Artykuły w czasopismach: „Hip structure analysis”

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Ha, Yong-Chan, Jun-Il Yoo, Jeongkyun Yoo i Ki Soo Park. "Effects of Hip Structure Analysis Variables on Hip Fracture: A Propensity Score Matching Study". Journal of Clinical Medicine 8, nr 10 (20.09.2019): 1507. http://dx.doi.org/10.3390/jcm8101507.

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The purpose of this retrospective study was to compare the hip structural analysis (HSA) levels of patients with those of a hip fracture group. All patients with an initial hip fracture who were older than or equal to 65 years old and admitted to our hospital between March 2018 and January 2019 were eligible for this study. During the study period, 134 hip fracture patients aged 65 years and older were admitted to the study institution, and a total of 51 hip fracture patients were ultimately assigned to the patient group. Age, sex, body mass index (BMI), skeletal muscle index (SMI), and vitamin D were matched in the two groups (hip fracture (HF) group vs. non-hip fracture group) using propensity score matching (PSM) without any statistical differences. Following propensity score matching, 51 patients in the HF group and 51 patients in the non-HF group were included in the study, respectively. Hip axis length (p = 0.031), neck-shaft angle (p = 0.043), width of intertrochanter (p = 0.005), and femur shaft (p = 0.01) were found to be significantly higher in the HF group (107.31 (mean) ± 9.55 (standard deviation, SD), 131.11 ± 5.29, 5.57 ± 0.58, and 3.05 ± 0.23, respectively) than in the non-HF group (102.07 ± 14.15, 128.85 ± 5.81, 5.29 ± 0.38, and 2.92 ± 0.23, respectively). However, cross-sectional area (CSA) of femur neck (p = 0.005) and femur shaft (p = 0.01) as well as cortical thickness (CT) of femur neck (p = 0.031) and femur shaft (p = 0.031) were found to be significantly lower in the HF group (1.93 ± 0.44, 3.18 ± 0.83, 0.11 ± 0.02, and 0.38 ± 0.09, respectively) than in the non-HF group (2.12 ± 0.46, 3.57 ± 0.78, 0.13 ± 0.03, and 0.47 ± 0.11, respectively). The HSA showed excellent sensitivity (82.4% to 90.2%). HSA is an important factor in predicting the occurrence of hip fracture. Therefore, not only should bone mineral density (BMD) be considered clinically, but it is also important to look closely at HSA for risk of hip fracture.

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Cui, Bingyan, Liwen Chen, Zhijun Wang, Yuanhao Zhao, Zhanxian Li i Zhenlin Jin. "Design and Dynamic Analysis of a Novel Biomimetic Robotics Hip Joint". Applied Bionics and Biomechanics 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/145040.

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In order to increase the workspace and the carrying capacity of biomimetic robotics hip joint, a novel biomimetic robotics hip joint was developed. The biomimetic robotics hip joint is mainly composed of a moving platform, frame, and 3-RRR orthogonal spherical parallel mechanism branched chains, and has the characteristics of compact structure, large bearing capacity, high positioning accuracy, and good controllability. The functions of the biomimetic robotics hip joint are introduced, such as the technical parameters, the structure and the driving mode. The biomimetic robotics hip joint model of the robot is established, the kinematics equation is described, and then the dynamics are analyzed and simulated with ADAMS software. The proposed analysis methodology can be provided a theoretical base for biomimetic robotics hip joint of the servo motor selection and structural design. The designed hip joint can be applied in serial and parallel robots or any other mechanisms.

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Kladovasilakis, Nikolaos, Konstantinos Tsongas i Dimitrios Tzetzis. "Finite Element Analysis of Orthopedic Hip Implant with Functionally Graded Bioinspired Lattice Structures". Biomimetics 5, nr 3 (12.09.2020): 44. http://dx.doi.org/10.3390/biomimetics5030044.

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The topology optimization (TO) process has the objective to structurally optimize products in various industries, such as in biomechanical engineering. Additive manufacturing facilitates this procedure and enables the utility of advanced structures in order to achieve the optimal product design. Currently, orthopedic implants are fabricated from metal or metal alloys with totally solid structure to withstand the applied loads; nevertheless, such a practice reduces the compatibility with human tissues and increases the manufacturing cost as more feedstock material is needed. This article investigates the possibility of applying bioinspired lattice structures (cellular materials) in order to topologically optimize an orthopedic hip implant, made of Inconel 718 superalloy. Lattice structures enable topology optimization of an object by reducing its weight and increasing its porosity without compromising its mechanical behavior. Specifically, three different bioinspired advanced lattice structures were investigated through finite element analysis (FEA) under in vivo loading. Furthermore, the regions with lattice structure were optimized through functional gradation of the cellular material. Results have shown that optimal design of hip implant geometry, in terms of stress behavior, was achieved through functionally graded lattice structures and the hip implant is capable of withstanding up to two times the in vivo loads, suggesting that this design is a suitable and effective replacement for a solid implant.

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Choi, Hana, i Jun-II Yoo. "Sarcopenia and Hip-Structure Analysis Variables in Korean Elderly Population". Journal of Clinical Densitometry 23, nr 3 (lipiec 2020): 482–89. http://dx.doi.org/10.1016/j.jocd.2018.08.004.

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Beck, Thomas J. "Extending DXA beyond bone mineral density: Understanding hip structure analysis". Current Osteoporosis Reports 5, nr 2 (czerwiec 2007): 49–55. http://dx.doi.org/10.1007/s11914-007-0002-4.

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Khoo, B. C. C., J. R. Lewis, K. Brown i R. L. Prince. "Evaluation of a simplified hip structure analysis method for the prediction of incident hip fracture events". Osteoporosis International 27, nr 1 (18.08.2015): 241–48. http://dx.doi.org/10.1007/s00198-015-3282-z.

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Takada, Junichi, Genichiro Katahira, Kousuke Iba, Takashi Yoshizaki i Toshihiko Yamashita. "Hip structure analysis of bisphosphonate-treated Japanese postmenopausal women with osteoporosis". Journal of Bone and Mineral Metabolism 29, nr 4 (30.11.2010): 458–65. http://dx.doi.org/10.1007/s00774-010-0242-8.

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Gayko, G. V., O. A. Haluzynskyi, O. M. Sulyma i V. M. Pidhaietskyi. "The Role of Spondyloarthrosis in the Structure of Pain After Hip Arthroplasty". Visnyk Ortopedii Travmatologii Protezuvannia 106, nr 3 (2020): 71–78. http://dx.doi.org/10.37647/0132-2486-2020-106-3-71-78.

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Summary. In the structure of complications, pain syndrome, which is not associated with infection or instability of the components of the endoprosthesis, remains a serious problem due to the difficulties of diagnosis and treatment. The cause of the residual pain may be the presence of spondyloarthrosis of the lumbar spine in the patient. Objective: to determine the role of spondyloarthrosis of the lumbar spine in the structure of pain after hip arthroplasty. Materials and Methods. A sample and retrospective analysis of the case histories of 138 patients with hip-lumbar syndrome who underwent hip arthroplasty in the Department of Traumatology and Orthopedics of Adults of the SI “Institute of Traumatology and Orthopedics of NAMS of Ukraine” was carried out. All patients were examined clinically and radiographically. Additionally, all patients were examined by a neurologist with the determination of the neurological status and diagnosis. Evaluation of the effectiveness of hip arthroplasty in order to improve the clinical and functional characteristics of the link hip joint – spine was carried out according to the Haris and Oswestry functional scales. Results. The analysis of the database of patients in them proved that the lumbar vertebrae at the L2-L4 level are more often affected. In hyperlordosis, degenerative lesions occur in the posterior column of the lumbar spine in the form of spondyloarthrosis, which is clinically manifested by lumbodynia; with hypolordosis, the anterior column suffers more, which is clinically manifested by the presence of lumboishalgia. Total arthroplasty of patients with hip-lumbar syndrome contributes to statistically significant (p≤0.05) reduction in pain syndrome and improvement of function both in the hip joint and the lower back. Residual, less intense, pain syndrome after arthroplasty was most intensive in patients with hypolordosis (24.11 points according to Oswestry’s classification). Сonclusions. The studies carried out to determine the role of spondyloarthrosis of the lumbar spine in the structure of pain after hip arthroplasty will contribute to the further development of a clinical diagnostic and therapeutic algorithm for patients with hip-lumbar syndrome.

