Artroplastia "De la Caffinière" en pacientes afectos de artrosis trapecio-metacarpiana: seguimiento a 15 años

Presentamos un estudio descriptivo retrospectivo de 13 pacientes afectos de artrosis-trapecio metacarpiana intervenidos con artroplastia De la Caffinière en el departamento de Cirugía Ortopédica y Traumatología de la Clínica Universitaria de Navarra con un seguimiento medio de 14,2 años. La edad media de los pacientes fue de 56 años (rango 30 a 76 años). En 12 casos fueron mujeres y en una ocasión un varón. Los resultados funcionales son excelentes. Las complicaciones observadas durante el seguimiento ha sido el aflojamiento del componente trapecial (15-25%). La artroplastia De la Caffinière como tratamiento de la artrosis trapecio-metacarpiana muestra resultados excelentes en pacientes de 60 años con baja demanda funcional y un estadio III de Eaton en la articulación trapeciometacarpiana. Las movilizaciones asépticas observada en nuestro estudio son asintomáticas y no requirieron tratamiento médico o quirúrgico siendo bien tolerada por los pacientes.We report a descriptive retrospective study of 13 De la Caffinière trapezium-metacarpal cemented protheses implanted for painful TMC arthrosis in the Department of Orthopedics of the University Clinic of Navarra with an average follow-up of 14,2 years. The middle ages of the patients were 56 years old (range 30 to 76 years). In 12 cases they were women and in one case a male. The functional results are excellent. The complications observed during the follow-up has been the loosening of the trapezium component (15-25 %). De la Caffinière arthroplasty as treatment of the degenerative TMC arthrosis shows excellent results in 60-year-old patients with low functional demand and a stadium III of Eaton. The aseptic mobilization observed in our study are asymtomatic and they did not need medical or surgical treatment being well tolerated by the patients

Compact forms of reduced density matrices

10 págs.; 3 tabs.; PACS number~s!: 31.15.Hz, 31.10.1zThe necessary and sufficient minimum information carried by reduced density matrices (RDM) are discussed. A method is reported for obtaining the same information as a p-RDM although in compact form, from which all the redundant information is omitted. The algebra operations and basic properties of these compact-form matrices are obtained. ©2003 The American Physical SocietyWe are greatly indebted to the Spanish Ministerio de Educación, Cultura y Deporte for its support under Project No. BQU2000-1158Peer Reviewe

Implicaciones del hiperparatiroidismo primario en cirugía ortopédica y traumatología: presentación de dos casos y revisión de la bibliografía

El hiperparatiroidismo primario es una patología en relación con el metabolismo del calcio con el resultado de niveles de calcio séricos elevados y un incremento en el nivel de hormona paratifoidea (PTH). Los pacientes suelen encontrarse asintomáticos al diagnóstico, basándose en un diagnóstico bioquímico, al observarse un nivel de calcio sérico elevado. Los avances en imagen, mediciones de hormona paratiroidea y la técnica quirúrgica permite un abordaje sin necesidad de la exploración de las cuatro glándulas paratiroideas. El objetivo de nuestro trabajo es realizar una revisión retrospectiva de pacientes afectos de hiperparatiroidismo primario en nuestro centro y mostrar su implicación en cirugía ortopédica y traumatología.Primary hyperparathyroidism is a generalized disorder of calcium metabolism resulting from abnormally high levels of serum calcium and an increased level of parathyroid hormone (PTH). Are most often diagnosed when routine biochemical testing shows an elevated serum calcium levels. Advances in imaging technology, intraoperative parathyroid hormone measurement, and surgical technique now allow parathyroidectomy to be performed using a focused approach without the absolute need of a four-gland exploration. We have done a retrospective revision of patients with hyperparathyroidism and his implication in orthopaedics surgery

Desarrollo y validación de una versión preliminar de la escala de competencia emocional en el deporte (ECE_D)

El importante papel que juegan las emociones en los contextos deportivos ha sido ampliamente defendido en la literatura sobre psicología del deporte. El objetivo de este estudio es desarrollar y validar un instrumento para evaluar la competencia emocional de los deportistas. La muestra la componen 367 deportistas de ambos géneros pertenecientes a diferentes disciplinas deportivas. Se analizaron los antecedentes y las características psicométricas de la Escala de Desarrollo Emocional (Schutte, Malouff, Hall, Haggerty, Cooper, Golden y Dornhein, 1998). Los resultados obtenidos confirmaron en términos generales el modelo de cuatro factores propuesto por los autores originales y además, plantea la posibilidad de incluir mejoras sustanciales del cuestionario para futuras versiones relacionadas con su aplicabilidad.The relevant role of emotions in competitive contexts has been widely supported in the sport psychology literature. The aim of this study was to create a valid measure of emotional development in sports. The sample is composed by 367 sportsmen/women belonging to different sporting disciplines. Analyses were performed about the antecedents and the psychometric properties of the Emotional Development Scale (Schutte, Malouff, Hall, Haggerty, Cooper, Golden & Dornhein, 1998). Results showed that, in general terms, the initially proposed four factor model was supported. Implications for considering the improvement of the applicability questionnaire are advance

Fracturas de antebrazo: resultado funcional tras reducción abierta y osteosíntesis

