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https://www.readbyqxmd.com/read/28110243/a-biomechanical-testing-system-to-determine-micromotion-between-hip-implant-and-femur-accounting-for-deformation-of-the-hip-implant-assessment-of-the-influence-of-rigid-body-assumptions-on-micromotions-measurements
#1
Steven Leuridan, Quentin Goossens, Jorg Roosen, Leonard Pastrav, Kathleen Denis, Michiel Mulier, Wim Desmet, Jos Vander Sloten
BACKGROUND: Accurate pre-clinical evaluation of the initial stability of new cementless hip stems using in vitro micromotion measurements is an important step in the design process to assess the new stem's potential. Several measuring systems, linear variable displacement transducer-based and other, require assuming bone or implant to be rigid to obtain micromotion values or to calculate derived quantities such as relative implant tilting. METHODS: An alternative linear variable displacement transducer-based measuring system not requiring a rigid body assumption was developed in this study...
January 16, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28110242/three-dimensional-analysis-of-tarsal-bone-response-to-axial-loading-in-patients-with-hallux-valgus-and-normal-feet
#2
Kota Watanabe, Yasutoshi Ikeda, Daisuke Suzuki, Atsushi Teramoto, Takuma Kobayashi, Tomoyuki Suzuki, Toshihiko Yamashita
BACKGROUND: Patients with hallux valgus present a variety of symptoms that may be related to the type of deformity. Weightbearing affects the deformities, and the evaluation of the load response of tarsal bones has been mainly performed using two-dimensional plane radiography. The purpose of this study was to investigate and compare structural changes in the medial foot arch between patients with hallux valgus and normal controls using a computer image analysis technique and weightbearing computed tomography data...
January 17, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28110146/enhanced-arm-swing-alters-interlimb-coordination-during-overground-walking-in-individuals-with-traumatic-brain-injury
#3
Ksenia I Ustinova, Joseph E Langenderfer, Nilanthy Balendra
The current study investigated interlimb coordination in individuals with traumatic brain injury (TBI) during overground walking. The study involved 10 participants with coordination, balance, and gait abnormalities post-TBI, as well as 10 sex- and age-matched healthy control individuals. Participants walked 12m under two experimental conditions: 1) at self-selected comfortable walking speeds; and 2) with instructions to increase the amplitude and out-of-phase coordination of arm swinging. The gait was assessed with a set of spatiotemporal and kinematic parameters including the gait velocity, step length and width, double support time, lateral displacement of the center of mass, the amplitude of horizontal trunk rotation, and angular motions at shoulder and hip joints in sagittal plane...
January 19, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28110129/identifying-and-overcoming-the-effect-of-mass-transfer-limitation-on-decreased-yield-in-enzymatic-hydrolysis-of-lignocellulose-at-high-solid-concentrations
#4
Jian Du, Yuan Cao, Guodong Liu, Jian Zhao, Xuezhi Li, Yinbo Qu
Cellulose conversion decreases significantly with increasing solid concentrations during enzymatic hydrolysis of insoluble lignocellulosic materials. Here, mass transfer limitation was identified as a significant determining factor of this decrease by studying the hydrolysis of delignified corncob residue in shake flask, the most used reaction vessel in bench scale. Two mass transfer efficiency-related factors, mixing speed and flask filling, were shown to correlate closely with cellulose conversion at solid loadings higher than 15% DM...
January 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28109689/-intensity-of-interprofessional-collaboration-among-intensive-care-nurses-at-a-tertiary-hospital
#5
G Serrano-Gemes, M Rich-Ruiz
OBJECTIVES: To measure the intensity of interprofessional collaboration (IPC) in nurses of an intensive care unit (ICU) at a tertiary hospital, to check differences between the dimensions of the Intensity of Interprofessional Collaboration Questionnaire, and to identify the influence of personal variables. METHOD: A cross-sectional descriptive study was conducted with 63 intensive care nurses selected by simple random sampling. Explanatory variables: age, sex, years of experience in nursing, years of experience in critical care, workday type and work shift type; variable of outcome: IPC...