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Zikos, Dimitrios, Ashara Shrestha, Taylor Colotti i Leonidas Fegaras. "A Supervised Pattern Analysis of the Length of Stay for Hip Replacement Admissions". Healthcare 7, nr 2 (6.04.2019): 58. http://dx.doi.org/10.3390/healthcare7020058.

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Hip replacement is the most common surgical procedure among Medicare patients in the US and worldwide. The hospital length of stay (LOS) for hip replacement admissions is therefore important to be controlled, contributing to savings for hospitals. This study combined medical claims and hospital structure and service data to examine LOS fluctuations and trends, and admission distribution patterns, during weekdays, for hip replacement cases. The study furthermore examined associations of these patterns with the LOS performance. Most hospitals were found to admit hip replacement cases at the start of the week (Monday through Wednesday). There is an upward LOS trend as we approach late weekday admissions. Multiple linear regression analysis showed that LOS weekday inconsistencies, a large proportion of hip replacement admissions on Thursday and Friday, the government ownership status, the bed size, and the critical access status are associated with an increased LOS. On the other hand, the rate of hip replacement admissions over total ones, and the hospital being accredited, are associated with a lower LOS. Findings stress out the need for hospitals to maintain an effective and balanced distribution of hip replacement admissions, evenly during the week, and the need for standardized case management, to avoid practice variability and, therefore, LOS fluctuations for their hip replacement cases.

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Eldesouky, Ibrahim, Hassan El-Hofy i Ola Harrysson. "Research: Design and Analysis of a Low-Stiffness Porous Hip Stem". Biomedical Instrumentation & Technology 51, nr 6 (1.11.2017): 474–82. http://dx.doi.org/10.2345/0899-8205-51.6.474.

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Abstract Two major problems are associated with total hip replacement: 1) stress shielding and 2) the adverse tissue reaction to certain elements of the implant material. In this regard, a porous implant provides lower stiffness and vacancies for bone ingrowth, making it more suitable for the human bone compared with a solid stem. Moreover, second-generation titanium biomedical alloys, such as TNZT (Ti35Nb7Zr5Ta) and TMZF (Ti12Mo6Zr2Fe), have been introduced to prevent the adverse tissue reactions related to aluminum and vanadium elements of the popular Ti6Al4V alloy. In the current work, an analysis was performed based on uniaxial compression testing of cubic Ti6Al4V structures of different porosities to predict the governing equations that relate the relative density of the structure to the mechanical properties of the structure according to the Gibson-Ashby model. A numerical study was conducted to evaluate the change in stress distribution obtained by incorporating the new titanium alloys in porous hip stem implants. Implants modeled with the mechanical properties of TNZT and TMZF showed a minimum safety factor of 1.69 and 3.02, respectively, with respect to the yield strength. The results demonstrated an increase in the equivalent von Mises stresses and maximum principal elastic strain up to 7% and 15%, respectively, compared with the porous Ti6Al4V implant and up to 108% and 156%, respectively, compared with the solid Ti6Al4V implant.

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Hoffmann, Florian. "HIP, RIP, and the robustness of empirical earnings processes". Quantitative Economics 10, nr 3 (2019): 1279–315. http://dx.doi.org/10.3982/qe863.

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The dispersion of individual returns to experience, often referred to as heterogeneity of income profiles (HIP), is a key parameter in empirical human capital models, in studies of life‐cycle income inequality, and in heterogeneous agent models of life‐cycle labor market dynamics. It is commonly estimated from age variation in the covariance structure of earnings. In this study, I show that this approach is invalid and tends to deliver estimates of HIP that are biased upward. The reason is that any age variation in covariance structures can be rationalized by age‐dependent heteroscedasticity in the distribution of earnings shocks. Once one models such age effects flexibly the remaining identifying variation for HIP is the shape of the tails of lag profiles. Credible estimation of HIP thus imposes strong demands on the data since one requires many earnings observations per individual and a low rate of sample attrition. To investigate empirically whether the bias in estimates of HIP from omitting age effects is quantitatively important, I thus rely on administrative data from Germany on quarterly earnings that follow workers from labor market entry until 27 years into their career. To strengthen external validity, I focus my analysis on an education group that displays a covariance structure with qualitatively similar properties like its North American counterpart. I find that a HIP model with age effects in transitory, persistent and permanent shocks fits the covariance structure almost perfectly and delivers small and insignificant estimates for the HIP component. In sharp contrast, once I estimate a standard HIP model without age‐effects the estimated slope heterogeneity increases by a factor of thirteen and becomes highly significant, with a dramatic deterioration of model fit. I reach the same conclusions from estimating the two models on a different covariance structure and from conducting a Monte Carlo analysis, suggesting that my quantitative results are not an artifact of one particular sample.

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Nasr, Riad, Eric Watelain, Antonio Pinti, Ghassan Maalouf, Abdel-Jalil Berro i Rawad El Hage. "Sarcopenia and Hip Structure Analysis Variables in a Group of Elderly Men". Journal of Clinical Densitometry 21, nr 2 (kwiecień 2018): 312–13. http://dx.doi.org/10.1016/j.jocd.2016.06.004.

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Adamczyk, Marcin, i Patrycja Rutkowska. "Analysis of the Foreign Policy of the Country through its Determinants, Structure and Instruments: Potential Research Scenarios". Historia i Polityka, nr 32 (39) (1.06.2020): 39. http://dx.doi.org/10.12775/hip.2020.013.

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Cui, Bing Yan, Li Wen Chen, Zhi Jun Wang, Yuan Hao Zhao, Li Zhan Xian i Zhen Lin Jin. "Analysis of Statics and Design of Structur Parameters for a Bionic Robot Hip Joint". Journal of Biomimetics, Biomaterials and Biomedical Engineering 22 (marzec 2015): 3–12. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.22.3.

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The hip joint is one of the body's important joints, most of the lower limb activities of the human body are inseparable from the hip joint, a novel bionic robot hip joint was proposed based on 3-DOF spherical parallel mechanism. The statics performance of the bionic robot hip joint was analyzed, and the structure parameters were designed. First, the static transmission equation of the bionic robot hip joint was established using the principle of virtual works, which simplifies the calculation process of the bionic robot hip joint. Further, using the norm in Matrix theory, the force Jacobian matrix was introduced into the statics performance evaluation index, and the statics performance evaluation index and the global torque performance evaluation index was defined, and the performance atlas of the statics performance evaluation index was plotted at the workspace of the bionic robot hip joint. Moreover the objective optimal function was established basing on the global torque performance evaluation index, and the relation of the objective optimal function and the global torque performance evaluation index were analyzed. By use of fully automatic searching method, the optimal structural parameter ranges of the bionic robot hip joint were obtained. Analysis results show that the bionic robot hip joint has good static transmission performance at initial position, and the static transmission performance is decreased with increasing the workspace. Finally, using a set of optimal structural sizes parameters, a novel bionic robot hip joint was designed, which established the theoretical foundation for the bionic robot design and apply.

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Wang, Feng. "Analysis of human mechanics structure in national Tai Chi movement". International Journal of Advanced Robotic Systems 17, nr 2 (1.03.2020): 172988142091506. http://dx.doi.org/10.1177/1729881420915069.

