Выбор способа хирургического лечения детей грудного и преддошкольного возраста с вывихом бедра при амиоплазии

Background. Patients with amyoplasia-type arthrogryposis and hip dislocation have different variants of hip contractures and deformities, but there is no difference in the selection of the type of surgery. The study aimed to justify and evaluate the effectiveness of the original algorithm of the rational selection of surgical approaches in children aged 3 years with hip dislocation in amyoplasia. Material and Methods. Level of evidence II. Seventy patients were examined, including 21 children aged 1 year (main group) who underwent 25 hip open reductions; 19 children aged 1.53 years (main group) who underwent hip open reductions, Salter innominate osteotomy, and femoral osteotomy; and 30 patients aged 37 years (control group) who had not previously received conservative and surgical treatment. All patients were divided into two subgroups depending on the variant of hip contracture: flexionextensionabductionexternal rotation (frog-like) (subgroup 1) and flexionextensionadductionexternal rotation (subgroup 2). Clinical, radiological, and statistical methods were used. Results. In subgroup 1, after hip open reduction, good results were noted in 17% of cases, satisfactory in 50%, and unsatisfactory in 33%. Severe complications, i.e., classes III and IV according to the modified ClavienDindoSink classification, were noted in 83% of the cases. After hip open reduction, Salter innominate osteotomy, and femoral osteotomy in subgroup 1, good results were noted in 50% of cases and satisfactory and unsatisfactory each in 25%, and 50% had less severe complications (p = 0.041). In subgroup 2, after hip open reduction, good results were obtained in 90% of cases and satisfactory in 10%, and 10% had severe complications When this surgery was combined with Salter innominate osteotomy and femoral osteotomy, good results were noted in 75% of cases, satisfactory in 19%, and unsatisfactory in 6%, and 25% had severe complications (p = 0.05). Conclusion. A differentiated treatment approach of children with hip dislocation in amyoplasia-type arthrogryposis will increase the effectiveness of treatment methods, and its introduction into clinical practice will help to improve outcomes.Актуальность. У пациентов с вывихом бедра при амиоплазии встречаются различные варианты контрактур тазобедренных суставов и характерные для каждого из них деформации сустава, однако отсутствуют различия в выборе способа лечения. Цель исследования обосновать и оценить эффективность оригинального алгоритма выбора способа хирургического лечения детей до 3 лет с вывихом бедра при амиоплазии. Материал и методы. Обследовано 70 больных. Основную группу составили 40 детей, из них 21 ребенку в возрасте до 1 года было выполнено 25 операций открытого вправления бедра, у 19 детей в возрасте с 1,5 до 3 лет открытое вправление дополнялось подвздошной остеотомией по Солтеру, корригирующей остеотомией бедренной кости. В контрольную группу вошли 30 пациентов в возрасте от 3 до 7 лет, ранее не получавшие консервативного и хирургического лечения. Пациенты основной и контрольной групп были разделены на подгруппы в зависимости от варианта контрактуры тазобедренного сустава: отводящая (первые подгруппы) и приводящая (вторые подгруппы). Использовалась оригинальная шкала оценки функции ТБС, основанная на измерении пассивных движений по отношению к функциональному диапазону движений, необходимому для выполнения повседневных действий. Для оценки результатов лучевых методов исследования применялась предложенная авторами шкала рентгенологической оценки ТБС. Результаты. У детей первой подгруппы после открытого вправления бедра хорошие результаты отмечены в 17% случаев, удовлетворительные в 50%, неудовлетворительные в 33% с развитием осложнений III и IV классов по модифицированной классификации Clavien Dindo Sink в 83% наблюдений. После открытого вправления бедра, подвздошной остеотомии по Солтеру, корригирующей остеотомии бедренной кости, выполненных пациентам первой подгруппы, хорошие результаты отмечены в 50% случаев, удовлетворительные и неудовлетворительные по 25% при меньшем количестве тяжелых осложнений (50%) (р = 0,041). У детей второй подгруппы после открытого вправления бедра хорошие результаты получены в 90% случаев, удовлетворительные в 10% при частоте тяжелых осложнений 10%, а при сочетании данной операции с подвздошной остеотомией по Солтеру, корригирующей остеотомией бедренной кости хорошие результаты отмечены в 75% наблюдений, удовлетворительные в 19% и неудовлетворительные в 6% при частоте тяжелых осложнений 25% (р = 0,05). Заключение. Дифференцированный подход к лечению детей с данной патологией позволит повысить эффективность оперативных вмешательств, а его внедрение в клиническую практику будет способствовать улучшению исходов лечения

Surprises in the Orbital Magnetic Moment and g-Factor of the Dynamic Jahn-Teller Ion C_{60}^-

We calculate the magnetic susceptibility and g-factor of the isolated C_{60}^- ion at zero temperature, with a proper treatment of the dynamical Jahn-Teller effect, and of the associated orbital angular momentum, Ham-reduced gyromagnetic ratio, and molecular spin-orbit coupling. A number of surprises emerge. First, the predicted molecular spin-orbit splitting is two orders of magnitude smaller than in the bare carbon atom, due to the large radius of curvature of the molecule. Second, this reduced spin-orbit splitting is comparable to Zeeman energies, for instance, in X-band EPR at 3.39KGauss, and a field dependence of the g-factor is predicted. Third, the orbital gyromagnetic factor is strongly reduced by vibron coupling, and so therefore are the effective weak-field g-factors of all low-lying states. In particular, the ground-state doublet of C_{60}^- is predicted to show a negative g-factor of \sim -0.1.Comment: 19 pages RevTex, 2 postscript figures include