January 18, 2017: Enfermería Intensiva
https://www.readbyqxmd.com/read/28109672/optimizing-follow-up-after-anatomic-total-shoulder-arthroplasty
#6
Bradley Schoch, Jean David Werthel, Cathy D Schleck, William S Harmsen, John Sperling, Joaquín Sánchez-Sotelo, Robert H Cofield
BACKGROUND: With increases in both total shoulder arthroplasty (TSA) volumes and patient life expectancies, the number of patients requiring follow-up after shoulder arthroplasty continues to grow exponentially. The purpose of this study is to establish a data-based follow-up schedule minimizing unnecessary patient and health care system costs without sacrificing patient care. METHODS: Between January 1975 and January 2013, 2786 consecutive anatomic TSAs were performed at our institution...
January 19, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28109485/ampleness-of-head-movements-of-children-and-adolescents-with-sensorineural-hearing-loss
#7
Renato de Souza Melo
INTRODUCTION: Head movements are controlled by the vestibular system. Children with sensorineural hearing loss can present restrictions in ampleness of head movements due to damage in the vestibule-cochlear systems, resulting from injury in the inner ear. OBJECTIVE: To evaluate the ampleness of head movements of children with normal hearing and children with sensorineural hearing loss and compare data between groups. METHODS: Cross-sectional study that evaluated the ampleness of head movements of 96 students, being 48 with normal hearing and 48 with sensorineural hearing loss, of both sexes, with aged between 7 and 18 years old...
February 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28108482/inhibition-of-prolyl-4-hydroxylase-decreases-muscle-fibrosis-following-chronic-rotator-cuff-tear
#8
J P Gumucio, M D Flood, A Bedi, H F Kramer, A J Russell, C L Mendias
OBJECTIVES: Rotator cuff tears are among the most frequent upper extremity injuries. Current treatment strategies do not address the poor quality of the muscle and tendon following chronic rotator cuff tears. Hypoxia-inducible factor-1 alpha (HIF-1α) is a transcription factor that activates many genes that are important in skeletal muscle regeneration. HIF-1α is inhibited under normal physiological conditions by the HIF prolyl 4-hydroxylases (PHDs). In this study, we used a pharmacological PHD inhibitor, GSK1120360A, to enhance the activity of HIF-1α following the repair of a chronic cuff tear, and measured muscle fibre contractility, fibrosis, gene expression, and enthesis mechanics...
January 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28108399/fine-structure-of-the-anterior-median-eyes-of-the-funnel-web-spider-agelena-labyrinthica-araneae-agelenidae
#9
Wolfgang-D Schröer
Only few electron microscopic studies exist on the structure of the main eyes (anterior median eyes, AME) of web spiders. The present paper provides details on the anatomy of the AME in the funnel-web spider Agelena labyrinthica. The retina consists of two separate regions with differently arranged photoreceptor cells. Its central part has sensory cells with rhabdomeres on 2, 3, or 4 sides, whereas those of the ventral retina have only two rhabdomeres on opposite sides. In addition, the rhabdomeres of the ventral retina are arranged in a specific way: Whereas in the most ventral part they form long tangential rows, those towards the center are detached and are arranged radially...
January 17, 2017: Arthropod Structure & Development
https://www.readbyqxmd.com/read/28108327/structurally-diverse-secondary-metabolites-from-a-deep-sea-derived-fungus-penicillium-chrysogenum-scsio-41001-and-their-biological-evaluation
#10
Shengtian Chen, Junfeng Wang, Zhen Wang, Xiuping Lin, Bingxin Zhao, Kumaravel Kaliaperumal, Xiaojian Liao, Zhengchao Tu, Jianlin Li, Shihai Xu, Yonghong Liu
Five new compounds, including a cytotoxic dimeric isocoumarin, bipenicilisorin (1), a merosesquiterpenoid, yaminterritrem C (2), a citrinin dimer, penicitrinone F (3), a alkaloid, terremide D (4), and a δ-valerolacton, (E)-4-(propen-1-yl)-5,6-dihydro-2H-pyran-2-one (5), along with ten known compounds (6-15) were isolated from a deep-sea-derived fungus Penicillium chrysogenum SCSIO 41001. Their structures and absolute configurations were elucidated by NMR spectra, MS, CD, optical rotation, X-ray crystallography, and compared with literature data...