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Tai Chi is an excellent traditional culture of the Chinese nation and a treasure of traditional national sports. It has been developing since thousands of years and is increasingly loved by more and more people at home and abroad. Because of the development of the times and the influence of the change of value orientation of Tai Chi and other factors, people’s understanding of many problems of Tai Chi such as theory and method has been biased, which makes the idea of action and skill weakening and action not uniform in the process of inheritance and development of Tai Chi routines. Even the prescribed routines may be practiced and understood differently. To inherit, develop, and disseminate Tai Chi better, these traditional valuable experiences should be made scientific and standardized. With the help of the research method of sports human mechanics and advanced experimental instruments (Xsens MVN system), this article studies and analyzes the human mechanics of the main movements of traditional Yang and Wu Tai Chi, which are the most popular. This provides a scientific experimental basis for the technical research of Tai Chi. The results show that there is no significant difference between Wu-style Tai Chi and Yang-style Tai Chi practitioners in the percentage of body weight in front leg, knee joint, and sole pressure, but there is significant difference in the percentage of body weight in back leg. As a result, the foot pressure gap between Yang-style Tai Chi and Wu-style Tai Chi is smaller, while the foot pressure gap between Wu-style Tai Chi and Wu-style Tai Chi is larger. There were no significant differences in trunk force, front hip force, back hip force, front knee force, and back knee force ( p > 0.05).

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Ghiban, Brandusa. "Failure Modes of the Biometallic Materials - Case Study". Key Engineering Materials 752 (sierpień 2017): 111–16. http://dx.doi.org/10.4028/www.scientific.net/kem.752.111.

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Hip fractures/arthrosis were, still are and will be a challenge for the orthopedic surgeon. In this paper we conducted a case study on a rod used for hip replacement due to coxartrosis. The implant was used for hip replacement for NC patient aged 82 years. After twelve months the patient returns for the ablation of osteosynthesis material. Clinical and strengthen the fracture hip is found radiologic hypertrophic and degradation plaque. It was used a rod implant, on which were made following investigations in order to establish the causes that led to the fracture, namely: determining the chemical composition through spectral analysis, analysis macrostructural in stereo, microstructural analysis optical microscope metallographic respectively analysis fractogr aphic electron microscope streak. Complex analysis of the fracture surfaces of the hip prosthesis has led to the ultimate conclusion that the material has been made the hip prosthesis is inadequate chemical purity satisfactory embedding, which has led to breakage within an area of non-homogeneous structure.

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Beck, Thomas J., Thomas Fuerst, Kenneth W. Gaither, Santosh Sutradhar, Amy B. Levine, Teresa Hines, Ching-Ray Yu, Robert Williams, Sebastian Mirkin i Arkadi A. Chines. "The effects of bazedoxifene on bone structural strength evaluated by hip structure analysis". Bone 77 (sierpień 2015): 115–19. http://dx.doi.org/10.1016/j.bone.2015.04.027.

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Yang, Yan, Hu Yong Li i Ya Ping Wu. "Experimental Study on the Mechanical Behavior of Truncated Hip Structure". Applied Mechanics and Materials 578-579 (lipiec 2014): 488–92. http://dx.doi.org/10.4028/www.scientific.net/amm.578-579.488.

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Based on the characteristics of organic glass, organic glass plate is adopted to establish the test model, and through the static stress and strain values of stress and strain test model, the theory is simulated by using ANSYS finite element software, at the same time, through the theoretical analysis and the method of combining the structure model test, the truncated hip structure, the mechanical properties of special section.

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Varela, Jaime, Jorge Merino, Christina Pickett, Ahmad Abu-Issa, Edel Arrieta, Lawrence E. Murr, Ryan B. Wicker, Magnus Ahlfors, Donald Godfrey i Francisco Medina. "Performance Characterization of Laser Powder Bed Fusion Fabricated Inconel 718 Treated with Experimental Hot Isostatic Processing Cycles". Journal of Manufacturing and Materials Processing 4, nr 3 (21.07.2020): 73. http://dx.doi.org/10.3390/jmmp4030073.

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Inconel 718 alloy fabricated by selective laser melting (SLM) (or laser powder-bed fusion (LPBF)) has been post-process heat-treated by stress-relief anneal at 1065 °C; stress-relief anneal (1065 °C) + solution treatment (at 720 °C) + aging (at 620 °C); hot isostatic pressing (HIP) (at 1120–1200 °C); stress-relief anneal + HIP; and stress-relief anneal + HIP + solution treatment + aging. Microstructure analysis utilizing optical metallography revealed primarily equiaxed grain structures (having average diameters ranging from ~30 to 49 microns) containing annealing twins, and a high concentration of carbide precipitates in all HIP-related treatments in the grain boundaries and intragrain regions. However, no precipitates nucleated on the {111} coherent annealing twin boundaries because of their very low interfacial free energy in contrast to regular grain boundaries. The mechanical properties for the as-fabricated Inconel 718 exhibited a yield stress of 0.64 GPa, UTS of 0.98 GPa, and elongation of 26%. Following stress-relief anneal at 1065 °C, the yield stress dropped to 0.60 GPa, while the elongation increased to 43%. The associated grain structure was an irregular, somewhat elongated, recrystallized structure. This structure was preserved at a stress anneal at 1065 °C + solution treatment + aging, but grain boundary and intragrain precipitation resulted in a doubling of the yield stress to 1.3 GPa and a reduced elongation of 12.6%. The results of HIP-related post-process heat treatments involving temperatures above 1060 °C demonstrated that the yield stress and elongations could be varied from 1.07 to 1.17 GPa and 11.4% to 19%, respectively. Corresponding Rockwell C-scale hardness values also varied from 33 for the as-fabricated Inconel 718 to 53 for simple post-process HIP treatment at 1163 °C.

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Danielson, Michelle E., Thomas J. Beck, Yinjuan Lian, Arun S. Karlamangla, Gail A. Greendale, Kristine Ruppert, Joan Lo, Susan Greenspan, Marike Vuga i Jane A. Cauley. "Ethnic variability in bone geometry as assessed by hip structure analysis: Findings from the hip strength across the menopausal transition study". Journal of Bone and Mineral Research 28, nr 4 (18.03.2013): 771–79. http://dx.doi.org/10.1002/jbmr.1781.

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Barr, R. J., J. S. Gregory, K. Yoshida, S. Alesci, R. M. Aspden i D. M. Reid. "426 CORRELATIONS BETWEEN HIP STRUCTURE ANALYSIS AND ACTIVE SHAPE MODELLING IN SUBJECTS WITH OSTEOARTHRITIS". Osteoarthritis and Cartilage 18 (październik 2010): S190. http://dx.doi.org/10.1016/s1063-4584(10)60453-0.

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Shepherd, John, Bo Fan, Mike Lewiecki, Paul Miller i Harry Genant. "Hip Structure Analysis Precision and Agreement between the Hologic and GE-Lunar DXA Systems". Journal of Clinical Densitometry 18, nr 3 (lipiec 2015): 429–30. http://dx.doi.org/10.1016/j.jocd.2015.05.023.

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Ramamurthi, K., O. Ahmad, K. Engelke, R. H. Taylor, K. Zhu, S. Gustafsson, R. L. Prince i K. E. Wilson. "An in vivo comparison of hip structure analysis (HSA) with measurements obtained by QCT". Osteoporosis International 23, nr 2 (11.03.2011): 543–51. http://dx.doi.org/10.1007/s00198-011-1578-1.

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Gajko, G. V., O. V. Kalashnikov, T. V. Nizalov, R. A. Kozak i P. S. Chernyak. "THE ROLE OF DISCOGENOUS RADICULOPATHIES AND SPONDYLOLYSTHESIS IN THE STRUCTURE OF PAIN SYNDROME AFTER TOTAL HIP ARTHROPLASTY". Problems of traumatology and osteosynthesis, nr 1(20) (1.07.2021): 47–64. http://dx.doi.org/10.51309/2411-6858-2021-20-1-47-64.

