The Experts below are selected from a list of 1305 Experts worldwide ranked by ideXlab platform
Karakasli Ahme - One of the best experts on this subject based on the ideXlab platform.
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Iatrogenic lateral meniscus anterior horn injury in different tibial tunnel placement techniques in ACL reconstruction surgery – A cadaveric study
2017Co-Authors: Karakasli Ahme, Aca Niha, Asci Onu, Erdura Mehme, Kaya ErolAbstract:The aim of this study was to analyze the effect of tibial tunnel positioning in single bundle and double bundle ACL reconstructions on lateral meniscus anterior root. Twelve single knee cadavers were used, 6 for a single bundle ACL reconstruction, which were reamed gradually starting from 8 mm, 9 mm and ended with a 10 mm Reamers, while the other 6 were prepared for a double bundle ACL reconstruction in which 7 mm Reamer for the AM tunnel and 6 mm Reamer for the PL tunnel were used. After drilling, changes of lengths and thicknesses of anterior horns of the lateral menisci were recorded. Before drilling, the groups were homogenous for the lateral menisci dimensions. After drilling, no statistically significant difference was noticed between the two groups. However, in single bundle group, 2 anterior horns width injury (1.44 mm and 2.13 mm) with the 9 mm Reamer and 3 anterior horns width injury (2.51 mm, 3.55 mm and 4.28 mm) with the 10 mm Reamer were recorded. However in double bundle group a single anterior horn width injury (2.82 mm) was recorded. Using a greater size Reamer in single bundle reconstruction, causes a relatively higher risk of lateral meniscal anterior root injury. Lateral meniscus stability should be examined arthroscopically after reaming with large Reamers
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Iatrogenic lateral meniscus anterior horn injury in different tibial tunnel placement techniques in ACL reconstruction surgery – A cadaveric study
Turkish Association of Orthopaedics and Traumatology. Publishing services by Elsevier B.V., 2016Co-Authors: Karakasli Ahme, Aca Niha, Asci Onu, Erdura Mehme, Kaya ErolAbstract:AbstractObjectivesThe aim of this study was to analyze the effect of tibial tunnel positioning in single bundle and double bundle ACL reconstructions on lateral meniscus anterior root.MaterialsTwelve single knee cadavers were used, 6 for a single bundle ACL reconstruction, which were reamed gradually starting from 8 mm, 9 mm and ended with a 10 mm Reamers, while the other 6 were prepared for a double bundle ACL reconstruction in which 7 mm Reamer for the AM tunnel and 6 mm Reamer for the PL tunnel were used. After drilling, changes of lengths and thicknesses of anterior horns of the lateral menisci were recorded.ResultsBefore drilling, the groups were homogenous for the lateral menisci dimensions. After drilling, no statistically significant difference was noticed between the two groups. However, in single bundle group, 2 anterior horns width injury (1.44 mm and 2.13 mm) with the 9 mm Reamer and 3 anterior horns width injury (2.51 mm, 3.55 mm and 4.28 mm) with the 10 mm Reamer were recorded. However in double bundle group a single anterior horn width injury (2.82 mm) was recorded.ConclusionUsing a greater size Reamer in single bundle reconstruction, causes a relatively higher risk of lateral meniscal anterior root injury. Lateral meniscus stability should be examined arthroscopically after reaming with large Reamers
Kaya Erol - One of the best experts on this subject based on the ideXlab platform.