January 17, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28108173/broach-handle-design-changes-force-distribution-in-the-femur-during-total-hip-arthroplasty
#11
Dustin A Greenhill, Pooyan Abbasi, Kurosh Darvish, Andrew M Star
BACKGROUND: Curved broach handles were developed to overcome limited surgical exposures during total hip arthroplasty. Some authors report increased intraoperative fracture rates during limited exposures. This study evaluates mechanical force ratios transmitted to the bone while broaching with curved vs straight handles. METHODS: An experimental model utilized a 6-axis load cell to measure force distributions produced by 4 different broach handles, each with increasing offset and curvature...
December 29, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28108017/influence-of-kinematics-on-the-wear-of-a-total-ankle-replacement
#12
Alexandra Smyth, John Fisher, Silvia Suñer, Claire Brockett
Total ankle replacement (TAR) is an alternative to fusion, replacing the degenerated joint with a mechanical motion-preserving alternative. Minimal pre-clinical testing has been reported to date and existing wear testing standards lack definition. Ankle gait is complex, therefore the aim of this study was to investigate the effect on wear of a range of different ankle gait kinematic inputs. Five Zenith (Corin Group) TARs were tested in a modified knee simulator for twelve million cycles (Mc). Different combinations of IR rotation and AP displacement were applied every 2Mc to understand the effects of the individual kinematics...
January 8, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28107928/determination-of-d-lactide-content-in-lactide-stereoisomeric-mixture-using-gas-chromatography-polarimetry
#13
Lidong Feng, Xinchao Bian, Zhiming Chen, Sheng Xiang, Yanlong Liu, Bin Sun, Gao Li, Xuesi Chen
An analytical method has been proposed to quantify the D-lactide content in a lactide stereoisomeric mixture using combined gas chromatography and polarimetry (GC- polarimetry). As for a lactide stereoisomeric mixture, meso-lactide can be determined quantitatively using GC, but D- and L-lactides cannot be separated by the given GC system. The composition of a lactide stereoisomeric mixture is directly relative to its specific optical rotation. The specific optical rotations of neat L-lactide were obtained in different solutions, which were -266...
March 1, 2017: Talanta
https://www.readbyqxmd.com/read/28107632/structural-changes-in-acetophenone-fluid-films-as-a-function-of-nano-scale-thickness
#14
Samantha L Nania, Scott K Shaw
We report experimental observations of a developing fluid-solid interface by examining acetophenone films of varying thicknesses, supported on solid silver substrates. A dynamic wetting technique provides experimental control of fluid film thickness as a function of rotational velocity. Ellipsometry and infrared reflection absorption spectroscopy data are analyzed to provide absolute film thickness and details of the changing chemical environment for varying film thickness. This data is compared to theoretical models that predict fluid film thicknesses based on physical-chemical properties of the acetophenone/silver pair...
January 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28107242/an-in-vitro-biomechanical-study-evaluating-cervical-extension-plates-for-stabilizing-degenerated-adjacent-levels
#15
Kamran Majid, Mark Moldavsky, Saif Khalil, Manasa Gudipally
STUDY DESIGN: To evaluate the biomechanical stability of 2 extender plates in a human cervical cadaveric model. OBJECTIVES: To evaluate 2 extender plates, placed adjacent to initially implanted plates and to compare their biomechanical stability with traditional techniques. SUMMARY OF BACKGROUND DATA: Traditionally, adjacent level degeneration is surgically treated by removing the previously implanted plate and extending the instrumentation to the new degenerated level...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28107235/an-experimental-biomechanical-study-on-artificial-atlantoodontoid-joint-replacement-in-dogs
#16
Quanjin Zang, Yanming Liu, Dengfeng Wang, Haopeng Li, Pinglin Yang, Dong Wang, Xijing He
STUDY DESIGN: This study tested the biomechanics of artificial atlantoodontoid joint replacement (AAOJR) in a dog model. Dogs were divided into the artificial AAOJR group (n=10), the decompression group (n=10), and the healthy control group (n=10) using a random number table. OBJECTIVE: To evaluate whether the use of AAOJR for repair of atlantoaxial instability retains rotation and restores stability. SUMMARY OF BACKGROUND DATA: Atlantoaxial instability is characterized by excessive movement or laxity at the junction between the atlas (C1) and axis (C2)...
