Resultados clínicos de la artroplastia unicompartimental de rodilla en un hospital universitario

Se ha realizado un estudio retrospectivo de 25 artroplastias unicompartimentales de rodilla intervenidas de 1989 a 2008, En 15 casos (16 prótesis) se obtuvieron datos completos para su estudio. Once artroplastias se realizaron en mujeres y 5 en hombres con una edad media de 65 años. El tiempo de seguimiento fue de 65 meses (rango 14-202). Analizamos el rango de movilidad, la necesidad de cirugía de revisión y la puntuación en el Knee Society Store. Hubo de casos de infección superficial resueltos favorablemente y ningún caso de infección profunda. La cirugía de revisión fue necesaria en el 37,5% de pacientes en una media de tiempo de 37'5 meses (rango 18-128). Los resultados fueron similares a aquellos que hicieron que se abandonara la técnica en los años 90.Unicompartmental knee arthroplasty appeared at the 70s as an alternative to the proximal tibial osteotomy in young patients with pain and medial or lateral compartment osteoarthritis of the knee. At the 90s this technique began to be abandoned because the clinical results were not the expected. In the last years, lots of articles have been published showing results that can be compared with the total knee arthroplasty thanks to the news designs and the improve of the surgical technique. A retrospective study was made of the 25 unicompartmental knee arthroplasties performed in our hospital, with a mean follow up of 65 months. We analysed the range of mobility, the need of revision surgery and the Knee Society Score, getting similar results to that that made abandon the technique in the 90s

NEXT-100 Technical Design Report (TDR). Executive Summary

In this Technical Design Report (TDR) we describe the NEXT-100 detector that will search for neutrinoless double beta decay (bbonu) in Xe-136 at the Laboratorio Subterraneo de Canfranc (LSC), in Spain. The document formalizes the design presented in our Conceptual Design Report (CDR): an electroluminescence time projection chamber, with separate readout planes for calorimetry and tracking, located, respectively, behind cathode and anode. The detector is designed to hold a maximum of about 150 kg of xenon at 15 bar, or 100 kg at 10 bar. This option builds in the capability to increase the total isotope mass by 50% while keeping the operating pressure at a manageable level. The readout plane performing the energy measurement is composed of Hamamatsu R11410-10 photomultipliers, specially designed for operation in low-background, xenon-based detectors. Each individual PMT will be isolated from the gas by an individual, pressure resistant enclosure and will be coupled to the sensitive volume through a sapphire window. The tracking plane consists in an array of Hamamatsu S10362-11-050P MPPCs used as tracking pixels. They will be arranged in square boards holding 64 sensors (8 times8) with a 1-cm pitch. The inner walls of the TPC, the sapphire windows and the boards holding the MPPCs will be coated with tetraphenyl butadiene (TPB), a wavelength shifter, to improve the light collection.Comment: 32 pages, 22 figures, 5 table

SiPMs coated with TPB : coating protocol and characterization for NEXT

Silicon photomultipliers (SiPM) are the photon detectors chosen for the tracking readout in NEXT, a neutrinoless {\beta}{\beta} decay experiment which uses a high pressure gaseous xenon time projection chamber (TPC). The reconstruction of event track and topology in this gaseous detector is a key handle for background rejection. Among the commercially available sensors that can be used for tracking, SiPMs offer important advantages, mainly high gain, ruggedness, cost-effectiveness and radio-purity. Their main drawback, however, is their non sensitivity in the emission spectrum of the xenon scintillation (peak at 175 nm). This is overcome by coating these sensors with the organic wavelength shifter tetraphenyl butadienne (TPB). In this paper we describe the protocol developed for coating the SiPMs with TPB and the measurements performed for characterizing the coatings as well as the performance of the coated sensors in the UV-VUV range.Comment: Submitted to the Journal of Instrumentation on december 26th 201