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Resume. In the structure of complications, pain syndrome, which is not associated with instability of the components of the endoprosthesis or infection, remains a serious problem due to difficulties in diagnosis and treatment. The cause of residual pain may be the presence in the patient of discogenic radiculopathy or spon-dylolisthesis of the lumbar spine. The aim of the study. To determine the role of discogenic radiculopathies and spondylolisthesis of the lumbar spine in the structure of pain after hip arthroplasty. Materials and methods. A sample and retrospective analysis of case histories of 138 patients with hip and lumbar syndrome, who under-went hip arthroplasty in the clinic of orthopedics and traumatology of adults SI "ITO NAMS of Ukraine". All patients were examined clinically and radiologically. Additionally, all patients were examined by a neurolo-gist to determine the neurological status of patients, diagnosis. Evaluation of the effectiveness of treatment of patients with residual effects of discogenic radiculopathy and spondylolisthesis after hip arthroplasty was performed on the functional scale of Oswestry. Results. The analysis of the patient database revealed a statisti-cally significant (p≤0.05) predominance of patients with the presence of disc herniation at the level of L3-L4 and hypolordosis. The survey revealed 9 cases of discogenic radiculopathy and 6 cases of spondylolisthesis in patients with PD, which amounted to 6.5% and 4.5% of the total number of examined patients. The high effi-ciency of the developed treatment-and-prophylactic measures in patients with discogenic radiculopathy or spondylolisthesis and lumbar-lumbar syndrome has been determined. Timely appointment of complex conserva-tive and operative methods allowed to achieve satisfactory results in 100% of cases. Conclusions. Studies to determine the role of discogenic radiculopathy and spondylolisthesis of the lumbar spine in the structure of pain after hip arthroplasty will contribute to the further development of clinical, diagnostic and treatment algorithms for patients with hip and lumbar syndrome.

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Kamal, Hanan M., Hoda A. Atwa, Omar M. Saleh i Faten A. Mohamed. "Echocardiographic evaluation of cardiac structure and function in obese Egyptian adolescents". Cardiology in the Young 22, nr 4 (2.12.2011): 410–16. http://dx.doi.org/10.1017/s1047951111001910.

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AbstractObjectiveThe objective of this study was to detect structural and functional changes in the left and right ventricles in obese Egyptian adolescents.Methods and resultsAnthropometric and echocardiographic parameters, including tissue Doppler imaging, were obtained from 70 obese adolescents with average body mass index of 34 plus or minus 3.8 and compared with 50 age- and sex-matched controls, with a body mass index of 21.6 plus or minus 1.9. Cardiac dimensions, stroke volume, left ventricular and right ventricular systolic and diastolic functions were evaluated. The obese group had a higher end-diastolic septal and posterior wall thickness and left ventricular mass index than the non-obese group. Body mass index, mid-arm and hip circumference values showed significant correlations with these echocardiographic variables. Systolic and diastolic functions of the left ventricle were normal in both groups, although stroke volume was high in the obese group. The right ventricle tissue Doppler parameters were similar in both groups. However, the S wave of the septal/lateral tricuspid valve annulus was reduced in the obese group, but not to the level reflecting systolic dysfunction. This was inversely correlated with hip, waist, and mid-arm circumference. Stepwise multiple regression analysis showed that the mid-arm and hip circumference followed by the body mass index are significant predictors of these early cardiac abnormalities.ConclusionLeft ventricular hypertrophy is present in obese children, although both systolic and diastolic functions are normal. Tissue Doppler imaging revealed a minor, but still significant, reduction in the right ventricular systolic function. Mid-arm and hip circumference are predictors of left ventricular hypertrophy.

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Simon, J. P., J. Vander Sloten, R. Van Audekercke, G. Van Der Perre, R. S. M. Ling, G. A. Gie i G. Fabry. "Finite Element Analysis Applied to Bone Remodelling in Revision Arthroplasty of the Femur using Morselized Allograft and Cement". HIP International 8, nr 2 (styczeń 1998): 51–61. http://dx.doi.org/10.1177/112070009800800211.

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Finite element models have extensively been developed and reported for primary cemented and uncemented total hip replacement, but not for revision arthroplasty of the hip. A two-dimensional equivalent thickness model was developed of the proximal femur with bone grafts, a thin but uniform cement layer and a standard femoral component. This model represents the reconstructed femoral revision setting described by Gie et al (1). The effects of surface texture, cement-stem friction, cement creep and stem malplacement were evaluated. Within the range of coefficients of friction which was investigated in this study (0.03, 0.136 and 0.3) it was observed that the influence of the value of the coefficient upon the stresses in the bone-implant structure are less than 5%. Also static cement creep and certain stem malalignments which were simulated showed a relatively small influence upon the stress distribution within this structure. An agreement between trabecular orientations in the remodeled bone allograft and the principal stress orientations in this structure was observed in the calcar region. It was concluded that the remodelling which occurs in the bone allografts follows Wolff's law of optimal material use in the trabecular structure.

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Druz, N. V. "ОСОБЛИВОСТІ БУДОВИ КІСТОК ТАЗОСТЕГНОВОГО СУГЛОБА ПТАХІВ, ЯК ОКРЕМОЇ ЛАНКИ ЛОКОМОТОРНОГО АПАРАТА". Scientific Messenger of LNU of Veterinary Medicine and Biotechnology 18, nr 3(70) (5.09.2016): 88–91. http://dx.doi.org/10.15421/nvlvet7020.

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This article is dedicated to the study of the structure, ways of formation of bone structures that form the basis of locomotor organs, namely the hip joint, the elucidation of mechanisms of their development, because they provide their reliable functioning. The study of the structural features of the skeleton of birds in comparison to other animals makes it possible to understand the phylogeny as an adaptive process that is the basis of evolution at all.Theoretical generalization of structural features of birds’ hip joint that are characterized by different types of biomorphological adaptations, such as the type and speed of ground movement in the habitat, are presented in the article. This new position allows analyzing the processes of differentiation and transformation of muscles and skeletal elements of birds’ hip joint, which are functioning and developing under the influence of various external factors.The summarized results of the original systematic morpho–functional and morpho–ecological study of hip bones as the main unit of bipedal locomotion of the Class Aves, is given. A detailed comparative description of skeletal elements of birds’ hip joint, that accompanied by unique historical overview which covers more than two–thousand–year period, is provided for the first time. The analysis of some significant morphological structures, which gives clues to the reconstruction of adaptive evolution of any group of birds, is given.

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Feenstra, M. "Case control analysis of the relationship between hip anatomical structure and function associated with LBP". Journal of Science and Medicine in Sport 9 (grudzień 2006): 5. http://dx.doi.org/10.1016/j.jsams.2006.12.007.

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Mochizuki, Takeshi, Koichiro Yano, Katsunori Ikari, Kosei Kawakami, Ryo Hiroshima, Naoko Koenuma, Mina Ishibashi i Toshikatsu Shirahata. "Hip structure analysis by DXA of teriparatide treatment: A 24-month follow-up clinical study". Journal of Orthopaedics 13, nr 4 (grudzień 2016): 414–18. http://dx.doi.org/10.1016/j.jor.2016.09.001.

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Cheng, G., J.-L. Yu, S.-R. Ge i S. Zhang. "Workspace analysis of 3SPS+1PS bionic parallel test platform for hip joint simulator". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, nr 9 (27.06.2011): 2216–31. http://dx.doi.org/10.1177/0954406211404864.

