46 research outputs found
Antero-medial approach to the wrist: anatomic basis and new application in cases of fracture of the lunate facet
The Henry approach is the classical anterolateral surgical exposure of the volar
aspect of the distal radius. This approach does not allow good access to the medial
side of the volar distal radius (lunate facet) and the distal radio-ulnar joint, unless it
is extended proximally, retracting the tendons and the median nerve medially,
which can cause some trauma. The purpose of our study was to investigate the
anatomic basis and to outline the advantages of the unusual anteromedial approach,
reporting our experience in the treatment of 4 distal radius fractures, with
a 90° or 180° twist of the lunate facet, and 10 wrist dissections on cadavers. The
average follow-up was 68.8 months (range 18 to 115 months). In our series, this
approach did not cause any nerve injuries or any sensory loss of the distal forearm
and the palm. All the fractures of the lunate facet and of the radial styloid process
healed. One patient with an ulnar styloid process fracture associated showed pseudarthrosis,
but with no instability of the distal radio-ulnar joint or pain on the ulnar
side. Using the criteria of Green and O’Brien, modified by Cooney, the results
were: excellent in two cases, good in one case, and average in another. The evaluation
of arthritis according to Knirk and Jupiter’s classification showed grade 0 in
three cases and grade 3 in one case with osteochondral sclerosis. We showed that
the anteromedial approach is reliable and convenient in the case of fractures situated
in the antero-medial portion of the radius, for the double objective of reducing
the fracture under direct control and checking the congruence of the distal
radio-ulnar joint. (Folia Morphol 2011; 70, 3: 204–210
Modulating the photoluminescence of bridged silsesquioxanes incorporating Eu(3+)-complexed n,n '-diureido-2,2 '-bipyridine isomers: application for luminescent solar concentrators
Two new urea-bipyridine derived bridged organosilanes (P5 and P6) have been synthesized and their hydrolysis-condensation under nucleophilic catalysis in the presence of Eu(3+) salts led to luminescent bridged silsesquioxanes (M5-Eu and M6-Eu). An important loading of Eu(3+) (up to 11%(w)) can be obtained for the material based on the 6,6'-isomer. Indeed the photoluminescence properties of these materials, that have been investigated in depth (photoluminescence (PL), quantum yield, lifetimes), show a significantly different complexation mode of the Eu(3+) ions for M6-Eu, compared with M4-Eu (obtained from the already-reported 4,4'-isomer) and M5-Eu. Moreover, M6-Eu exhibits the highest absolute emission quantum yield value (0.18 +/- 0.02) among these three materials. The modification of the sol composition upon the addition of a malonamide derivative led to similar luminescent features but with an increased quantum yield (026 +/- 0.03). In addition, M6-Eu can be processed as thin films by spin-coating on glass substrates, leading to plates coated by a thin layer (similar to 54 nm) of Eu(3+)-containing hybrid silica exhibiting one of the highest emission quantum yields reported so far for films of Eu(3+)-containing hybrids (0.34 +/- 0.03) and an interesting potential as new luminescent solar concentrators (LSCs) with an optical conversion efficiency of similar to 4%. The ratio between the light guided to the film edges and the one emitted by the surface of the film was quantified through the mapping of the intensity of the red pixels (in the RGB color model) from a film image. This quantification enabled a more accurate estimation of the transport losses due to the scattering of the emitted light in the film (0.40), thereby correcting the initial optical conversion efficiency to a value of 1.7%.FCT - PTDC/CTM/101324/2008COMPETEFEDE
Conduite à tenir devant un xanthelasma de découverte fortuite
Le xanthélasma, variété de xanthome, est une lésion cutanée bénigne que l'on retrouve spécifiquement au niveau des paupières. Il s'agit de dépôts lipidiques intradermiques dont le mécanisme physiopathologique reste encore aujourd'hui indéterminé. Cette lésion est associée dans près d'un cas sur deux à des anomalies du métabolisme lipidique, il semble donc important de contrôler de façon systématique les marqueurs biologiques (cholestérol, triglycérides) lors de la découverte d'une telle lésion. Outre la gêne esthétique qu'elle occasionne très fréquemment, elle signerait dans près de 50 % des cas un facteur de risque cardio-.vasculaire. Les différentes thérapeutiques sur le plan de la symptomatologie clinique restent manifestement limitées dans le temps en raison d'un risque important de récidive. Par contre, les thérapeutiques visant à la régulation des taux de cholestérol et triglycérides ont elles, toute leur place. Il semble bon de rappeler que les pathologies cardio-vasculaires représentent la première cause de mortalité dans le monde et la seconde cause en France juste après les cancers.BORDEAUX2-BU Santé (330632101) / SudocSudocFranceF
Le muscle présternal chez les Mélano-Indiens.
Gaillard J., Caix M. Le muscle présternal chez les Mélano-Indiens.. In: Bulletins et Mémoires de la Société d'anthropologie de Paris, X° Série. Tome 10 fascicule 3, 1959. pp. 264-272