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Surgical Treatment of Osteonecrosis of the Femoral Head Using Minimally Invasive Surgical Drilling and Cancellous Grafting at Brazzaville University Hospital

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Open Journal of Orthopedics 2024年第2期14卷 122-132页

作者： Kevin Parfait Bienvenu Bouhelo-Pam Marius Monka Arnauld Sledje Wilfrid Bilongo Bouyou Regis Perry Massouama Paul yèlai Ikounga Roger Bertrand Sah Mbou Armand Moyikoua Department of Orthopaedic surgery and Traumatology University Hospital of Brazzaville Brazzaville Republic of the Congo Faculty of Health Sciences Marien N’GOUABI University Brazzaville Republic of the Congo

Introduction: Osteonecrosis of the femoral head (ONTF) is a debilitating condition. Several treatments have been proposed with controversial results. The aim of our study was to evaluate treatment by surgical drilling coupled with in situ cancellous grafting. Materials and methods: Our study was a case-control study conducted at Brazzaville University Hospital from 1st January 2018 to 31 December 2023. It compared two groups of patients with ONTF: non-operated (13 patients, 20 hips) and operated (22 patients, 35 hips). We used the visual digital scale (VDS) for pain assessment, the Merle D’Aubigne-Postel (MDP) scoring system for clinical and functional assessment, and the evolution of necrosis. Results: The group of non-operated patients had a mean age of 35.69 ± 3.4 years, no improvement in pain with an EVN above seven at the last recoil and a mean global MDP score falling from 12.7 before offloading to 10.13 at one year. The group of patients operated on had a mean age of 37.86 ± 7.02 years, a significant reduction in pain (p = 0.00004) and a significantly increased MDP score (p = 0.0034). A comparison of the two groups of patients showed significant stabilization of the necrotic lesions in the operated patients (p = 0.00067), with better satisfaction in the same group. Conclusion: Surgical drilling combined with grafting in the treatment of early-stage ONTF has improved progress in our series. The technique is reproducible and less invasive. It has made it possible to delay unfavorable progression and, consequently, hip replacement surgery.

关键词： Hip Osteonecrosis of the Femoral Head Conservative Treatment Surgical Drilling Bone Grafting

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Arthroscopic Treatment of Gonarthrosis in a Low-Income Setting

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Open Journal of Orthopedics 2024年第1期14卷 75-82页

作者： Kevin Parfait Bienvenu Bouhelo-Pam Affleck Romaric Ledier Angalla Norbert Edgard Lamini N’soundhat Marius Monka Arnauld Sledje Wilfrid Bilongo Bouyou Paul yèlai Ikounga Térence Olivier Etsaka-Ohoya Department of Orthopaedic Surgery and Traumatology University Hospital of Brazzaville Brazzaville Congo Faculty of Health Sciences Marien N’GOUABI University Brazzaville Congo Department of Rhumatology University Hospital of Brazzaville Brazzaville Congo

Background: Knee osteoarthritis is a frequent, debilitating, and degenerative condition. It is the most common operative indication for surgical arthroscopy. Hypothesis: Arthroscopy allows painless treatment of knee osteoarthritis and functional recovery. Patients and Methods: Our study was conducted in a private medical center in the city of Brazzaville in Congo, during the period from September 2020 to February 2023. It was prospective and based on patients with mechanical knee pain caused by osteoarthritis. A mobile arthroscopy device was used. The IKDC and KOOS scores allowed the evaluation of the treatment. Results: Our work involved 15 men and 7 women, with an average age of 39.9 years. Knee osteoarthritis was classified as type 2 according to Ahlbäck in 26 cases (70.27%) and type 3 in 11 cases (29.73%). In 7 patients, arthroscopy revealed lesions not visualized on MRI. Joint lavage was performed in all cases, synovial debridement in 17 cases (45.94%), and extraction of cartilaginous foreign bodies in 10 cases (27.03%). 20 patients were very satisfied with the surgery and 2 moderately satisfied. The EVA, subjective IKDC and KOOS scores were acceptable on a long-term follow-up. Discussion: Arthroscopy is a modern surgical technique for the management of intra-articular lesions of the knee. It relieves pain and stabilizes the degenerative process. A mobile arthroscopy device used here was preferred because of the low cost of installation and production.

