The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Yukihide Iwamoto - One of the best experts on this subject based on the ideXlab platform.
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Internal Rotation of femoral component affects functional activities after tka survey with the 2011 knee society score
Journal of Arthroplasty, 2014Co-Authors: Shinya Kawahara, Shigetoshi Okamoto, Hiroyuki Nakahara, Ken Okazaki, Shuichi Matsuda, Yukihide IwamotoAbstract:Abstract The 2011 Knee Society Knee Scoring System (KSS) was developed as a new patient-derived outcome measure to better characterize satisfaction, expectations, and physical activities after total knee arthroplasty. The Rotational alignment of the femoral and tibial components was assessed with computed tomography in 75 patients (92 knees), and its effect on the scores of the KSS was evaluated. Internal Rotation of the femoral component relative to the surgical epicondylar axis significantly decreased the score of functional activities and slightly decreased the score of satisfaction. Femoral component malRotation did not affect the scores of symptoms and expectations. Tibial component malRotation did not affect any of the scores of the 2011 KSS. Surgeons should avoid Internal Rotation of the femoral component to preserve functional activities.
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relationship between the maximum flexion Internal Rotation test and the torn acetabular labrum of a dysplastic hip
Journal of Orthopaedic Science, 2002Co-Authors: Eiji Suenaga, Yasuo Noguchi, Seiya Jingushi, Toshihide Shuto, Yasuharu Nakashima, Keita Miyanishi, Yukihide IwamotoAbstract:To determine the relationship between pain at flexion-Rotation and the status of a labral tear in patients with dysplastic hips, physical examination maneuvers and hip arthroscopy were carried out in 59 patients with dysplastic osteoarthritis (5 men and 54 women; mean age, 41 years; range, 16 to 64 years). Between January 1998 and June 2000, these patients underwent 60 hip arthroscopies at Kyushu University Hospital. All hip joints arthroscoped demonstrated incomplete or complete detaching tears of the acetabular labrum in one portion of the weight-bearing area. Twenty-three patients (39%) experienced pain during the maximum flexion-Internal Rotation test; 16 patients (27%) showed a positive result for the maximum flexion-external Rotation test. There was no statistically significant relationship between the results of the maximum flexion-external Rotation test and the arthroscopic findings of labral tears. A positive maximum flexion-Internal Rotation test result, however, correlated well with incomplete detaching tears in the posterosuperior portion of the acetabular labrum. In contrast, a complete detaching tear of the posterosuperior labrum was associated with a negative maximum flexion-Internal Rotation test result. The maximum flexion-Internal Rotation test is useful for assessing the magnitude of a labral tear in the posterosuperior portion of the acetabular labrum in dysplastic hips.
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original articlesrelationship between the maximum flexion Internal Rotation test and the torn acetabular labrum of a dysplastic hip
Journal of Orthopaedic Science, 2002Co-Authors: Eiji Suenaga, Yasuo Noguchi, Seiya Jingushi, Toshihide Shuto, Yasuharu Nakashima, Keita Miyanishi, Yukihide IwamotoAbstract:To determine the relationship between pain at flexion-Rotation and the status of a labral tear in patients with dysplastic hips, physical examination maneuvers and hip arthroscopy were carried out in 59 patients with dysplastic osteoarthritis (5 men and 54 women; mean age, 41 years; range, 16 to 64 years). Between January 1998 and June 2000, these patients underwent 60 hip arthroscopies at Kyushu University Hospital. All hip joints arthroscoped demonstrated incomplete or complete detaching tears of the acetabular labrum in one portion of the weight-bearing area. Twenty-three patients (39%) experienced pain during the maximum flexionInternal Rotation test; 16 patients (27%) showed a positive result for the maximum flexion-external Rotation test. There was no statistically significant relationship between the results of the maximum flexion-external Rotation test and the arthroscopic findings of labral tears. A positive maximum flexion-Internal Rotation test result, however, correlated well with incomplete detaching tears in the posterosuperior portion of the acetabular labrum. In contrast, a complete detaching tear of the posterosuperior labrum was associated with a negative maximum flexion-Internal Rotation test result. The maximum flexion-Internal Rotation test is useful for assessing the magnitude of a labral tear in the posterosuperior portion of the acetabular labrum in dysplastic hips.
Michael T Hirschmann - One of the best experts on this subject based on the ideXlab platform.
