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Niels Hendrik Bech, Daniel Haverkamp
In this review, we bring to the attention of the reader three relatively unknown types of hip impingement. We explain the concept of low anterior inferior iliac spine (AIIS) impingement, also known as sub-spine impingement, ischio-femoral impingement (IFI) and pelvi-trochanteric impingement. For each type of impingement, we performed a search of relevant literature.We searched the PubMed, Medline (Ovid) and Embase databases from 1960 to March 2016. For each different type of impingement, a different search strategy was conducted...
February 2018: EFORT Open Reviews
David J R Brook, Connor Fleming, Dorothy Chung, Cardius Richardson, Servando Ponce, Raja Das, Hariharan Srikanth, Ranko Heindl, Bruce C Noll
The verdazyl 'pincer' ligand, 1-isopropyl-3,5-dipyridyl-6-oxoverdazyl (dipyvd), coordinates iron to form a series of pseudooctahedral coordination compounds [Fe(dipyvd)2]n+ (n = 0-3). In the case where n = 2, the molecular geometry and physical and spectral properties are consistent with a low spin (S = 0) iron(ii) ion coordinated by two ferromagnetically coupled radical ligands. Upon one electron reduction, the room temperature effective magnetic moment of the complex jumps from μeff = 2.64 to μeff = 5.86 as a result of spin crossover of the iron atom combined with very strong ferromagnetic coupling of the remaining ligand centered unpaired electron with the metal center...
April 13, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Eugenio Jannelli, Antonina Parafioriti, Alberto Acerbi, Alessandro Ivone, Alberto Fioruzzi, Andrea Fontana
Objective The International Cartilage Repair Society classification is the one mainly used to define chondral defects. However, this classification does not include delamination. The objective of the study is to describe the characteristics of this lesion to better explain its classification in the context of chondral lesions of the hip. Design We performed a retrospective analysis of 613 patients who underwent hip arthroscopy. In this group, the incidence, localization, histological characteristics, and association to femoroacetabular impingement as well as to other intraarticular lesions of acetabular delamination (AD) were analyzed...
April 1, 2018: Cartilage
Kseniya K Borisova, Elizaveta A Kvyatkovskaya, Eugeniya V Nikitina, Rinat R Aysin, Roman A Novikov, Fedor I Zubkov
A rare example of chemospecificity in the tandem Diels-Alder reaction of activated alkynes and bis-dienes has been revealed. The reaction between bis-furyl dienes and DMAD occurs at 25-80 °C and leads to kinetically controlled "pincer" adducts, 4a,8a-disubstituted 1,4:5,8-diepoxynaphthalenes. On the contrary, only thermodynamically controlled "domino" adducts (2,3-disubstituted 1,4:5,8-diepoxynaphthalenes) are formed in the same reaction at 140 °C. The "pincer" adducts can be transformed to the "domino" adducts at heating...
April 4, 2018: Journal of Organic Chemistry
Joanne L Kemp, May Arna Risberg
Femoroacetabular impingement (FAI) is the abnormal osseous contact between the femur (cam impingement) and/or acetabular rim (pincer impingement) during end-range hip motions. This special issue on FAI aims at closing some of the gaps between clinical practice and research findings, important for all health professions treating patients with hip pain. This special issue will explore several aspects of FAI syndrome. Specifically, it will provide clinicians with a greater understanding of the etiology and prevalence of hip morphology seen in FAI syndrome, and its relationship with hip range of motion, muscle strength, and hip osteoarthritis (OA)...
April 2018: Journal of Orthopaedic and Sports Physical Therapy
Yoshiaki Nishibayashi, Yoshiya Sekiguchi, Kazuya Arashiba, Hiromasa Tanaka, Aya Eizawa, Kazunari Nakajima, Kazunari Yoshizawa
Newly designed and prepared vanadium complexes bearing anionic pyrrole-based PNP-type pincer and aryloxy ligands are found to work as effective catalysts toward the direct conversion of molecular dinitrogen into ammonia and hydrazine under mild reaction conditions. This is the first successful example of vanadium-catalyzed nitrogen fixation under mild reaction conditions.
March 30, 2018: Angewandte Chemie
Andrea B Mosler, Adam Weir, Andreas Serner, Rintje Agricola, Cristiano Eirale, Abdulaziz Farooq, Arnhild Bakken, Kristian Thorborg, Rod J Whiteley, Per Hölmich, Roald Bahr, Kay M Crossley
BACKGROUND: Musculoskeletal hip/groin screening tests are commonly performed to detect at-risk individuals. Bony hip morphology is considered a potential intrinsic risk factor but has not been examined prospectively. PURPOSE: To evaluate the association between intrinsic risk factors identified from musculoskeletal and radiographic screening tests and hip/groin injuries leading to time loss from training and/or match play in professional male soccer players. STUDY DESIGN: Prospective cohort study; Level of evidence, 2...
