Achilles Tendon and Athletes

Achilles tendon (AT) is the strongest human tendon. AT disorders are common among athletes. AT pathologies vary from tendinopathy to frank rupture. Diagnosis is made clinically. Imaging modalities are used adjunctively. Management of AT rupture in athletes is challenging to surgeons due to worldwide growing popularity of sports and potential social and financial impact of AT injury to an athlete. Hence, new surgical techniques aim at attaining quick recovery with good outcome, finding similar results with both open and percutaneous techniques when accompanying these with functional rehabilitation protocols. Non-operative strategies include shoe wear modification, physiotherapy and extracorporeal shock wave therapy. Surgical interventions vary based on the AT pathology nature and extent. Direct repair can work for small-sized defects. V-Y gastrocnemius advancement could approximate the tendon edges for repair within 2–8 cm original gap. Gastrocnemius turndown can bridge tendon loss > 8 cm. Autogenous, allogeneous or synthetic tendon grafts were used for AT reconstruction purposes. In AT tendinopathies with no tendon tissue loss, surgical procedures revolve around induction of tissue repair through lesion incision or debridement to full detachment followed by reattachment. Extra-precautions are exercised for prevention of AT disorders especially among susceptible athletes participating in sports involving excessive AT strain

ADSORPTION OF COPPER AND ZINC ON HALLOYSITE NANOTUBES MODIFIED BY POLYETHYLENE IMINE: KINETIC AND THERMODYNAMIC STUDIES

This work was supported by the Program 211 of the Government of the Russian Federation, RFBR grants 17-03-00641 and 18-29- 12129mk, the State Task from the Ministry of the Education and Science of the Russian Federation

Patient-specific Instrumentation Versus Standard Surgical Instruments in Primary Reverse Total Shoulder Arthroplasty: A Retrospective Comparative Clinical Study.

AimsPatient-specific instrumentation (PSI) in primary shoulder arthroplasty has been studied; results supported the positive impact of the PSI on the glenoid positioning. Nevertheless, no clinical outcomes have been reported. We compare the clinical outcomes of primary reverse total shoulder arthroplasty using PSI versus the standard methods.MethodsFifty-three patients with full records and a minimum of 24-months follow-up were reviewed, 35 patients received primary standard RSTA, and 18 patients received primary PSI RSTA. All patients were operated on in a single center. The median follow-up was 46 months (53 months in the standard group vs 39 months in the PSI group).ResultsThere was an overall significant post-operative improvement in the whole cohort (PConclusionIn this series, both groups achieved comparable good outcomes. PSI did not achieve significantly better clinical outcomes than Standard after primary RSTA. Yet comparison has some limitations. PSI did not negatively impact the waiting time or the surgical time

АНАЛИЗ СИСТЕМЫ Nb-Al И СИНТЕЗ ОДНОГО ИЗ ИНТЕРМЕТАЛЛИДОВ

Работа выполнена в рамках гранта РНФ (проект № 22-23-00322)

Uranium (VI) Sorption Using Functionalized-Chitosan Magnetic Nanobased Particles

International audienceHybrid materials were synthesized by chemical grafting of different compounds (diethylenetriamine DETA, cysteine, alanine and serine) on chitosan/magnetite nanoparticles. The sorbents were characterized by TEM, XRD and FTIR analysis and vibrating sample magnetometry (VSM) before being tested for uranium sorption. The nanometric size of sorbent particles reduces the impact of diffusion resistance and uptake kinetics are quite fast. Sorption isotherms are modeled by the Langmuir equation. The sorption is spontaneous and exothermic. Uranium is desorbed using acidic thiourea and the sorbent can be recycled for at least 4/5 cycles