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tibial Internal Rotation negatively affects clinical outcomes in total knee arthroplasty a systematic review
Knee Surgery Sports Traumatology Arthroscopy, 2018Co-Authors: Alfredo Schiavone Panni, Francesco Ascione, Marco Rossini, Adriano Braile, Katia Corona, Michele Vasso, Michael T HirschmannAbstract:The aim of this systematic review is to analyze the effect of tibial Rotational alignment after total knee arthroplasty (TKA) on clinical outcomes and assess the eventual cut-off values for tibial TKA Rotation leading to poor outcomes. A detailed and systematic search from 1997 to 2017 of the Pubmed, Medline, Cochrane Reviews, and the Google Scholar databases was performed using the keyword terms “total knee arthroplasty”, “total knee replacement”, “tibial alignment”, “tibial malalignement”, “tibial Rotation”, “Rotational error”, “axis”, “angle”, “tibial malRotation”, “clinical outcome”, in several combinations. The modified Coleman scoring methodology (mCMS) was used. All the primary TKAs studies analyzing correlation between clinical results and tibial Rotation were included. Five articles met the inclusion criteria. A total of 333 arthroplasties were included in this review; 139 had tibial component malalignment, while 194 were in control groups. The mean age of patients was 67.3 (SD 0.57) years. The mean average postoperative follow-up delay was 34.7 months (range 21–70). The mean mCMS score was 59.2 points indicating good methodological quality in the included studies. Functional outcomes were assessed through KSS, OKS, KOOS and VAS, negatively related to tibial Internal Rotation. Our review confirmed that excessive Internal Rotation of the tibial TKA component represents a significant risk factor for pain and inferior functional outcomes after TKA (> 10° of Internal Rotation demonstrated the common value), since external Rotation does not affect the results. However, a universal precise cut-off value has not been found in the available literature and there remains a debate about CT Rotation assessment and surgical intra-operative landmarks. III.
Kensuke Ochi - One of the best experts on this subject based on the ideXlab platform.
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shoulder Internal Rotation elbow flexion test for diagnosing cubital tunnel syndrome
Journal of Shoulder and Elbow Surgery, 2012Co-Authors: Kensuke Ochi, Aya Tanabe, Yasuhito Kaneko, Makoto Waseda, Yukio Horiuchi, Takahiro KoyanagiAbstract:Background Shoulder Internal Rotation enhances symptom provocation attributed to cubital tunnel syndrome. We present a modified elbow flexion test—the shoulder Internal Rotation elbow flexion test—for diagnosing cubital tunnel syndrome. Methods Fifty-five ulnar nerves in cubital tunnel syndrome patients and 123 ulnar nerves in controls were examined with 5 seconds each of elbow flexion, shoulder Internal Rotation, and shoulder Internal Rotation elbow flexion tests before and after treatment (surgery in 18; conservative in others). For the shoulder Internal Rotation elbow flexion test position, 90° abduction, maximum Internal Rotation, and 10° flexion of the shoulder were combined with the elbow flexion test position. The test was considered positive if any symptom for cubital tunnel syndrome developed Results The sensitivities/specificities of the 5-second elbow flexion, shoulder Internal Rotation, and shoulder Internal Rotation elbow flexion tests were 25%/100%, 58%/100%, and 87%/98%, respectively. Sensitivity differences between the shoulder Internal Rotation elbow flexion test and the other two tests were significant. Shoulder Internal Rotation elbow flexion test results and cubital tunnel syndrome symptoms were significantly correlated. Influence of the shoulder Internal Rotation elbow flexion test on the ulnar nerve was seen in 8 of 10 cubital tunnel syndrome nerves but not in controls. Conclusions The 5-second shoulder Internal Rotation elbow flexion test is specific, easy and quick provocative test for diagnosing cubital tunnel syndrome.
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comparison of shoulder Internal Rotation test with the elbow flexion test in the diagnosis of cubital tunnel syndrome
Journal of Hand Surgery (European Volume), 2011Co-Authors: Kensuke Ochi, Aya Tanabe, Kozo Morita, Yukio Horiuchi, Kentaro Takeda, Ken NinomiyaAbstract:Purpose To compare the shoulder Internal Rotation test—a new, provocative test—with the elbow flexion test in the diagnosis of cubital tunnel syndrome (CubTS). Methods Twenty-five patients with CubTS were examined before and after surgery with 10 seconds each of the elbow flexion and shoulder Internal Rotation tests. Fifty-four asymptomatic individuals and 14 neuropathy patients with a diagnosis other than CubTS were also examined as control cases. For the shoulder Internal Rotation test, the patient's upper extremity was kept at 90° abduction, maximum Internal Rotation, and 10° flexion at the shoulder, with 90° elbow flexion and neutral position of the forearm and wrist, with finger extension. Test results were considered positive if any slight symptom attributable to CubTS occurred within 10 seconds. Extraneural pressure inside the cubital tunnel was intraoperatively measured with the positions of both the elbow flexion and shoulder Internal Rotation tests, in 15 of the CubTS cases. Statistical analyses were performed using Student's t -test with a confidence level of 95%. Results The preoperative sensitivity in CubTS cases was 80% in the 10-second shoulder Internal Rotation test and 36% in the 10-second elbow flexion test, and these differences were significant. None of the control cases had positive results in either test. All the CubTS cases improved with surgery; after surgery, neither test provoked symptoms in any surgical patient. The extraneural pressure increased in both provocative positions with no significant difference. Conclusions Positive results for the 10-second shoulder Internal Rotation test were more sensitive than that for the elbow flexion test of the same duration and seemed specific to CubTS. Type of study/level of evidence Diagnostic III.