Search for leptophobic Z ' bosons decaying into four-lepton final states in proton-proton collisions at root s=8 TeV

Peer reviewe

Search for black holes and other new phenomena in high-multiplicity final states in proton-proton collisions at root s=13 TeV

Peer reviewe

Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks

Peer reviewe

Search for the associated production of the Higgs boson with a top-quark pair

A search for the standard model Higgs boson produced in association with a top-quark pair t t ¯ H (tt¯H) is presented, using data samples corresponding to integrated luminosities of up to 5.1 fb −1 and 19.7 fb −1 collected in pp collisions at center-of-mass energies of 7 TeV and 8 TeV respectively. The search is based on the following signatures of the Higgs boson decay: H → hadrons, H → photons, and H → leptons. The results are characterized by an observed t t ¯ H tt¯H signal strength relative to the standard model cross section, μ = σ/σ SM ,under the assumption that the Higgs boson decays as expected in the standard model. The best fit value is μ = 2.8 ± 1.0 for a Higgs boson mass of 125.6 GeV

Search for neutral resonances decaying into a Z boson and a pair of b jets or τ leptons

A search is performed for a new resonance decaying into a lighter resonance and a Z boson. Two channels are studied, targeting the decay of the lighter resonance into either a pair of oppositely charged τ leptons or a bb‾ pair. The Z boson is identified via its decays to electrons or muons. The search exploits data collected by the CMS experiment at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.8 fb −1 . No significant deviations are observed from the standard model expectation and limits are set on production cross sections and parameters of two-Higgs-doublet models

Phenomenological MSSM interpretation of CMS searches in pp collisions at √s=7 and 8 TeV

Searches for new physics by the CMS collaboration are interpreted in the framework of the phenomenological minimal supersymmetric standard model (pMSSM). The data samples used in this study were collected at root s = 7 and 8 TeV and have integrated luminosities of 5.0 fb(-1) and 19.5 fb(-1), respectively. A global Bayesian analysis is performed, incorporating results from a broad range of CMS supersymmetry searches, as well as constraints from other experiments. Because the pMSSM incorporates several well-motivated assumptions that reduce the 120 parameters of the MSSM to just 19 parameters defined at the electroweak scale, it is possible to assess the results of the study in a relatively straightforward way. Approximately half of the model points in a potentially accessible subspace of the pMSSM are excluded, including all pMSSM model points with a gluino mass below 500 GeV, as well as models with a squark mass less than 300 GeV. Models with chargino and neutralino masses below 200 GeV are disfavored, but no mass range of model points can be ruled out based on the analyses considered. The nonexcluded regions in the pMSSM parameter space are characterized in terms of physical processes and key observables, and implications for future searches are discussed

Search for single production of a heavy vector-like T quark decaying to a Higgs boson and a top quark with a lepton and jets in the final state

A search for single production of vector-like top quark partners (T) decaying into a Higgs boson and a top quark is performed using data from pp collisions at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 2.3 fb−1. The top quark decay includes an electron or a muon while the Higgs boson decays into a pair of b quarks. No significant excess over standard model backgrounds is observed. Exclusion limits on the product of the production cross section and the branching fraction are derived in the T quark mass range 700 to 1800 GeV. For a mass of 1000 GeV, values of the product of the production cross section and the branching fraction greater than 0.8 and 0.7 pb are excluded at 95% confidence level, assuming left- and right-handed coupling of the T quark to standard model particles, respectively. This is the first analysis setting exclusion limits on the cross section of singly produced vector-like T quarks at a centre-of-mass energy of 13 TeV

Search for lepton flavour violating decays of heavy resonances and quantum black holes to an eμ pair in proton–proton collisions at √s = 8 TeV

A search for narrow resonances decaying to an electron and a muon is presented. The eμ mass spectrum is also investigated for non-resonant contributions from the production of quantum black holes (QBHs). The analysis is performed using data corresponding to an integrated luminosity of 19.7 fb-1 collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. With no evidence for physics beyond the standard model in the invariant mass spectrum of selected eμ pairs, upper limits are set at 95 % confidence level on the product of cross section and branching fraction for signals arising in theories with charged lepton flavour violation. In the search for narrow resonances, the resonant production of τ sneutrino in R-parity violating supersymmetry is considered. The τ sneutrino is excluded for masses below 1.28 TeV for couplings λ132= λ231= λ311′= 0.01 , and below 2.30 TeV for λ132= λ231= 0.07 and λ311′= 0.11. These are the most stringent limits to date from direct searches at high-energy colliders. In addition, the resonance searches are interpreted in terms of a model with heavy partners of the Z boson and the photon. In a framework of TeV-scale quantum gravity based on a renormalization of Newton’s constant, the search for non-resonant contributions to the eμ mass spectrum excludes QBH production below a threshold mass Mth of 1.99 TeV. In models that invoke extra dimensions, the bounds range from 2.36 TeV for one extra dimension to 3.63 TeV for six extra dimensions. This is the first search for QBHs decaying into the eμ final state