February 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28107113/the-relationship-between-pitching-mechanics-and-injury
#17
Peter N Chalmers, Markus A Wimmer, Nikhil N Verma, Brian J Cole, Anthony A Romeo, Gregory L Cvetanovich, Michael L Pearl
CONTEXT: The overhand pitch is one of the fastest known human motions and places enormous forces and torques on the upper extremity. Shoulder and elbow pain and injury are common in high-level pitchers. A large body of research has been conducted to understand the pitching motion. EVIDENCE ACQUISITION: A comprehensive review of the literature was performed to gain a full understanding of all currently available biomechanical and clinical evidence surrounding pitching motion analysis...
January 1, 2017: Sports Health
https://www.readbyqxmd.com/read/28107042/association-between-depressive-symptoms-and-morningness-eveningness-sleep-duration-and-rotating-shift-work-in-japanese-nurses
#18
Fumiharu Togo, Takahiro Yoshizaki, Taiki Komatsu
Higher depressive symptoms have been reported in rotating shift workers compared with day workers. Depressive symptoms in adults who do not engage in night work have also been shown to be associated with chronotype and sleep duration. This study examines associations between depressive symptoms, morningness-eveningness (i.e. the degree to which people prefer to be active in the morning or the evening), sleep duration and rotating shift work. Japanese nurses (1252 day workers and 1780 rotating shift workers, aged 20-59) were studied using a self-administered questionnaire...
January 20, 2017: Chronobiology International
https://www.readbyqxmd.com/read/28106998/identification-of-cyclic-depsipeptides-and-their-dedicated-synthetase-from-hapsidospora-irregularis
#19
Shuwei Zhang, Yixing Qiu, Thomas B Kakule, Zhenyu Lu, Fuchao Xu, John G Lamb, Christopher A Reilly, Yong Zheng, Shing Wo Simon Sham, Wei Wang, Lijiang Xuan, Eric W Schmidt, Jixun Zhan
Seven cyclic depsipeptides were isolated from Hapsidospora irregularis and structurally characterized as the calcium channel blocker leualacin and six new analogues based on the NMR and HRESIMS data. These new compounds were named leualacins B-G. The absolute configurations of the amino acids and 2-hydroxyisocaproic acids were determined by recording the optical rotation values. Biological studies showed that calcium influx elicited by leualacin F in primary human lobar bronchial epithelial cells involves the TRPA1 channel...
January 20, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28106978/variations-of-polymer-porous-surface-structures-via-the-time-sequenced-dosing-of-mixed-solvents
#20
Erik Wrzecionko, Antonín Minařík, Petr Smolka, Martin Minařík, Petr Humpolíček, Petra Rejmontová, Aleš Mráček, Magda Minaříková, Lenka Gřundělová
A new approach to polystyrene surface treatment via the time-sequenced dispensing of a good / poor solvent mixture on the rotating surface of treated substrate is presented in this study. It is demonstrated that the variation of the sequencing, together with other variables (e.g., temperature and solvent concentration), affects the size and depth of pores evolving on the polystyrene surface. A model of the surface pore creation, associated with the viscoelastic phase separation, surface tension and secondary flows caused by temperature variations and the rapid evaporation of the good solvent is proposed...
January 20, 2017: ACS Applied Materials & Interfaces
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