Hemos realizado una revisión retrospectiva de pacientes intervenidos por fracturas de antebrazo, recogiendo el resultado funcional (Grace-Eversmann). También hemos analizado la deformidad radial residual mediante el cálculo curvatura mayor del radio (CMR). Se cálculo el coeficiente de correlación de Pearson entre la CMR y el resultado funcional. Los resultados de 20 pacientes intervenidos entre 1972 y 2005. El tratamiento quirúrgico fue de reducción abierta y fijación interna (RAFI) en el 70%. El resultado funcional fue de excelente el 50% y malo en el 20%. La curvatura mayor del radio oscilaba entre 5 mm - 20 mm. No hemos observado correlación entre las variables estudiadas. No hemos observado correlación anatómico-funcional en los pacientes tratados quirúrgicamente por fractura de cubito y radio.Retrospective review of clinical notes. Data regarding to the surgical treatments. Functional outcomes (Grace-Eversmann). Residual radius deformity was analyzed measuring the radius curvature. Pearson's correlation coefficient was measured between radius curvature and functional outcome. Data of 20 patients attended between 1972 and 2005 are reviewed. Surgical treatment was open reduction and internal fíxation in 70% patients. The outcome was excellent in 50 % and poor in 20%. La major curve of the radius was between 5mm -20 mm. We haven't seen correlation in the variables studied. We haven't seen between the curvature of the radius and functional outcome any correlation in patients treated surgically of ulna and radius fractures

Pressure effects on the magnetic properties of FeCuZr studied by x-ray magnetic circular dichroism: Evidence of weakening of ferromagnetism in FeCuZr alloys

The room temperature changes of the magnetic behavior under pressure of an invar alloy of nominal composition [Fe_(0.5)Cu_(0.5)]_(87)Zr_(13) (at. %) has been studied by K-edge x-ray magnetic circular dichroism (XMCD) and x-ray absorption near edge spectroscopy (XANES). The Curie temperature, as determined from low field magnetization measurements, is (255 ± 15) K. However XMCD shows a non negligible signal above this temperature. In addition, the XMCD signal decreases upon increasing pressure indicating a pressure-induced collapse of the magnetic moment. These results evidence the itinerant character of FeCuZr alloys as well as the occurrence of magnetovolume effects characterized by a strong dependence of the 3d band on the Fe-Fe nearest neighbor distances

Toward a taxonomy of newspaper information quality: An experimental model and test applied to Venezuela dimensions found in information quality

The quality of information from communication media is a topic that has been dealt with by various theorists through the analysis of the final products of information. This research work offers an analysis model of the quality of information of printed news media by the use of three indexes of categories and structured dimensions that will allow for the assessment and evaluation of the quality of information from the media, and the identification of the incidence of political-economic conditions of the journalistic environment’s macro-environment. For this, an experimental test of two Venezuelan media outlets was performed. Their use allowed us to conclude that political polarization and discourse of social confrontation, as well as economic factors such as inflation and pay scales had a proportionally direct effect on the quality of information products

The Phonon Drag Effect in Single-Walled Carbon Nanotubes

A variational solution of the coupled electron-phonon Boltzmann equations is used to calculate the phonon drag contribution to the thermopower in a 1-D system. A simple formula is derived for the temperature dependence of the phonon drag in metallic, single-walled carbon nanotubes. Scattering between different electronic bands yields nonzero values for the phonon drag as the Fermi level varies.Comment: 8 pages, 4 figure

Polaron formation for a non-local electron-phonon coupling: A variational wave-function study

We introduce a variational wave-function to study the polaron formation when the electronic transfer integral depends on the relative displacement between nearest-neighbor sites giving rise to a non-local electron-phonon coupling with optical phonon modes. We analyze the ground state properties such as the energy, the electron-lattice correlation function, the phonon number and the spectral weight. Variational results are found in good agreement with analytic weak-coupling perturbative calculations and exact numerical diagonalization of small clusters. We determine the polaronic phase diagram and we find that the tendency towards strong localization is hindered from the pathological sign change of the effective next-nearest-neighbor hopping.Comment: 11 page

Preferential oxidation of CO (CO-PROX) over CuOx/CeO2 coated microchannel reactor

The general aspects of the synthesis and characterization results of a CuOx/CeO2 catalyst were presented. In addition the principal steps for manufacturing a microchannel reactor and for the coating of the CuOx/CeO2 catalyst onto the microchannels walls, were also summarized. The catalytic activity of this microchannel reactor during the preferential oxidation of CO (CO-PROX) was evaluated employing a feed-stream that simulates a reformate off-gas after the WGS unit. Two activation atmospheres were studied (H2/N2 and O2/N 2). The reducing pretreatment improved the resistance to deactivation by formation of carbonaceous species over the catalyst surface at high temperatures. The presence of H2O and CO2 in the feed-stream was also analyzed indicating that the adsorption of CO2 inhibited the conversion of CO at lower temperatures because these compounds modified the active sites through the formation of carbonaceous species on the catalyst surface. Finally, the experimental results of the microreactor performance were compared with CFD simulations that were carried out using a kinetic for the CuOx/CeO2 powder catalyst. The experimental results were reasonably well described by the model, thus confirming its validity.Peer Reviewe