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Iatrogenic lateral meniscus anterior horn injury in different tibial tunnel placement techniques in ACL reconstruction surgery – A cadaveric study
2017Co-Authors: Karakasli Ahme, Aca Niha, Asci Onu, Erdura Mehme, Kaya ErolAbstract:The aim of this study was to analyze the effect of tibial tunnel positioning in single bundle and double bundle ACL reconstructions on lateral meniscus anterior root. Twelve single knee cadavers were used, 6 for a single bundle ACL reconstruction, which were reamed gradually starting from 8 mm, 9 mm and ended with a 10 mm Reamers, while the other 6 were prepared for a double bundle ACL reconstruction in which 7 mm Reamer for the AM tunnel and 6 mm Reamer for the PL tunnel were used. After drilling, changes of lengths and thicknesses of anterior horns of the lateral menisci were recorded. Before drilling, the groups were homogenous for the lateral menisci dimensions. After drilling, no statistically significant difference was noticed between the two groups. However, in single bundle group, 2 anterior horns width injury (1.44 mm and 2.13 mm) with the 9 mm Reamer and 3 anterior horns width injury (2.51 mm, 3.55 mm and 4.28 mm) with the 10 mm Reamer were recorded. However in double bundle group a single anterior horn width injury (2.82 mm) was recorded. Using a greater size Reamer in single bundle reconstruction, causes a relatively higher risk of lateral meniscal anterior root injury. Lateral meniscus stability should be examined arthroscopically after reaming with large Reamers
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Iatrogenic lateral meniscus anterior horn injury in different tibial tunnel placement techniques in ACL reconstruction surgery – A cadaveric study
Turkish Association of Orthopaedics and Traumatology. Publishing services by Elsevier B.V., 2016Co-Authors: Karakasli Ahme, Aca Niha, Asci Onu, Erdura Mehme, Kaya ErolAbstract:AbstractObjectivesThe aim of this study was to analyze the effect of tibial tunnel positioning in single bundle and double bundle ACL reconstructions on lateral meniscus anterior root.MaterialsTwelve single knee cadavers were used, 6 for a single bundle ACL reconstruction, which were reamed gradually starting from 8 mm, 9 mm and ended with a 10 mm Reamers, while the other 6 were prepared for a double bundle ACL reconstruction in which 7 mm Reamer for the AM tunnel and 6 mm Reamer for the PL tunnel were used. After drilling, changes of lengths and thicknesses of anterior horns of the lateral menisci were recorded.ResultsBefore drilling, the groups were homogenous for the lateral menisci dimensions. After drilling, no statistically significant difference was noticed between the two groups. However, in single bundle group, 2 anterior horns width injury (1.44 mm and 2.13 mm) with the 9 mm Reamer and 3 anterior horns width injury (2.51 mm, 3.55 mm and 4.28 mm) with the 10 mm Reamer were recorded. However in double bundle group a single anterior horn width injury (2.82 mm) was recorded.ConclusionUsing a greater size Reamer in single bundle reconstruction, causes a relatively higher risk of lateral meniscal anterior root injury. Lateral meniscus stability should be examined arthroscopically after reaming with large Reamers
Reame Andrew - One of the best experts on this subject based on the ideXlab platform.
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Information Resources to Facilitate Middle Skills Workforce Development
National Academy of Sciences (U.S.), 2015Co-Authors: Reame AndrewAbstract:This 154-page paper was written by Andrew Reamer and is provided by the National Academy of Sciences. This paper "suggests improvements in information resources that would enable a well-functioning supply chain for middle-skill jobs, i.e., jobs that require some postsecondary education but not a four-year degree." The following sections are included: Introduction, Middle Skills Workforce Development Decisions Requiring Good Information, Information Required for Successful Middle Skills Workforce Development Decisions, The Landscape: Information Providers for Middle Skill Workforce Development Decision, Legal and Policy Framework for Middle Skills WLMI, Assessment of Information Available for Good Middle Skills Workforce Development Decisions, Findings and Recommendations: Governance, Findings and Recommendations: Program Priorities, and Conclusion. Three appendices are also included.Â
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Information Resources for Middle Skills for Workforce Development
National Academy of Sciences (U.S.), 2015Co-Authors: Reame AndrewAbstract:These slides are from a presentation given by Andrew Reamer at the Symposium on the Supply Chain for Middle-Skill Jobs: Education, Training, and Certification Pathways. This presentation discusses information resources and providers for middle skill workforce development. Topics of the presentation include: Information's Role in U.S. Labor Markets, Middle Skills Labor Market Participants, Information Useful for Successful Middle Skills Decisions, Federal Information Role, Federal Information Providers, Private WLMI, Employer-led Collaboratives, Legal and Policy Framework for WLMIS, WLMIS Effectiveness, Occupational Descriptions, Characteristics of Labor Markets, Employment Outcomes, Customized Guidance for Individuals, and more.Â
Reis, Alcione Dos - One of the best experts on this subject based on the ideXlab platform.
