Preserving the superficial branch of the radial nerve during carpometacarpal and metacarpophalangeal joint arthroscopy: an anatomical study

International audienceThe superficial branch of the radial nerve (SBRN) is potentially at risk during thumb carpometacarpal (TCM) or thumb metacarpophalangeal (TMP) joint arthroscopy. The aim of this anatomical study was to describe the different branching patterns of the SBRN and to optimize positioning of portals during TCM and TMP arthroscopy. The SBRN was dissected in 30 forearms. Three branches of the nerve (SR1, SR2, and SR3) were recorded and distances between SBRN branches and portals used for carpometacarpal (TCM) and metacarpophalangeal (TMP) joints of the thumb arthroscopy were measured. Three main portals were used for TCM joint arthroscopy. These portals were an ulnar portal (1-U), a radial portal (1-R), and an accessory portal (D-2). A radial metacarpophalangeal (MCP-rad) and an ulnar metacarpophalangeal (MCP-uln) portal were used for TMP joint arthroscopy. In 24 cases (80%), the 1-R portal was inserted radially (volar) to SR3 at a mean distance of 4.8 mm (0-8). In the remaining six cases (20%) when 1-R portal was inserted ulnar (dorsal) to SR3, the distance was less than 2 mm in all cases. SR3 was always far from the 1-U portal at a mean 13 mm (7-22). The D-2 portal was always close to SR2-D1 at a mean distance of 1.7 mm (0-6). The distance from SR2-D2 and D-2 portal was also inferior by 5 mm. At the level of the metacarphalangeal joint of the thumb, the MCP-rad portal was always situated dorsally and very close to SR3, at a mean distance of 1 mm (0-5). The MCP-uln portal was also situated dorsal to SR2-D1 at a mean distance of 3.7 mm (1.5-6.5). The results of this anatomical study confirm actual reported findings about the SR2 and SR3 branches. These two branches of the SBRN are the most at risk of injury during TCM and TMP joint arthroscopy. According to our measurements, the 1-U portal is a safer portal than 1-R and D-2 portal for TCM arthroscopy and should be preferred for surgery necessitating only one portal. Concerning TMP arthroscopy, the SBRN appears less at risk of injury when using a MCP-uln portal and safer than MCP-rad which is at risk at less than 5 mm from the extensor pollicis longus tendon

Anatomical study of the lateral femoral cutaneous nerve with special reference to minimally invasive anterior approach for total hip replacement

International audienc

Emulsion comprising antioxidant particles

The present invention relates to compositions comprising particles prepared from one or more biological materials and/or animal lipids and/or plant lipids that are capable of locating to an interface when combined with two or more immiscible liquids. Emulsions comprising the compositions comprising particles, wherein the emulsion has an internal phase dispersed in a continuous external phase and the particles are located at the interface of the external and the internal phase, methods of preparing such compositions and emulsions, the use of such compositions and emulsions and products containing the compositions and emulsions are also described

Are ligament-tensioning devices interchangeable? A study of femoral rotation

International audienceBackground - During total knee arthroplasty (TKA), femoral rotation can be adjusted either in relation to bony landmarks or by tensioning the ligaments with the knee in 90° of flexion. The primary objective of this study was to compare femoral rotations achieved using various ligament-tensioning devices. The secondary objective was to compare these femoral rotations to that indicated by the transepicondylar axis (TEA). Material and methods - We performed 13 posterior-stabilised TKA procedures using HiFit (Ceraver(®)) on cadaver knees. Before performing the posterior condyle cut, we used an original method to measure the femoral rotation induced by five different ligament-tensioning devices (2 with a ratchet mechanism, 1 with screws, 1 force-sensing device, and 1 with spacer blocks) and the central tibio-femoral distance (CTFD). Results - Both ratchet tensioners provided significantly greater mean external rotation values (P=0.002), of 4.94° and 4.46°, respectively, compared to the force-sensing and spacer tensioners. Significant differences were found across devices for CTFD, with a mean difference of about 2mm between the ratchet and screw tensioners versus the force-sensing and spacer tensioners. The mean differences in rotations obtained using the tensioners versus the TEA were close to 0° but with standard deviations greater than 4°. Conclusion - Femoral rotation was dependent on the distraction force applied to the joint. Tensioners that did not measure the distraction force were associated with greater distraction force and external rotation values. The TEA criterion did not reliably indicate good ligament balance. Level of evidence - Experimental study

Metabolomic study of tolerance to water limitation for sunflower germination

Metabolomic study of tolerance to water limitation for sunflower germination. Metabolomics 2016. 12. Annual Conference of the Metabolomics Societ

Metabolomic study of tolerance to water limitation for sunflower germination

Metabolomic study of tolerance to water limitation for sunflower germination. Metabolomics 2016. 12. Annual Conference of the Metabolomics Societ

Metabolomic characterization of sunflower leaf allows discriminating genotype groups or stress levels with a minimal set of metabolic markers

This study underlines the potential of metabolic markers for discriminating genotype groups and environmental conditions. Their potential use for prediction is discussed.Développer de nouvelles variétés de maïs pour une agriculture durable: une approche intégrée de la génomique à la sélectio

Primary metabolism investigation of fleshy fruit species using 1H-NMR profiling

National audienc

The Evolution of Effort-Reward Imbalance in Workers during the COVID-19 Pandemic in France - An Observational Study in More than 8000 Workers

International audience(1) Background: The effects of lockdown repetition on work-related stress, expressed through Effort-Reward Imbalance (ERI), during the COVID-19 pandemic are poorly documented. We investigated the effect of repetitive lockdowns on the ERI in French workers, its difference across occupations, and the change in its influencing factors across time. (2) Methods: Participants were included in a prospective cross-sectional observational study from 30 March 2020 to 28 May 2021. The primary outcome was the ERI score (visual analog scale). The ERI score of the population was examined via Generalized Estimating Equations. For each period, the factors influencing ERI were studied by multivariate linear regression. (3) Results: In 8121 participants, the ERI score decreased in the first 2 lockdowns (53.2 ± 0.3, p < 0.001; 50.5 ± 0.7, p < 0.001) and after lockdown 2 (54.8 ± 0.8, p = 0.004) compared with the pre-pandemic period (59 ± 0.4). ERI was higher in medical than in paramedical professionals in the pre-pandemic and the first 2 lockdowns. Higher workloads were associated with better ERI scores. (4) Conclusions: In a large French sample, Effort-Reward Imbalance worsened during the COVID-19 pandemic until the end of the 2nd lockdown. Paramedical professionals experienced a higher burden of stress compared with medical professionals