关键词： Arthroscopy Surgery Imaging Knee

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EFFECT OF STRUCTURAL PARAMETERS ON THE THERMAL STRESS OF A NiFe_(2)O_(4)-BASED CERMET INERT ANODE IN ALUMINUM ELECTROLySIS

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Acta Metallurgica Sinica(English Letters) 2007年第2期20卷 139-147页

作者： J. Li Z.G. Wang y.Q. lai y.y. Wu S.L. ye School of Metallurgy Science and Engineering Central South University Changsha 410083 China

Inert anode has been a hot issue in the aluminum industry for many decades. With the help of FEA （finite element analysis） software ANSyS, a model was developed to simulate the thermal stress distribution working condition of an inert anode. To reduce its thermal stress, the effect of some parameters on the thermal stress distribution was investigated, including the anode height, the anode radius, the hole depth, the hole radius, and the radius of inner chamfer and outer chamfer. The results showed that in the actual working condition of an inert anode, there existed a large axial tensile stress near the tangent interface between the anode and bath, which was the major cause of anode breaking. Increasing the anode height and reducing the hole depth properly seemed to be beneficial for the stress distribution. With the increase of anode radius, the stress distribution became better first and then deteriorated, the reasonable value was between 0.045 to 0.06m. The hole radius had a significant effect on the stress and a smaller radius would reduce the thermal stress. The effect of the radius of the inner chamfer and the outer chamfer was less than other parameters.

关键词： inert anode thermal stress structural parameter aluminum electrolysis

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TIMP-1 Production in Human Retinal Pigment Epithelial Cells after Laser Exposure

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Eye Science 2005年第1期21卷 31-37页

作者： Alvin K.H.Kwok Timothy y.y.lai Hin-Fai yam Chi-Pui Pang Department of Ophthalmology & Visual Sciences Department of Ophthalmology & Visual SciencesDepartment of Ophthalmology & Visual SciencesDepartment of Ophthalmology & Visual Sciences The Chinese University of Hong KongHong Kong SAR Department of OphthalmologyHong Kong Sanatorium and HospitalHong Kong SARThe Chinese University of Hong KongHong Kong SARThe Chinese University of Hong KongHong Kong SARThe Chinese University of Hong KongHong Kong SAR

Purpose: To investigate changes in the production of tissue inhibitor of metalloproteinase type 1 (TIMP-1) by human retinal pigment epithelial (RPE) cells following argon laser ***: Human cultured ARPE19 cells were exposed to argon green laser at four different energy levels ranging from 60mW to 360mW. After laser exposure, the culture media were sampled at 0, 24, 72 and 144 hours for TIMP-1 concentration produced by the RPE cells. The levels of TIMP-1 in the cells treated with different laser energy levels were compared with a control group not exposed to laser *** for proliferating cell nuclear antigen (PCNA) was performed to detect any adverse effects on the RPE cells caused by laser ***: Immediately after laser exposure, the concentration of TIMP- 1 was not detectable. At 24 hours after laser exposure, the concentration of TIMP-1 increased significantly in RPE cells treated with 120mW and 240mW at 24 hours (P=0.006 and P=0.001respectively) compared with control cells. At 72 hours after treatment, RPE cells treated at 120mW, 240mW and 360mW demonstrated significantly increase in TIMP-1production compared with control (P=0.003, P ＜ 0.001 and P ＜ 0.001, respectively).No significant reduction in cell viability was observed following laser application as detected by PCNA ***: Our results demonstrated that early TIMP-1 production by RPE cells in cell cultures was enhanced following laser exposure.