Ha Vinh Lam Nguyen - One of the best experts on this subject based on the ideXlab platform.
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laboratory Rotational spectroscopy of methyl n propyl sulfide conformational analysis and methyl Internal Rotation
Journal of Molecular Spectroscopy, 2020Co-Authors: Layla Tulimat, Halima Mouhib, Ha Vinh Lam Nguyen, Wolfgang StahlAbstract:Abstract The microwave spectrum of methyl n-propyl sulfide, CH3-S-CH2-CH2-CH3, was recorded in the frequency region from 2.0 to 26.5 GHz, revealing three conformers. Quantum chemical calculations were carried out to support the experimental work. Fine splittings arising from the Internal Rotation of the methyl group attached to the sulfur atom were resolved and analyzed. Torsional barriers of about 600 cm−1 for the two conformers with C1 symmetry and about 700 cm−1 for the Cs conformer could be deduced, showing that the conformations affect the methyl Internal Rotation. Torsional splittings of the methyl group at the end of the propyl moiety were observed for some transitions, leading to the determination of barrier heights close to 1000 cm−1. The spectrum of the 34S isotopologue of the most stable conformer could be measured in natural abundance. The present laboratory work provides highly accurate spectroscopic parameters, which serve as reliable starting values for extrapolation in higher frequency ranges and for the search of this sulfur-containing molecule in the interstellar medium.
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the microwave spectrum of 2 methylthiazole 14n nuclear quadrupole coupling and methyl Internal Rotation
Journal of Chemical Physics, 2020Co-Authors: Thuy Nguyen, Wolfgang Stahl, Claudine Gutle, Martin Schwell, I Kleiner, Ha Vinh Lam NguyenAbstract:: The Rotational spectrum of 2-methylthiazole was recorded using two pulsed molecular jet Fourier transform microwave spectrometers operating in the frequency range of 2-40 GHz. Due to the Internal Rotation of the methyl group, all Rotational transitions were split into A and E symmetry species lines, which were analyzed using the programs XIAM and BELGI-Cs-hyperfine, yielding a methyl torsional barrier of 34.796 75(18) cm-1. This value was compared with that found in other monomethyl substituted aromatic five-membered rings. The 14N quadrupole coupling constants were accurately determined to be χaa = 0.5166(20) MHz, χbb - χcc = -5.2968(50) MHz, and χab = -2.297(10) MHz by fitting 531 hyperfine components. The experimental results were supplemented by quantum chemical calculations.
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communication through the furan ring the conformational effect on the Internal Rotation of 5 methyl furfural studied by microwave spectroscopy
Physical Chemistry Chemical Physics, 2018Co-Authors: Rihab Hakiri, Ha Vinh Lam Nguyen, Najoua Derbel, Halima MouhibAbstract:Internal Rotation is a fundamental motion of methyl groups that provides important insights into the molecular physics of isolated molecules. The barrier heights of such large amplitude motions are highly sensitive to their molecular and electronic environment. To date, it is still not possible to accurately determine these values using quantum chemical calculations. To probe the effect of molecular conformations on the barrier heights of substituted furan rings, the molecular jet Fourier transform microwave spectrum of 5-methyl furfural was recorded in the frequency range from 2.0 to 40.0 GHz. Quantum chemical calculations yielded two conformers with a trans and a cis orientation of the formyl group, which were both observed in the experimental spectrum. Torsional splittings due to the Internal Rotation of the methyl group were resolved and analyzed. The experimental spectrum is reproduced with standard deviations close to the experimental accuracy, yielding sets of highly accurate Rotational and Internal Rotation parameters. The results, especially the V3 potentials, are compared to quantum chemical calculations and discussed within the scope of the current literature of other methyl substituted furans, where the methyl group is in close proximity of the furan oxygen atom. The present work provides an accurate evaluation of the different case studies and highlights the bottlenecks and future options of the currently available theoretical techniques.