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In order to evaluate the movement performance of a human hip joint, a novel parallel manipulator called 3SPS+1PS bionic parallel test platform is proposed in this article. SPS denotes the spherical-prismatic-spherical leg, and PS the prismatic-spherical leg where only the prismatic joint is actuated and hence underlined. For the 3SPS+1PS bionic parallel test platform with four degrees of freedom including three rotations and one translation, the formulae for solving the inverse kinematics equations are derived based on the quaternion method. Unit quaternion is used to represent the position and orientation of a moving platform, and singularities caused by Euler angles are avoided. Combining the topological structure characteristics of the parallel manipulator, the orientation workspace of the moving platform at a given translation position is constructed. Moreover, the procedures to solve and evaluate the orientation workspace of the parallel manipulator are obtained. In order to ensure dexterity and obtain more workspace, the condition index is studied by the condition number and singular values analysis of the dimensionally homogeneous Jacobi matrix. The parallel manipulator has three rotations about the Z-axis, the Y-axis, and the X-axis applied to represent three rotation motions (flexion/extension (FE), abduction/adduction (AA), and internal/external (IE) rotation motion) of a human hip joint, respectively. The numerical results illustrate that the 3SPS + 1PS bionic parallel test platform generates ±25° to ±108° in FE, −20° to 20° in AA, and −21° to 21° in IE rotation where the maximum permissible condition numbers of Jacobi matrix are set within the range 15–20 and the parallel manipulator can provide full-scale friction motion for hip joint simulator. In the dexterous orientation workspace, the slide track on the friction counterface of hip joint prostheses can be varied consistently. By verifying the lengths of the SPS-type active legs, the parallel manipulator can provide cross-path multidirectional slide motion for hip joint prostheses. The three-dimensional model and kinematics simulation of the manipulator are established and analysed. The simulation results prove that the 3SPS + 1PS bionic parallel test platform can accurately represent human hip joint motion and provide more reliable experimental data for hip joint prostheses in clinical application. The research builds the theoretical basis for its bionic motion simulation in practical application.

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Simon, Ágota, i Lilla Asztalos. "Damage Analysis of Broken Orthopedic Implants". Acta Materialia Transylvanica 3, nr 2 (1.10.2020): 98–102. http://dx.doi.org/10.33924/amt-2020-02-09.

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Abstract Joint implants and fixings are subject to many stresses throughout their life cycle. Despite careful design, material selection, manufacturing technology and proper surgical technology, implant damage and, in extreme cases, fracture can occur. Investigation of injuries is important from the perspective of the patient, the care provider and the manufacturer, among other things, by exploring the cause of the fracture to prevent similar cases. In the present study we performed failure analysis of a hip implant and a bone fixation plate. Fracture surfaces, material composition, material structure and hardness were also investigated. Based on the work done, we determined what might have led to the fracture in both cases.

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Hedbávný, Petr, Dušan Hupka i Jana Sklenaříková. "Analýza balancování stoje na rukou". Studia sportiva 7, nr 1 (1.07.2013): 51–62. http://dx.doi.org/10.5817/sts2013-1-6.

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The research was focused on analyzing balancing in handstand, as one of the fundamental physical structure sports gymnastics. With this research dealt many authors, but without application in practice.Its specificity is determined from the mechanical point of gravity height, the size of the support surface and the overall equilibrium position in which maintain stability. The aim of the project was to optimize the training of standing on their hands, depending on the strategy of maintaining a balance in this unstable static physical structure. For a comprehensive analysis of handstands is utilized synchronized 3D kinematic analysis, stabilomathric measuring and EMG, which we were reveal the inner essence of outer performance of technique. It was a case study and the tested person was a gymnast of student category and we focused on changes in the angle of the hip joint ("shoulder - hip - knee") and shoulder joint ("wrist - shoulder - hip") in connection with the muscle activity observed muscles and muscle groups. Now the application of this knowledge in practice, we can optimize the training, which in some cases lengthy.

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Lazarev, A. F., A. O. Ragozin, E. I. Solod, M. G. Kakabadze, A. F. Lazarev, A. O. Ragozin, E. I. Solod i M. G. Kakabadze. "Peculiarities of Total Hip Replacement in Femur Neck Fractures". N.N. Priorov Journal of Traumatology and Orthopedics 10, nr 2 (15.06.2003): 3–8. http://dx.doi.org/10.17816/vto20031023-8.

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Biomechanic conception of implant choice for primary total hip replacement in osteoporotic femur neck fractures is presented. Criterion for the choice is a localization of load-bearing surface of dense structure in acetabulum roof zone, i.e. sursile. Absolute indications to total hip replacement, use of bipolar and unipolar hemiprostheses are determined depending on the direction and deviation degree of sursile from horizontal axis of pelvis. Based on suggested conception the retrospective analysis of joint replacement results in 58 patients has been performed. The causes of protrusion and loosing of implants were studied.

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Marshall, Amelia Rose, Marcos de Noronha, Anita Zacharias, Theo Kapakoulakis i Rodney Green. "Structure and function of the abductors in patients with hip osteoarthritis: Systematic review and meta-analysis". Journal of Back and Musculoskeletal Rehabilitation 29, nr 2 (27.04.2016): 191–204. http://dx.doi.org/10.3233/bmr-150614.

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Folkestad, L., S. Hansen, C. Ejersted, J. D. Hald, B. Langdahl, J. Gram, B. Abrahamsen i K. Brixen. "Hip structure analysis in patients with osteogenesis imperfecta compared with age and sex matched healthy controls". Bone 48 (maj 2011): S240. http://dx.doi.org/10.1016/j.bone.2011.03.576.

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Alam, Imranul, Qiwei Sun, Lixiang Liu, Daniel L. Koller, Yunlong Liu, Howard J. Edenberg, Michael J. Econs, Tatiana Foroud i Charles H. Turner. "Genomic expression analysis of rat chromosome 4 for skeletal traits at femoral neck". Physiological Genomics 35, nr 2 (październik 2008): 191–96. http://dx.doi.org/10.1152/physiolgenomics.90237.2008.

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Hip fracture is the most devastating osteoporotic fracture type with significant morbidity and mortality. Several studies in humans and animal models identified chromosomal regions linked to hip size and bone mass. Previously, we identified that the region of 4q21-q41 on rat chromosome (Chr) 4 harbors multiple femoral neck quantitative trait loci (QTLs) in inbred Fischer 344 (F344) and Lewis (LEW) rats. The purpose of this study is to identify the candidate genes for femoral neck structure and density by correlating gene expression in the proximal femur with the femoral neck phenotypes linked to the QTLs on Chr 4. RNA was extracted from proximal femora of 4-wk-old rats from F344 and LEW strains, and two other strains, Copenhagen 2331 and Dark Agouti, were used as a negative control. Microarray analysis was performed using Affymetrix Rat Genome 230 2.0 arrays. A total of 99 genes in the 4q21-q41 region were differentially expressed ( P < 0.05) among all strains of rats with a false discovery rate <10%. These 99 genes were then ranked based on the strength of correlation between femoral neck phenotypes measured in F2 animals, homozygous for a particular strain's allele at the Chr 4 QTL and the expression level of the gene in that strain. A total of 18 candidate genes were strongly correlated (r2 > 0.50) with femoral neck width and prioritized for further analysis. Quantitative PCR analysis confirmed 14 of 18 of the candidate genes. Ingenuity pathway analysis revealed several direct or indirect relationships among the candidate genes related to angiogenesis (VEGF), bone growth (FGF2), bone formation (IGF2 and IGF2BP3), and resorption (TNF). This study provides a shortened list of genetic determinants of skeletal traits at the hip and may lead to novel approaches for prevention and treatment of hip fracture.

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Popov, Vladimir V., Mikhail L. Lobanov, Stepan I. Stepanov, Yuanshen Qi, Gary Muller-Kamskii, Elena N. Popova, Alexander Katz-Demyanetz i Artemiy A. Popov. "Texturing and Phase Evolution in Ti-6Al-4V: Effect of Electron Beam Melting Process, Powder Re-Using, and HIP Treatment". Materials 14, nr 16 (10.08.2021): 4473. http://dx.doi.org/10.3390/ma14164473.