March 1, 2018: American Journal of Sports Medicine
Yuxuan Yi, Huiying Liu, Ling-Ping Xiao, Bo Wang, Guoyong Song
The search for nonprecious metal catalysts for the synthesis of γ-valerolactone (GVL) through hydrogenation of levulinic acid and its derivative in an efficient fashion is of great interest and importance, as GVL is an important a sustainable liquid. We herein report a pincer iron complex can efficiently catalyze the hydrogenation of levulinic acid and methyl levulinate into GVL, achieved up to 23000 turnover numbers and 1917 h-1 turnover frequencies. This iron catalyst also enabled the formation of GVL from various biomass-derived carbohydrates in aqueous solution, thus paving a new way toward a renewable chemical industry...
March 25, 2018: ChemSusChem
Elhadi Sariali, Filippo Vandenbulcke
PURPOSE: Although the arthroscopic management of femoroacetabular impingement (FAI) is increasing, severe complications have been reported due to traction. We developed an arthroscopic technique based on an initial capsulotomy and a minimal traction approach. The main purpose of this study was to analyze the clinical outcomes of FAI treatment using this technique after at least two years of follow-up. METHODS: Forty-seven consecutive patients underwent surgery for FAI...
March 23, 2018: International Orthopaedics
Dalton B Burks, Shakeyia Davis, Robert W Lamb, Xuan Liu, Roberta R Rodrigues, Nalaka P Liyanage, Yujie Sun, Charles Edwin Webster, Jared H Delcamp, Elizabeth T Papish
The first example of a CNC pincer ligand with a central pyridinol ligand is reported in a nickel(ii) complex. This metal complex can be protonated or deprotonated reversibly in situ to switch on or off the photocatalytic performance towards CO2 reduction. The O- substituent appears essential for catalysis.
March 21, 2018: Chemical Communications: Chem Comm
Andrea B Mosler, Rintje Agricola, Kristian Thorborg, Adam Weir, Rod J Whiteley, Kay M Crossley, Per Hӧlmich
Study Design Cross-sectional cohort study. Background Athletes with femoroacetabular impingement (FAI) syndrome have cam and/or pincer morphology, pain on orthopaedic testing, and often have reduced hip range of motion (ROM) and strength. However, cam and pincer morphology are also common in asymptomatic hips. Therefore, it is currently unknown whether the ROM and strength deficits observed in athletes with FAI syndrome result from the variance in their bony hip morphology or hip condition. Objectives To investigate the relationship between musculoskeletal screening findings and bony hip morphology in asymptomatic male soccer players...
March 16, 2018: Journal of Orthopaedic and Sports Physical Therapy
Pim van Klij, Joshua Heerey, Jan H Waarsing, Rintje Agricola
Synopsis Our understanding of femoroacetabular impingement (FAI) syndrome is slowly improving. The number of studies on all aspects (aetiology, prevalence, pathophysiology, natural history, treatment, and preventative measures) of FAI syndrome has grown exponentially over the past few years. This commentary provides the latest updates on the prevalence of cam and pincer hip morphology and its relationship with development of hip osteoarthritis (OA). Cam and pincer morphology is highly prevalent in the general population and in this paper is presented for different subgroups based on: age, sex, ethnicity, and athletic activity...
March 16, 2018: Journal of Orthopaedic and Sports Physical Therapy
Thomas George Back, Kai N Sands, Tyler A Tuck
Selenium compounds play an important role in redox homeostasis in living organisms. One of their major functions is to suppress the harmful effects of hydrogen peroxide, hydroperoxides and downstream reactive oxygen species that lead to oxidative stress, which has in turn been implicated in many diseases and degenerative conditions. The glutathione peroxidase (GPx) family of selenoenzymes plays a key protective role by catalyzing the reduction of peroxides with glutathione. Considerable effort has been expended toward the discovery of small-molecule selenium compounds that mimic GPx...
March 14, 2018: Chemistry: a European Journal
Nicholas R Andreychuk, Tara Dickie, David J H Emslie, Hilary A Jenkins
Palladium-catalyzed coupling of 1-adamantylamine (2 equiv.) with 4,5-dibromo-2,7-di-tert-butyl-9,9-dimethylxanthene afforded the proligand 4,5-bis(1-adamantylamino)-2,7-di-tert-butyl-9,9-dimethylxanthene, H2 [XAd] (1), which upon deprotonation with excess KH or KCH2 Ph in THF or dme generated [{K(THF)3 }2 (XAd)] (2a) and [K2 (XAd)(dme)] (2b). Subsequent reaction of in situ generated 2a or 2b with [ThCl4 (dme)2 ] yielded [(XAd)ThCl4 K2 ]·x(dme) (3; x = 0.5-2), which reacted with 2 equiv. of LiCH2 SiMe3 or K[allylTMS ] to afford the bis(hydrocarbyl) complexes [(XAd)Th(CH2 SiMe3 )2 (THF)] (4) and [(XAd)Th(η3 -allylTMS )2 ] {5; allylTMS = 1-(SiMe3 )C3 H4 }...