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the effects of nitrogen inversion tunneling methyl Internal Rotation and 14n quadrupole coupling observed in the Rotational spectrum of diethyl amine
Journal of Chemical Physics, 2011Co-Authors: Ha Vinh Lam Nguyen, Wolfgang StahlAbstract:The Rotational spectrum of diethyl amine as observed by molecular beam Fourier transform microwave spectroscopy shows splittings due to nitrogen inversion, 14N quadrupole coupling, and Internal Rotation of the methyl groups. The Rotational constants of diethyl amine were determined to be A = 17.61499170(11) GHz, B = 2.103650248(49) GHz, and C = 1.981332501(47) GHz. From the separation between the lowest symmetric and antisymmetric inversion energy level of E = 760.77062(20) MHz a barrier to inversion, using a standard analytical model potential, of 1531 cm−1 (18.31 kJ/mol) was deduced. The 14N quadrupole coupling constants were found to be χaa = 2.67576(37) MHz, χbb − χcc = 4.34144(65) MHz, and |χbc| = 2.9199(92) MHz. The Internal Rotation of two equivalent methyl groups gave rise to very narrow multiplets; the torsional barrier was determined to be 1051.74(57) cm−1. The experimental results were supplemented by quantum chemical calculations.
J Christensendalsgaard - One of the best experts on this subject based on the ideXlab platform.
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the Internal Rotation profile of the b type star kic 10526294 from frequency inversion of its dipole gravity modes
The Astrophysical Journal, 2015Co-Authors: S A Triana, Ehsan Moravveji, P I Papics, C Aerts, S D Kawaler, J ChristensendalsgaardAbstract:The Internal angular momentum distribution of a star is the key to determining its evolution. Fortunately, stellar Internal Rotation can be probed through studies of Rotationally split nonradial oscillation modes. In particular, the detection of nonradial gravity modes (g modes) in massive young stars has recently become feasible thanks to the Kepler space mission. Our goal is to derive the Internal Rotation profile of the Kepler B8V star KIC 10526294 through asteroseismology. We interpret the observed Rotational splittings of its dipole g modes using four different approaches based on the best seismic models of the star and their Rotational kernels. We show that these kernels can resolve differential Rotation within the radiative envelope if a smooth Rotational profile is assumed and if the observational errors are small. Based on Kepler data, we find that the Rotation rate near the core-envelope boundary is well constrained to 163 ± 89 nHz. The seismic data are consistent with rigid Rotation but a profile with counter-Rotation within the envelope has a statistical advantage over constant Rotation. Our study should be repeated for other massive stars with a variety of stellar parameters in order to determine the physical conditions that control the Internal Rotation profile of young massive stars, with the aim of improving the input physics of their models.
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the Internal Rotation profile of the b type star kic10526294 from frequency inversion of its dipole gravity modes and statistical model comparison
arXiv: Solar and Stellar Astrophysics, 2015Co-Authors: S A Triana, Ehsan Moravveji, P I Papics, C Aerts, S D Kawaler, J ChristensendalsgaardAbstract:The Internal angular momentum distribution of a star is key to determine its evolution. Fortunately, the stellar Internal Rotation can be probed through studies of Rotationally-split non-radial oscillation modes. In particular, detection of non-radial gravity modes (g modes) in massive young stars has become feasible recently thanks to the Kepler space mission. Our aim is to derive the Internal Rotation profile of the Kepler B8V star KIC 10526294 through asteroseismology. We interpret the observed Rotational splittings of its dipole g modes using four different approaches based on the best seismic models of the star and their Rotational kernels. We show that these kernels can resolve differential Rotation the radiative envelope if a smooth Rotational profile is assumed and the observational errors are small. Based on Kepler data, we find that the Rotation rate near the core-envelope boundary is well constrained to $163\pm89$ nHz. The seismic data are consistent with rigid Rotation but a profile with counter-Rotation within the envelope has a statistical advantage over constant Rotation. Our study should be repeated for other massive stars with a variety of stellar parameters in order to deduce the physical conditions that determine the Internal Rotation profile of young massive stars, with the aim to improve the input physics of their models.
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the Internal Rotation of the sun
Annual Review of Astronomy and Astrophysics, 2003Co-Authors: M J Thompson, J Christensendalsgaard, Mark S Miesch, Juri ToomreAbstract:▪ Abstract Helioseismology has transformed our knowledge of the Sun's Rotation. Earlier studies revealed the Sun's surface Rotation, but now a detailed observational picture has been built up of the Internal Rotation of our nearest star. Unlike the predictions of stellar-evolution models, the radiative interior is found to rotate roughly uniformly. The Rotation within the convection zone is also very different from prior expectations, which had been that the Rotation rate would depend primarily on the distance from the Rotation axis. Layers of Rotational shear have been discovered at the base of the convection zone and in the subphotospheric layers. Studies of the time variation of Rotation have uncovered zonal-flow bands, extending through a substantial fraction of the convection zone, which migrate over the course of the solar cycle, and there are hints of other temporal variations and of a jet-like structure. At the same time, building on earlier work with mean-field models, researchers have made great...