关键词： TIMP-1 视网膜上皮细胞激光损伤免疫细胞学视色素

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Evaluation of the association of C5 with neovascular age-related macular degeneration and polypoidal choroidal vasculopathy

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Eye and Vision 2019年第1期6卷 291-297页

作者： Ke Liu Li Ma Timothy y.y.lai Marten E.Brelen Pancy O.S.Tam Clement C.Tham Chi Pui Pang Li Jia Chen Department of Ophthalmology and Visual Sciences The Chinese University of Hong KongHong KongChina Department of Ophthalmology and Visual Sciences Prince of Wales HospitalHong KongChina

Background:Neovascular age-related macular degeneration(AMD)and polypoidal choroidal vasculopathy(PCV)are sight-threatening maculopathies with both environmental and genetic risk *** have previously shown relative risks posed by genes of the complement pathways to neovascular AMD and ***:In this study,we investigated the haplotype-tagging single nucleotide polymorphisms(SNPs)in the complement component 5(C5)gene in 708 unrelated Chinese individuals:200 neovascular AMD patients,233 PCV patients and 275 *** tagging SNPs in C5 were *** single SNP association analysis,haplotype-based association analysis and gene-gene interaction analysis between C5 and other AMD-associated genes were ***:The results revealed none of the six tagging SNPs of the C5 gene had a significant association with neovascular AMD or PCV(P>0.05).We also found insignificant haplotype-based association,and no significant SNPSNP interaction between C5 and other genes(including C2-CFB-RDBP-SKIV2L,SERPING1,CETP,ABCG1,PGF,ANGPT2,CFH and HTRA1)for neovascular AMD and ***:This study showed no statistical significance in the genetic association of C5 with neovascular AMD or PCV in a Hong Kong Chinese *** studies in large samples from different populations are warranted to elucidate the role of C5 in the genetic susceptibility of AMD and PCV.

关键词： Age-related macular degeneration Polypoidal choroidal vasculopathy Complete component 5 C5 Genetic association Single-nucleotide polymorphism

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INFLUENCE OF THE NONMAGNETIC METAL SPACER ON THE MAGNETIC PROPERTIES AND MICROSTRUCTURE OF THE MULTILAyER FILMS

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Acta Metallurgica Sinica(English Letters) 2006年第4期19卷 235-243页

作者： M.H. Li G.H. yu F.W. Zhu H.W. Jiang W.y. lai College of Mechanical Engineering South China University of Technology Guangzhou 510640 China Department of Materials Physics University of Science and Technology Beijing Beijing 100083 China Department of Physics Capital Normal University Beijing 100037 China Institute of Physics Chinese Academy of Sciences Beijing 100080 China

Ta / NiFe/Bi （ Ag, Cu ）/FeMn/Ta and Ta / NiFe1/FeMn / Bi （ Ag, Cu ）/NiFen/Ta films were prepared by magnetic sputtering. The texture and the dependences of the exchange-coupling field on the thickness of Bi, Ag, and Cu in Ta/NiFe/Bi（Ag, Cu） /FeMn/Ta and Ta/NiFe/FeMn/Bi（Ag, Cu）/NiFe/Ta films were studied. XPS results indicate that the Bi atoms migrated into the FeMn layer during the deposition process and a FeMnBi alloy was probably formed or the Bi atoms existed as an impurity in the FeMn layer in Ta/NiFe/Bi（Ag, Cu ）/FeMn/Ta. Otherwise, in Ta/NiFe/FeMn/Bi （Ag, Cu）/NiFe/Ta films, Bi, Ag, and Cu atoms do not remain entirely at the interface of the FeMn/ NiFeⅡfilm, but at least partly segregate to the surface of the NiFe film.

