Two different conservative approaches with different goals and inclusion criteria are considered with the aim to reduce overtreatment: active surveillance (AS) and watchful waiting (WW), as shown in Table 1. In this opinion, we will focus on AS.3,4.

关键词： testing Active raised

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A short review on diffusion coefficients in magnesium alloys and related applications

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Journal of Magnesium and Alloys 2022年第12期10卷 3289-3305页

作者： Hui Shi Yuanding Huang Qun Luo Sarkis Gavras regine Willumeit-Römer Norbert Hort Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Str.1Geesthacht 21502Germany State Key Laboratory of Advanced Special Steels and Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Institute of Product and Process Innovation Leuphana University LüneburgUniversitätsallee 1Lüneburg D-21335Germany

To have a better understand on the change of microstructure via kinetics, the diffusion behavior of Mg alloys is of special interest to researchers. Meanwhile, diffusion coefficients of Mg based alloys can explain and represent their diffusion behavior well. The evolution of experimental and calculated methods for detecting and extracting diffusion coefficients was discussed briefly. The reasonable diffusion data, especially self-diffusion coefficients, impurity diffusion coefficients and inter-diffusion coefficients of Mg alloys, were reviewed in detail serving to design the Mg alloys with higher accuracy. Then the practical applications of diffusion coefficients of Mg alloys were summarized,including diffusional mobility establishing, precipitation simulation and mechanical properties prediction.

关键词： Magnesium alloys Diffusion coefficients Atomic mobility Precipitation Mechanical properties

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Effects of proteins on magnesium degradation-static *** conditions

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Journal of Magnesium and Alloys 2023年第4期11卷 1332-1342页

作者： Ruiqing Hou Frank Feyerabend Heike Helmholz Vasil M.Garamus regine Willumeit-Römer School of Materials Science and Engineering&Henan Key Laboratory of Advanced Magnesium Alloys Zhengzhou UniversityNo.100 Science AvenueZhengzhou 450001China Institute of Metallic Biomaterials Helmholtz-Zentrum Hereon(Hereon)Max-Planck-Str.1Geesthacht 21502Germany

The interaction between organic molecules and biomaterial surfaces determines the fate of biomaterials during their service life,which is also the research hotspots in the field of *** understand the mechanism of protein interaction with magnesium(Mg)degradation,alloying elements,immersion time,protein concentration and surface conditions have been previously considered for the effect of proteins on Mg ***,fluid flow,as one of the critical factors,drew little attention in this *** the present study,the effect of bovine serum albumin(BSA)and fetal bovine serum(FBS)on Mg degradation was compared under static and dynamic *** results revealed that both BSA and FBS slightly decreased the degradation rate of Mg in Hanks’balanced salt solution(HBSS)under static immersion due to the protein adsorption and the formation of a Ca/P-rich top layer on Mg surface,whereas under dynamic flow condition the degradation of Mg was significantly accelerated in the presence of BSA or *** reasons seemed to stem from the weakened protein adsorption on Mg surface in this case and the dynamically enhanced interaction between proteins and ions/products in solutions,which largely weaken the combination of the top Ca/P-rich layer with the inner corrosion product *** results highlight the importance of testing conditions for Mg characterization in vitro and the synergistic effect between different parameters on Mg degradation.

关键词： Flow Bovine serum albumin Fetal bovine serum Protein adsorption

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