March 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Michael Ryan, Thomas Youm, Jonathan Vigdorchik
Hip arthroscopy as we know it today developed over the last 15 to 20 years, yet its true beginning is far more dated. Initially developed as a means of removing loose bodies or as a means of lavage, hip arthroscopy was not utilized to treat femoroacetabular impingement (FAI) until much later. Its usefulness as a means of treating FAI did not arise until hip impingement was understood to be causal in the development of degenerative changes of the labrum and articular surfaces. As our understanding of FAI grew, the tools for treating it developed in tandem...
March 2018: Bulletin of the Hospital for Joint Diseases
Xiao-Niu Cao, Xiao-Min Wan, Fa-Liu Yang, Ke Li, Xin-Qi Hao, Tian Shao, Xinju Zhu, Mao-Ping Song
A series of novel ruthenium(II) complexes supported by a symmetrical NNN ligand were prepared and fully characterized. These complexes exhibited good performance in transfer hydrogenation to form new C-C bonds using alcohols as the alkylating agents, generating water as the only byproduct. A broad range of substrates, including (hetero)aryl- or alkyl-ketones and alcohols, were well tolerated under the optimized conditions. Notably, α-substituted methylene ketones were also investigated, which afforded α-branched steric hindrance products...
March 13, 2018: Journal of Organic Chemistry
Minh Tho Nguyen, Bulat Gabidullin, Georgii I Nikonov
The new zinc complexes 2,6-(ArN[double bond, length as m-dash]CH)2 C6 H3 ZnBu (6) and 2,6-(ArN[double bond, length as m-dash]CH)2 C6 H3 ZnCl2 Li(THF)3 (7), supported by a bis(imino)phenyl NCN pincer ligand, were prepared (Ar = 2,6-i Pr2 C6 H3 ). The reaction of complex 7 with LiHBEt3 resulted in a hydride transfer to the C[double bond, length as m-dash]N imine group to afford an unusual zinc dimer [η1 (C),κ1 (Nimine )-2-(ArN[double bond, length as m-dash]CH)-6-(Zn-N(Ar)CH2 )C6 H3 Zn]2 (9). The latter transformation occurs via the formation of compound (η1 (C),κ1 (N)-2,6-(ArN[double bond, length as m-dash]CH)2 C6 H3 )2 Zn (8) which can also be accessed by the reduction of 7 with KC8 ...
March 8, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Yulei Wang, Zhidao Huang, Xuebing Leng, Huping Zhu, Guixia Liu, Zheng Huang
The first general catalytic approach to effecting transfer hydrogenation (TH) of unactivated alkenes using ethanol as the hydrogen source is described. A new NCP-type pincer iridium complex (BQ- NCO P)IrHCl containing a rigid benzoquinoline backbone has been developed for efficient, mild TH of unactivated C-C multiple bonds with ethanol, forming ethyl acetate as the sole byproduct. A wide variety of alkenes, including multisubstituted alkyl alkenes, aryl alkenes, and heteroatom-substituted alkenes, as well as O- or N-containing heteroarenes and internal alkynes, are suitable substrates...
March 8, 2018: Journal of the American Chemical Society
Javier Brugos, Javier A Cabeza, Pablo García-Álvarez, Enrique Pérez-Carreño, Diego Polo
The non-donor-stabilized PSnP pincer-type stannylene Sn(NCH2 Pt Bu2 )2 C6 H4 (1) has been prepared by treating SnCl2 with Li2 (NCH2 Pt Bu2 )2 C6 H4 . All attempts to synthesize the analogous PSiP silylene by reduction of the (previously unknown) silanes SiCl2 (NCH2 Pt Bu2 )2 C6 H4 (2), SiHCl(NCH2 Pt Bu2 )2 C6 H4 (3) and SiH(HMDS)(NCH2 Pt Bu2 )2 C6 H4 (4; HMDS = N(SiMe3 )2 ) have been unsuccessful. The almost planar (excluding the tert-butyl groups) molecular structure of stannylene 1 (determined by X-ray crystallography) has been rationalized with the help of DFT calculations, which have shown that, in the series of diphosphanetetrylenes E(NCH2 Pt Bu2 )2 C6 H4 (E = C, Si, Ge, Sn), the most stable conformation of the compounds with E = Ge and Sn has both P atoms very close to the EN2 C6 H4 plane, near (interacting with) the E atom, whereas for the compounds with E = C and Si, both phosphane groups are located at one side of the EN2 C6 H4 plane and far away from the E atom...
March 6, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Xinxin Tang, Xiangqing Jia, Zheng Huang
Alkanes, the main constituents of petroleum, are attractive feedstocks for producing value-added chemicals. Linear aldehydes and amines are two of the most important building blocks in the chemical industry. To date, there have been no effective methods for directly converting n-alkanes to linear aldehydes and linear amines. Here, we report a molecular dual-catalyst system for production of linear aldehydes via regioselective carbonylation of n-alkanes. The system is comprised of a pincer iridium catalyst for transfer-dehydrogenation of the alkane using t-butylethylene or ethylene as a hydrogen acceptor working sequentially with a rhodium catalyst for olefin isomerization-hydroformylation with syngas...
March 2, 2018: Journal of the American Chemical Society
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