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Study on the use of special designed drill in replacement by Reamer in the production of holes in compacted graphite cast iron
UFU, 2014Co-Authors: Reis, Alcione DosAbstract:In many applications of metalworking industry it is required mass production of parts containing holes with finish and tolerances typically from precision assembling, with working quality, ISO IT grade, ranging from IT7- IT5. But to produce these holes with tighter tolerances and with low geometrical errors, conventional twist drills may be not enough, so further processes are required, like reaming for example. Before any reaming process comes the drilling process, resulting in two different tools, two parts on necessary machining time, which in turn affects productivity and competitiveness. Therefore , any investment in the production of tools and techniques to reduce the machining time of close tolerance holes without affecting the integrity of the surface and preferably at a lower cost , will receive special attention from the machining community. In this context, this paper presents a technical and economic study of the use of special designed drill in replacement by a Reamer the production of cylindrical holes of 10 mm diameter pieces of compacted graphite cast iron in terms of finish, roundness and dimensional deviation. It was also investigated the influence of the allowance in the final quality of the machined hole Reamer. The surface of the holes and the microhardness of the machined holes were also analyzed and the tool wear was monitored. Finally, the economic analysis of the tools employed was performed. The results showed that special drill resulted in finish and dimensional deviation as good as those produced by the Reamer. IT6 was the working quality obtained after reaming with reaming allowance of 0.5mm, while IT8 quality was obtained by using the special designed drill. Wear on special drill was lower than that observed in the Reamer, and for the latter chipping occurred. Up to 29% of reduction in machining time was achieved by using the special drill, which resulted in a reduction of 33% cost as well. In contrast the values of cylindricity deviations were higher than those obtained with the Reamers under the conditions investigated. The hardness was not affected by the processes employed.Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorMestre em Engenharia MecânicaEm muitas aplicações da indústria metal-mecânica exige-se a fabricação de peças com furos que apresentem acabamento e exatidão geométrica necessária para a montagem de precisão, normalmente com qualidade de trabalho variando entre ISO IT5-IT7. Mas para a produção destes furos de tolerâncias mais estreitas e com menores erros geométricos, as brocas helicoidais convencionais não são suficientes, de forma que são necessários processos subsequentes, como o alargamento, por exemplo. Antes de qualquer operação de alargamento vem à operação de furação, chamada de pré-furação, e assim para um furo alargado são necessárias no mínimo duas ferramentas diferentes, duas parcelas no tempo de usinagem, que por sua vez afeta a produtividade e competitividade. Portanto, qualquer investimento na produção de ferramentas e técnicas que permitam reduzir o tempo de usinagem de furos de tolerância estreita, sem afetar a integridade da superfície e de preferência com menor custo, receberá especial atenção da comunidade de usinagem. Neste contexto, este trabalho apresenta um estudo técnico e econômico do emprego de broca especial em substituição ao alargador, na produção de furos cilíndricos, de 10 mm de diâmetro, em peças de ferro fundido vermicular, em termos de acabamento, cilindricidade e desvio dimensional. Investigou-se também a influência do sobremetal na qualidade final do furo usinado pelo alargador. As paredes dos furos e a microdureza dos furos usinados foram também analisados e o desgaste das ferramentas foi monitorado. Por último, foi realizada a análise econômica das ferramentas empregadas. Os resultados mostraram que a broca especial resultou em acabamento e desvio dimensionais tão bons quanto aqueles produzidos pelo alargador. IT6 foi á qualidade obtida pelo alargador após furação com sobremetal de 0,5 mm, enquanto que a broca especial produziu qualidade IT8. O desgaste da broca especial foi menor que aquele dos alargadores, sendo que para estes últimos ocorreu lascamento. Cerca de 29% de redução no tempo de usinagem foram obtidos com á broca especial, o que resultou em um custo de produção 33% menor. Em contrapartida os valores dos desvios de cilindricidade foram superiores aqueles obtidos com os alargadores nas condições investigadas. A microdureza não foi afetada pelos processos empregados
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Study on the use of special designed drill in replacement by Reamer in the production of holes in compacted graphite cast iron
Universidade Federal de Uberlândia, 2014Co-Authors: Reis, Alcione DosAbstract:Em muitas aplicações da indústria metal-mecânica exige-se a fabricação de peças com furos que apresentem acabamento e exatidão geométrica necessária para a montagem de precisão, normalmente com qualidade de trabalho variando entre ISO IT5-IT7. Mas para a produção destes furos de tolerâncias mais estreitas e com menores erros geométricos, as brocas helicoidais convencionais não são suficientes, de forma que são necessários processos subsequentes, como o alargamento, por exemplo. Antes de qualquer operação de alargamento vem à operação de furação, chamada de pré-furação, e assim para um furo alargado são necessárias no mínimo duas ferramentas diferentes, duas parcelas no tempo de usinagem, que por sua vez afeta a produtividade e competitividade. Portanto, qualquer investimento na produção de ferramentas e técnicas que permitam