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The research demonstrates microstructural changes and development of specific texture in Ti-6Al-4V specimens produced by electron beam melting (EBM) under different conditions. The effect of two factors, namely, raw material (powder) recycling and hot isostatic pressing (HIP), on the EBM produced samples structure and properties, has been explored. The as-printed and treated samples were investigated using electron backscattered diffraction (EBSD) analysis. Modification of mechanical properties after the EBM and HIP are explained by the EBSD data on microstructural phenomena and phase transformations. The work is devoted to assessing the possibility of reusing the residual titanium alloy powder for the manufacture of titanium components by the combination of EBM and HIP methods.

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Maccauro, G., L. Pilloni, L. Petrella, L. Proietti, V. De Santis, F. Muratori i C. Piconi. "Ultrastructural Analysis of Retrieved Ceramic Ball Heads". HIP International 13, nr 4 (październik 2003): 224–28. http://dx.doi.org/10.1177/112070000301300405.

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Surface modification of alumina heads retrieved for aseptic loosening (6 cases) has been analysed using scanning electron microscopy, coupled with energy dispersive X-ray microanalysis. Ultrastructural analysis showed the presence of voids with grain detachment on all the retrieved cups and also in those cases in which macroscopic signs of wear were absent. The preservation of the macroscopic integrity of ceramic structure is an essential condition for long-time survival of total hip replacement, even if ceramic may also play a role in PE damage for the abrasive effects of grains. Macroscopic wear observed in two cases is not related to degradation of ceramic material but to other factors connected to surgery.

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Moradell, A., A. Gómez-Cabello, A. Gómez-Bruton, B. Muniz-Pardos, J. Marín Puyalto, A. Matute-Llorente, A. Gónzalez-Agüero, I. Ara, J. A. Casajús i G. Vicente-Rodríguez. "Associations between Physical Fitness, Bone Mass, and Structure in Older People". BioMed Research International 2020 (15.07.2020): 1–8. http://dx.doi.org/10.1155/2020/6930682.

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The main aim was to analyse the associations between several physical fitness variables and bone parameters in a sample of elderly people. 129 participants (94 females and 35 males, 76.2±5.4 y) from the EXERNET cohort of Zaragoza (Spain) were included in the study. Physical fitness was assessed using the Senior Fitness Test Battery. Peripheral quantitative computed tomography (pQCT) at the tibia and dual-energy X-ray absorptiometry (DXA) at the hip and lumbar spine were used to assess bone and muscle parameters. Partial correlations were used to describe the associations between fitness and bone parameters. A stepwise regression analysis was used to determine the influence of fitness variables on bone parameters. In males, significant correlations were found between lower body strength and agility with bone total mineral density (Tt.BMD) (r=0.41 and -0.50) and cortical thickness (r=0.40 and -0.50, respectively) and walking speed with total and cortical density (r=−0.41 and -0.40, respectively), all measured at tibia (all p<0.05). Regarding DXA, neck areal bone mineral density (aBMD) correlated with flexibility (r=−0.37) and walking speed (r=0.39) and Ward’s triangle with walking speed (r=0.39). Agility predicted Tt.BMD and cortical thickness (r2 change=24.8% and 23.0%), while walking speed predicted cortical bone mineral density (r2 change=19.5%) (all p<0.05). Females showed correlations between balance and total hip aBMD (r=0.27) and trochanter aBMD (r=0.25). Balance predicted trochanter (r2 change=4.2%) and total hip aBMD (r2 change=4.9%) (both p<0.05). In conclusion, bone mass in elderly males seems to be more influenced by physical fitness than in females, being agility and walking speed the variables showing greater associations. Other variables should be taken into account in females for future research.

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BASHA, SHAIK AKBAR, i DEBASISH SARKAR. "COMPETITIVE LIFE TIME ASSESSMENT OF SrO-ZTA/SrO-ZTA AND CoCrMo/UHMWPE HIP PROSTHESIS BEARINGS". Journal of Mechanics in Medicine and Biology 20, nr 03 (kwiecień 2020): 2050009. http://dx.doi.org/10.1142/s0219519420500098.

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The hip joint envisages the prime load bearing structure among other joints in the human body. Hip joint failure leads to the replacement of the hip joint prosthesis. This research work focuses on the proper selection of bearing couple materials for the hip joint to improve the performance and life. Herein, the stress and deformation of different bearing couple materials are analysed in the perspective of transient dynamic analysis under jogging load cycle. Selective hip joint bearing (femoral head-liner) couples are SS316L on UHMWPE (MoP), CoCrMo on UHMWPE (MoP), Ti6Al4V on SrO-ZTA (MoC), SrO-ZTA on UHMWPE (CoP) and SrO-ZTA on SrO-ZTA (CoC) encountered, respectively. The SrO-ZTA on SrO-ZTA (CoC) bearing couple generates the less Von Mises stress of 180.88 MPa. Load bearing pressure and Archard law predict the wear depth of CoCrMo on UHMWPE (MoP) and SrO-ZTA on SrO-ZTA (CoC) bearing couples are 0.141 mm/year and 0.031 mm/year, respectively. In simultaneous, the theoretical wear volume for CoCrMo on UHMWPE (MoP) and SrO-ZTA on SrO-ZTA (CoC) bearing couples are found as 35.46[Formula: see text]mm3/year and 2.62[Formula: see text]mm3/year, respectively. The wear depth and wear volume are supporting the available clinical retrievals and exist in well acceptable range. Competitive wear analysis data ensures 15 years safe life of SrO-ZTA on SrO-ZTA (CoC) hip prosthesis bearing.

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Ertuğrul, Onur, Zafer Çağatay Öter, Mustafa Safa Yılmaz, Ezgi Şahin, Mert Coşkun, Gürkan Tarakçı i Ebubekir Koç. "Effect of HIP process and subsequent heat treatment on microstructure and mechanical properties of direct metal laser sintered AlSi10Mg alloy". Rapid Prototyping Journal 26, nr 8 (26.06.2020): 1421–34. http://dx.doi.org/10.1108/rpj-07-2019-0180.

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Purpose The purpose of this paper is to evaluate the effect of post process combinations, e.g. hot isostatic pressing (HIP) only, HIP + T6 heat treatments, and T6 only, with different aging time, on surface properties, microstructure and mechanical properties of stress-relieved AlSi10Mg parts produced by direct laser metal sintering. Design/methodology/approach HIP process and HIP + T6 heat treatments were applied to as stress-relieved direct laser metal sintered (DMLS) AlSi10Mg parts. Aging times of 4 and 12 h are selected to examine the optimum duration. To analyze the advantages of HIP process, a T6 heat treatment with 4 h of aging was also applied. Densities, open porosities and roughness values of as stress-relieved, HIPed, HIP + T6, and T6-only samples were measured. The samples were characterized by OM and SEM together with EDX analysis. An image analysis study was made to evaluate the inner pore structure, thereby to understand the mechanical behavior. Findings HIP process does not cause a significant change in surface porosity; yet it has a positive influence on inner porosity. HIP process results in a microstructure of the aluminum matrix surrounded by a network of micron and nano size Si particles. Additional heat treatment results in larger particles and precipitation. After HIPing, ductility increases but strength decreases. Samples aged 4 h present improved yield and tensile strength but decreased elongation, yet samples aged for 12 h reach a combination of optimum strength and ductility. The lower level of tensile strength and ductility in T6-only condition indicates that HIP process plays a crucial role in elimination of the porosity thus improves the effectiveness of subsequent heat treatment. Originality/value The study investigates the effect of post-process conditions and optimizes the aging time of the T6 heat treatment after HIP process in order to obtain improved mechanical properties. The stress-relieved state was chosen as the reference to prevent distortion during HIPing or heat treatment.