关键词： NiFe/FeMn nonmagnetic spacer exchange coupling XPS (X-ray photoelectron spectroscopy)

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A NOVEL PHASE CONTROL TECHNIQUE FOR INJECTION LOCKED OSCILLATORS

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Journal of Electronics(China) 1995年第4期12卷 374-377页

作者： Kwok-Wai Wong Albert K. y. lai 曾学刚 Department of Electronic Engineering the Chinese University of Hong Kong Shatin Hong Kong University of Electronic Science and Technology of China Chengdu 610054 A novel technique to obtain injection locked oscillators phase tuning beyond 180°is demonstrated. The idea is to cascade injection locked oscillators together for phase change accumulation. A two stage injection locked oscillators can theoretically provide a maximum of 360?phase change within the locking range. This is particularly useful for phased array antenna applications.

A novel technique to obtain injection locked oscillators phase tuning beyond 180° is demonstrated. The idea is to cascade injection locked oscillators together for phase change accumulation. A two stage injection locked oscillators can theoretically provide a maximum of 360?phase change within the locking range. This is particularly useful for phased array antenna applications.

关键词： Phase control Locking Oscillators Antenna array

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直立性血压变化不影响强化降压后的认知结局

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中华高血压杂志 2024年第1期32卷 23-23页

作者： Jiang C Zhao M Li M Wang Z Bai y Guo H Li S lai y Wang y Gao M He L Guo X Li S Liu N Jiang C Tang R Long D Sang C Du X Dong J Anderson CS Ma C 袁源(译) 郑武洪(审校) 不详

直立性血压变化对强化降压的患者认知结局的影响尚不清楚。本研究旨在评估直立性血压变化是否改变血压干预对认知的影响。方法:本研究分析了参与收缩压干预试验降低高血压患者记忆和认知(systolic blood pressure intervention trial me... 详细信息

直立性血压变化对强化降压的患者认知结局的影响尚不清楚。本研究旨在评估直立性血压变化是否改变血压干预对认知的影响。方法:本研究分析了参与收缩压干预试验降低高血压患者记忆和认知(systolic blood pressure intervention trial memory and cognition in decreased hypertension)研究中的8547例受试者资料。应用基于Cox模型的限制性立方样条曲线评估直立性血压改变与发生认知结局的关联性。

关键词：直立性血压变化强化降压 Cox模型限制性立方样条 hypertension 血压改变

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Power Flow Analytical Solutions and Multi-dimensional Voltage Stability Boundaries Based on Multivariate Quotient-difference Method

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1168-1178页

作者： Chengxi Liu Qiupin lai School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China Hubei Engineering and Technology Research Center for AC/DC Intelligent Distribution Network Wuhan 430072China IEEE

This paper proposes a novel Multivariate Quotient-Difference(MQD)method to obtain the approximate analytical solution for AC power flow ***,in the online environment,the power flow solutions covering different operating conditions can be directly obtained by plugging values into multiple symbolic variables,such that the power injections and consumptions of selected buses or areas can be independently *** method first derives a power flow solution through a Multivariate Power Series(MPS).Next,the MQD method is applied to transform the obtained MPS to a Multivariate Pad´e Approximants(MPA)to expand the Radius of Convergence(ROC),so that the accuracy of the derived analytical solution can be significantly *** addition,the hypersurface of the voltage stability boundary can be identified by an analytical formula obtained from the coefficients of *** direct method for power flow solutions and voltage stability boundaries is fast for many online applications,since such analytical solutions can be derived offline and evaluated online by only plugging values into the symbolic variables according to the actual operating *** proposed method is validated in detail on New England 39-bus and IEEE 118-bus systems with independent load variations in multi-regions.

关键词： Analytical power flow solution multivariate power series multivariate Padéapproximants multivariate quotient-difference multi-dimensional voltage stability boundary

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Preface to the Special Issue:Additive Manufacturing—Expanding Production Horizon

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 1-2页

作者： lai-Chang Zhang Centre for Advanced Materials and Manufacturing School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA6027Australia

Additive manufacturing(AM),commonly known as 3D printing,has become a transformative technology that has a profound impact on various industrial *** encompasses a set of techniques for building objects layer by layer from digital *** conventional subtractive manufacturing methods that involve removing material from large blocks,AM adds material incrementally,providing unprecedented design flexibility and efficiency.

关键词： removing printing Expanding

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