Sorption of Rare Earth Metal Ions (La(III), Nd(III) and Er(III)) using Cellulose

International audienceBackground: Rare earth elements, REEs, are used for many high-tech applications; the rarefaction of the resource requires developing methods for their recovery from low-grade sources and their recycling from waste materials. Sorption processes, including biosorbents, represent an interesting method for their recovery from dilute effluents.Objective: This work investigates the sorption of 3 REEs using a cheap, renewable biosorbents: microcrystalline cellulose (considered as a reference material for on-going research on chemically modified materials).Methods: Sorption properties are studied considering the effect of pH, the uptake kinetics, the sorption isotherms, the thermodynamic parameters, the recycling of the material and its reuse for successive sorption/desorption cycles.Results: Metal sorption increases with pH, uptake kinetics are relatively fast with an equilibrium reached within 3-4 hours. The kinetic profiles are well fitted by the pseudo-second order rate equation. Maximum sorption capacity reaches 31-53 mg metal g-1, and the Langmuir equation fits well sorption isotherms. The reaction is endothermic and spontaneous. Metal ions can be readily desorbed with 0.5 M HNO3 solutions and the sorbent can be recycled for at least 4 cycles of sorption/desorption with limited decrease in performance (less than 3 %). FTIR and XRD analyses contribute to the characterization of the material and the interpretation of sorption mechanism.Conclusion: Microcrystalline cellulose has low sorption capacities for La(III), Nd(III), and Er(III); however, this renewable resource with high effectiveness in terms of recycling and re-use is a promising support for metal recovery

Chemical modifications of chitosan nano-based magnetic particles for enhanced uranyl sorption

International audienceThe grafting of diethylenetriamine (preferentially to the grafting of serine > cysteine > alanine) onto chitosan (immobilized on magnetic nano-based particles by combined polymer precipitation and hydrothermal treatment) allows synthesizing an efficient sorbent for uranyl at pH 4 (maximum sorption capacity close to 185 mg U g(-1)). Sorption isotherm (regardless of the sorbent) is fitted by the Langmuir equation, while uptake kinetics is well described by the pseudo-second order rate equation. The design of nano-based particles (10-50 nm) allows reducing the impact of resistance to intraparticle diffusion on uptake kinetics and the equilibrium contact time is close to 45-60 min. The super paramagnetic properties of the hybrid materials make their solid/liquid separation quite easy using an external magnetic field. Finally uranyl ions can be desorbed using acidic urea solution (0.5 M, pH >2) and the sorbents can be recycled for at least 5/6 cycles with a limited loss of sorption capacity (<9%)

Uranium and neodymium biosorption using novel chelating polysaccharide

International audienceA direct reaction is described to prepare hydrophobic ce-aminomethylphosphonic acid as a novel chitosan-based material. It exhibits chelating properties for polyvalent metal ions such as U(VI) and Nd(III) ions. The new sorbent was fully characterized using Elemental analysis, scanning electron microscope (SEM) and FFIR spectra. Different parameters were examined in order to evaluate the optimum conditions for U(VI) and Nd(III) ions biosorption. Sorption mechanisms of metal ions were investigated using kinetic and isotherm models. In addition, the sorbent selectivity was tested for both metal ions together in a binary solution. (C) 2017 Elsevier B.V. All rights reserved

Functionalization of poly(glycidylmethacrylate) with iminodiacetate and imino phosphonate groups for enhanced sorption of neodymium - sorption performance and molecular modeling

International audiencePolyglycidyl methacrylate (PGMA, obtained by dispersion polymerization method) can be successfully functionalized to improve the sorption of Nd(III). Pristine PGMA is first modified by amination (N-PGMA), before grafting amino-alkylcarboxylate and amino-alkylphosphonic ligands to produce A-PGMA and P-PGMA, respectively. These materials are characterized by CHNP, FTIR-spectrometry, XRD, TG-TDA and pHzpc. Following that, the Nd(III) sorption properties are compared. At optimum pH: 4.5–5.0, the sorbents can be ranked according the series: P-PGMA (0.645 mmol Nd g−1) 91%. Theoretical DFT calculation (molecular modeling) and FTIR spectroscopy, the interactions of Nd(III) with reactive functional groups (carboxyl, hydroxyl, amine and phosphonate groups) are characterized. Finally, the sorbents are tested on pre-treated leachate of Egyptian monazite: REEs' sorption performances are correlated with their intrinsic properties and compared for the two sorbents

Evaluation of adsorption behavior for U(VI) and Nd(III) ions onto fumarated polystyrene microspheres

International audienceFumarated polystyrene microspheres were prepared using emulsion polymerization technique. Different instrumental techniques such as elemental analysis, SEM and FTIR were employed for full characterization of the synthetic resin. Different parameters such as pH, time and initial metal ions concentration were examined to evaluate the optimum conditions for U(VI) and Nd(III) ions sorption. For both metal ions, the sorption process fitted well with pseudo-second order kinetic model and Langmuir isotherm model. The maximum adsorption capacities were found to be 83.11 mg U g(-1) and 39.68 mg Nd g(-1). The loaded sorbent was regenerated using 0.5 M HNO3