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Ark, R., i M. Bukhari. "POS0511 USING HIP STRUCTURAL ANALYSIS MEASUREMENTS TO PREDICT FRACTURE IN RHEUMATOID ARTHRITIS". Annals of the Rheumatic Diseases 80, Suppl 1 (19.05.2021): 488.2–489. http://dx.doi.org/10.1136/annrheumdis-2021-eular.802.

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Background:Rheumatoid arthritis (RA) is a chronic inflammatory autoimmune disease and increases the risk of developing osteoporosis. Incidence of fracture is higher in this group of patients compared to the general population and can lead to increased morbidity (1). Bone strength of the proximal femur is not only linked to bone mineral density; it also depends on the geometric properties of the bone mass (2). Hip structural analysis (HSA) is a technique used to assess hip bone structure that takes geometric measurements of the femur from dual-energy X-ray absorptiometry (DEXA) images (3).Objectives:To determine whether HSA measurements help predict fracture in patients with RA.Methods:Data were collected from June 2004 to August 2017 from RA patients who underwent a DEXA scan at a District General Hospital. This included hip axis length (HAL), cross-sectional area (CSA), cross-sectional moment of inertia (CSMI), distance from centre of femoral head to centre of femoral neck (D1) and to inter-trochanteric line (D2), mean femoral neck diameter (D3), shaft angle (A) neck/shaft angle (Θ) and proximal femur strength index (SI) and distance from centre of mass of femoral neck to superior neck margin (Y). Fracture was predicted by a series of binomial logistic regression models, adjusted for sex, age and bone mineral density (BMD). Odds ratios with 95% confidence intervals and area under the receiver operating characteristic curve (AUC) were calculated.Results:2077 patients with RA were identified, 1632 were female and the mean age was 66.7. HAL, D1, D2, D3, A, Θ and Y were not significant predictors of fracture in regression models; odds ratios are included in table 1. CSA, CSMI and SI predicted fracture risk. The AUC for CSA, CSMI and SI regression models were 0.632, 0.609 and 0.625 respectively.Table 1.Odds ratios of fracture for different HSA parameters in RA patientsHSA ParameterOdds Ratio (95% Confidence Interval)HAL1.01410 (0.99958 - 1.02883)CSMI0.99994 (0.99990 - 0.99998)CSA0.98523 (0.98065 - 0.98982)D11.01683 (0.98925 - 1.04518)D21.01286 (0.99886 - 1.02705)D31.00664 (0.96958 - 1.04511)Y1.04580 (0.98633 - 1.10886)A1.00898 (0.98878 - 1.02959)Θ1.00276 (0.98672 - 1.01906)SI0.56769 (0.43400 - 0.74258)Figure 1.Receiver operating characteristic curves for CSA (red), CSMI (green) and SI (blue). AUC for CSA was 0.632, CSMI-0.609 and SI-0.625.Conclusion:These data suggest that CSA, CSMI and SI help predict the fracture risk in patients with RA. HAL, D1, D2, D3, A, Θ and Y do not predict risk of fracture. The CSA regression model was the strongest predictor of fracture. HSA measurements can therefore help predict risk of fracture in conjunction with other factors. Limitations of the study are that it was retrospective and only studied patients who had a DEXA scan.References:[1]Xue A, Wu S, Jiang L, Feng A, Guo H, Zhao P. Bone fracture risk in patients with rheumatoid arthritis: A meta-analysis. Medicine. 2017; 96 (36): e6983. Available from: doi: 10.1097/MD.0000000000006983.[2]Faulkner KG, Wacker WK, Barden HS, Simonelli C, Burke PK, Ragi S, Del Rio L. Femur strength index predicts hip fracture independent of bone density and hip axis length. Osteoporos Int. 2006;17(4):593-9. doi: 10.1007/s00198-005-0019-4.[3]Kaptoge S, Beck TJ, Reeve J, Stone KL, Hillier TA, Cauley JA, et al. Prediction of Incident Hip Fracture Risk by Femur Geometry Variables Measured by Hip Structural Analysis in the Study of Osteoporotic Fractures. Journal of Bone and Mineral Research. 2008; 23 (12): 1892-1904. Available from: doi: https://doi.org/10.1359/jbmr.080802.Disclosure of Interests:None declared

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Souza, Flávio, Braulio Couto, Felipe Leandro Andrade da Conceição, Gabriel Henrique Silvestre da Silva, Igor Gonçalves Dias, Rafael Vieira Magno Rigueira, Gustavo Maciel Pimenta i in. "Automated Risk Analysis of Surgical Site Infection in Hip Arthroplasty Surgeries". Infection Control & Hospital Epidemiology 41, S1 (październik 2020): s135—s136. http://dx.doi.org/10.1017/ice.2020.649.

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Background: In 7 hospitals in Belo Horizonte, a city with >3,000,000 inhabitants, a survey was conducted between July 2016 and June 2018, focused on surgical site infection (SSI) in patients undergoing arthroplasty surgery procedures. The main objective is to statistically evaluate such incidences and enable a study of the prediction power of SSI through pattern recognition algorithms, the MLPs (multilayer perceptron). Methods: Data were collected on SSI by the hospital infection control committees (CCIHs) of the hospitals involved in the research. All data used in the analysis during their routine SSI surveillance procedures were collected. The information was forwarded to the NOIS (Nosocomial Infection Study) Project, which used SACIH automated hospital infection control system software to collect data from a sample of hospitals participating voluntarily in the project. After data collection, 3 procedures were performed: (1) a treatment of the database collected for the use of intact samples; (2) a statistical analysis on the profile of the hospitals collected; and (3) an assessment of the predictive power of 5 types of MLP (backpropagation standard, momentum, resilient propagation, weight decay, and quick propagation) for SSI prediction. MLPs were tested with 3, 5, 7, and 10 hidden layer neurons and a database split for the resampling process (65% or 75% for testing and 35% or 25% for validation). The results were compared by measuring AUC (area under the curve; range, 0–1) presented for each of the configurations. Results: Of 1,246 records, 535 were intact for analysis. We obtained the following statistics: the average surgery time was 190 minutes (range, 145–217 minutes); the average age of the patients was 67 years (range, 9–103); the prosthetic implant index was 98.13%; the SSI rate was 1.49%, and the death rate was 1.21%. Regarding the prediction power, the maximum prediction power was 0.744. Conclusions: Despite the considerable loss rate of almost 60% of the database samples due to the presence of noise, it was possible to perform relevant sampling for the profile evaluation of hospitals in Belo Horizonte. For the predictive process, some configurations have results that reached 0.744, which indicates the usefulness of the structure for automated SSI monitoring for patients undergoing hip arthroplasty surgery. To optimize data collection and to enable other hospitals to use the SSI prediction tool (available in www.sacihweb.com ), a mobile application was developed.Funding: NoneDisclosures: None

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Zou, Ping, i Shi Gang Wu. "The Analysis of Structural Mathematical Model of Suitable Female Jacket Design Based on Waist and Hip". Advanced Materials Research 331 (wrzesień 2011): 599–602. http://dx.doi.org/10.4028/www.scientific.net/amr.331.599.

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Computer application technology which is changing with each passing day has shown strong vitality, and garment CAD technology has become the inevitable trend in garment industry and it is accelerating economic development. The relation between control parts and details for female jacket structure was established by applying stepwise regression and using C++ language. By comparing between different mathematical models, it was discovered the waist and hip had more influence to the small bust female jacket structural design. The conclusion will provide the garment pattern making experience for clothing enterprises, and it will provide data basis for garment CAD technology.