reduzir o tempo de usinagem de furos de tolerância estreita, sem afetar a integridade da superfície e de preferência com menor custo, receberá especial atenção da comunidade de usinagem. Neste contexto, este trabalho apresenta um estudo técnico e econômico do emprego de broca especial em substituição ao alargador, na produção de furos cilíndricos, de 10 mm de diâmetro, em peças de ferro fundido vermicular, em termos de acabamento, cilindricidade e desvio dimensional. Investigou-se também a influência do sobremetal na qualidade final do furo usinado pelo alargador. As paredes dos furos e a microdureza dos furos usinados foram também analisados e o desgaste das ferramentas foi monitorado. Por último, foi realizada a análise econômica das ferramentas empregadas. Os resultados mostraram que a broca especial resultou em acabamento e desvio dimensionais tão bons quanto aqueles produzidos pelo alargador. IT6 foi á qualidade obtida pelo alargador após furação com sobremetal de 0,5 mm, enquanto que a broca especial produziu qualidade IT8. O desgaste da broca especial foi menor que aquele dos alargadores, sendo que para estes últimos ocorreu lascamento. Cerca de 29% de redução no tempo de usinagem foram obtidos com á broca especial, o que resultou em um custo de produção 33% menor. Em contrapartida os valores dos desvios de cilindricidade foram superiores aqueles obtidos com os alargadores nas condições investigadas. A microdureza não foi afetada pelos processos empregados.In many applications of metalworking industry it is required mass production of parts containing holes with finish and tolerances typically from precision assembling, with working quality, ISO IT grade, ranging from IT7- IT5. But to produce these holes with tighter tolerances and with low geometrical errors, conventional twist drills may be not enough, so further processes are required, like reaming for example. Before any reaming process comes the drilling process, resulting in two different tools, two parts on necessary machining time, which in turn affects productivity and competitiveness. Therefore , any investment in the production of tools and techniques to reduce the machining time of close tolerance holes without affecting the integrity of the surface and preferably at a lower cost , will receive special attention from the machining community. In this context, this paper presents a technical and economic study of the use of special designed drill in replacement by a Reamer the production of cylindrical holes of 10 mm diameter pieces of compacted graphite cast iron in terms of finish, roundness and dimensional deviation. It was also investigated the influence of the allowance in the final quality of the machined hole Reamer. The surface of the holes and the microhardness of the machined holes were also analyzed and the tool wear was monitored. Finally, the economic analysis of the tools employed was performed. The results showed that special drill resulted in finish and dimensional deviation as good as those produced by the Reamer. IT6 was the working quality obtained after reaming with reaming allowance of 0.5mm, while IT8 quality was obtained by using the special designed drill. Wear on special drill was lower than that observed in the Reamer, and for the latter chipping occurred. Up to 29% of reduction in machining time was achieved by using the special drill, which resulted in a reduction of 33% cost as well. In contrast the values of cylindricity deviations were higher than those obtained with the Reamers under the conditions investigated. The hardness was not affected by the processes employed
Myung Chul Lee - One of the best experts on this subject based on the ideXlab platform.
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Anatomic tunnel placement can be achieved with a modification to transtibial technique in single bundle anterior cruciate ligament reconstruction: A cadaver study
2017Co-Authors: Joon Kyu Lee, Sahnghoo Lee, Ki Tae Kim, Myung Chul LeeAbstract:Placing the tunnels in the anatomic positions is important for successful restoration of knee function after anterior cruciate ligament reconstruction (ACLR). It has been shown that it is difficult to place the tunnels in the anatomic position using the transtibial technique. The purpose of this study was to evaluate the effect of each step of our modified transtibial technique (mTT) on the positioning of the femoral tunnel so as to assess whether the mTT could achieve anatomic placements of the tunnels without tibial tunnel expansion. Ten fresh-frozen cadaveric knees were used. First, the tibial tunnel was created in the center of ACL footprint. Then, a pin was inserted through the tibial tunnel using a femoral guide by four stepwise techniques: transtibial technique, additional anterior drawer force applied to the proximal tibia, another additional varus force applied to the tibia and finally, additional external rotation of the tibia and the femoral guide (mTT). Then, tibial tunnel was re-reamed using mTT with 10mm-diameter Reamer. The pin positions in each technique on the femur were evaluated by the quadrant method and shapes of the tibial tunnel apertures were evaluated. Femoral pin positions in the four techniques were 23.6±4.5%, 28.4±3.4%, 30.1±3.8%, 33.2±4.5% in the superior-inferior position, and 23.9±4.3%, 26.2±3.7%, 32.0±4.3%, 36.9±4.8% in the anterior-posterior position, respectively. Pin position shifted to more inferior and posterior position with each step of mTT (all p values comparing superior-inferior and anterior-posterior positions of each step with positions of previous step were 0.008 or less). Using mTT, tibial tunnel aperture was 10.5±0.3mm wide and 12.9±1.1mm long. In conclusion, anatomic placements of femoral tunnels in ACLR without excessive tibial tunnel expansion could be achieved using the mTT.