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Liu, Fang, Wen Ming Cheng i Lan He. "Finite Element Analysis of Portable Exoskeleton Based on Ergonomics Parameters Model". Applied Mechanics and Materials 215-216 (listopad 2012): 168–73. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.168.

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Improvement of Weight capacity and weight-bearing exercise endurance in human are the main purpose of Portable Exoskeleton. The object of study is the Exoskeletons mechanical structure and through it to improve the structure bearing capacity. Firstly, this study takes the data of Chinese adult body size as the related parameters in ergonomics of Exoskeleton. Also the ergonomics parameters of pivotal bearing parts such as hip, thighs and legs will be confirmed according to the 50 percentage data of the data of Chinese adult body size. Based on it, 3D model of Portable Exoskeleton have been established by using Solidworks software and fast assembly of Exoskeleton’s parts have been accomplished. At the same time 3D Model have been conversed the x_t format and to be guided into the ANSYS software. A finite element based strength analysis of the mechanical structure of the external skeletal is then achieved with the load being 800N and the operating condition being one-leg standing. The numerical results show that key parts of the external skeletal meet the requirements. The maximum stress value is 127Mpa by ignoring the stress concentration phenomenon, confirming the reasonability of the structure design. Nevertheless, stress value on exoskeleton joints exceeds the material strength, some suggestions are then proposed on joint design.

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Sukhov, D. I., S. V. Nerush, I. Yu Efimochkin, F. N. Karachevchev i I. A. Bogachev. "PRODUCTION OF MMC BASED ON VZh159 ALLOY BY SELECTIVE LASER MELTING". Aviation Materials and Technologies, nr 2 (2021): 62–72. http://dx.doi.org/10.18577/2713-0193-2021-0-2-62-72.

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The paper considers manufacturing of metal matrix composites (MMC) by means of selective laser melting. The heat-resistant nickel-based Ni–Cr–Mo–Nb–Al alloy was chosen as a matrix material, the Y2O3 oxide was chosen as a strengthener. After mechanical alloying the obtained powder was used in SLM for the production of a material. The synthesized material’s condition was examined after the SLM process and after hot isostatic pressing (HIP). In the structure the areas containing Y, Al and O-based compounds were found. The creep-rupture tests of samples after HIP and heat treatment were performed and the results were explained by fractographic analysis.

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Pulkkinen, P., T. Jämsä, E. M. Lochmüller, V. Kuhn, M. Nieminen i F. Eckstein. "87 Prediction of Hip Fracture Load from Radiographs by Combined Analysis of Trabecular Bone Structure and Bone Geometry". Journal of Clinical Densitometry 12, nr 1 (styczeń 2009): 125. http://dx.doi.org/10.1016/j.jocd.2008.07.108.

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Takada, Junichi, Hiroshi Wada, Kousuke Iba, Kouichi Sasaki, Takayuki Dohke, Kumiko Kanaya, Takashi Yoshizaki i Toshihiko Yamashita. "Combined Use of Ibandronate and Eldecalcitol in Postmenopausal Japanese Women with Osteoporosis". Journal of Orthopaedic Surgery 24, nr 3 (grudzień 2016): 362–66. http://dx.doi.org/10.1177/1602400318.

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Purpose To evaluate the effect of combined use of ibandronate and eldecalcitol for 6 to 12 months on bone mineral density (BMD) and bone strength of the proximal femur in postmenopausal Japanese women with osteoporosis. Methods BMD and bone strength of the proximal femur were evaluated in 78 postmenopausal women (mean age, 73.6 years) who underwent treatment for osteoporosis with combined use of ibandronate and eldecalcitol for at least 6 months. BMD was measured at the lumbar spine, femoral neck, and total hip using dual-energy X-ray absorptiometry (DXA) at baseline and every 6 months thereafter. Hip structure analysis of the narrow neck and intertrochanter was performed by a radiologist using DXA images. Results Respectively for the lumbar spine, femoral neck, and total hip, BMD significantly increased (from baseline) by 4.54%, 2.31%, and 1.56% at 6 months and by 5.92%, 3.02%, and 2.70% at 12 months. In hip structure analysis, most parameters improved significantly. Respectively for the narrow neck and intertrochanter, BMD significantly increased (from baseline) by 2.37% and 2.71% at 6 months and by 3.46% and 3.52% at 12 months; cross-sectional area significantly increased by 1.83% and 3.39% at 6 months and by 2.91% and 3.46% at 12 months; section modulus significantly increased by 2.42% and 4.11% at 6 months and by 4.84% and 3.26% at 12 months; cortical thickness significantly increased by 2.49% and 3.33% at 6 months and by 3.73% and 3.37% at 12 months; and buckling ratio significantly decreased by 2.97% and 2.57% at 6 months and by 3.86% and 2.99% at 12 months. Conclusion Combined use of ibandronate and eldecalcitol for 6 months significantly improved bone strength of the proximal femur in postmenopausal Japanese women with osteoporosis.

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Moshtyleva, E. S. "Interaction of Narrative and Lyrical Principles in Texts of Contemporary Musical Performers". Nauchnyi dialog, nr 4 (21.04.2021): 112–28. http://dx.doi.org/10.24224/2227-1295-2021-4-112-128.

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A comprehensive linguistic study of the functional features of the linguistic and communicative-pragmatic organization of narrative in text materials posted on the Internet platform is presented. Particular attention is paid to how the interpenetration of the narrative and lyrical principles occurs within one work. The material for the research was the text of the hip-hop opera “Orpheus & Eurydice” posted on the re-source “Yandex.Music”. A complex technique of interpretation of narrative strategies based on the methods of functional-stylistic, communicative-pragmatic and lexical-semantic analysis was used. The question is raised about the peculiarities of the functioning of the lyric text within the narrative and about their relationship. The role played by the mythologization of the narrative text is shown in the article. The novelty of the research is seen in the fact that the author describes the relationship be-tween narrative and lyricism in the work. The question of establishing the determinants of hip-hop narrative is raised. The structure of a narrative text with elements of lyricism is considered. The results of the analysis of the peculiarities of the linguistic embodiment of the narrators and actants are presented. The author dwells on the communicative-functional structure of the studied text, describing the specific functions of the narrative with fragments of lyricism. A model for determining the leading type of cognitive modeling (narrative or lyrics) through the functional and linguopragmatic study of the hip-hop text is proposed.

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Jagatia, M., i Z. M. Jin. "Analysis of elastohydrodynamic lubrication in a novel metal-on-metal hip joint replacement". Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 216, nr 3 (1.03.2002): 185–93. http://dx.doi.org/10.1243/0954411021536397.

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Elastohydrodynamic lubrication (EHL) analysis was carried out in this study for a novel metal-on-metal hip prosthesis, which consists of a cobalt-chrome alloy femoral head articulating against a cobalt-chrome alloy acetabular insert connected to a titanium fixation shell through a taper. Finite element models were developed to investigate the effect of the pelvic bone and the load on the predicted contact pressure distribution between the two bearing surfaces under dry conditions. The finite element method was used to develop elasticity models for both the femoral and the acetabular components; it was found that the elastic deformation of the acetabular insert was mainly dependent on the load, rather than the detailed pressure distribution. A modified solution methodology was accordingly developed to couple the elasticity models for both the femoral and the acetabular surfaces with the Reynolds equation and to solve these numerically by the finite difference method. It was found that a load increase from 500 to 2500 N had a negligible effect on the predicted maximum contact pressure and the minimum film thickness, due to the relatively flexible and accommodating structure of the acetabular insert. Furthermore, the predicted minimum film thickness was shown to be significantly greater than the simple estimation based on the assumption of semi-infinite solids (mono-block design) using the Hamrock and Dowson formula. The effects of the viscosity of the lubricant and the radial clearance between the femoral and the acetabular components on the predicted lubricating film thickness were investigated under both in vitro simulator testing and in vivo walking conditions.

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