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https://www.readbyqxmd.com/read/28744040/an-estimation-of-knee-and-ankle-joint-angles-during-extension-phase-of-standing-up-motion-performed-using-an-inertial-sensor
#1
Fang Jin, Takayuki Nagasaki, Chikamune Wada
[Purpose] Motion capture system is difficult to use in daily life. The aim of this study was to propose an estimation model for knee and ankle joint angle measurements and locate body center of gravity (COG) of the extension phase during standing-up motion. [Subjects and Methods] Seven healthy male volunteers were enrolled. An estimation model was proposed for the knee and ankle joint angle measurements by combining the angle and acceleration of the trunk, based on readings from the inertial sensor attachment on the subject's chest, during the extension phase...
July 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28730921/kinematic-repeatability-of-a-multi-segment-foot-model-for-dance
#2
Sarah L Carter, Nahoko Sato, Luke S Hopper
The purpose of this study was to determine the intra and inter-assessor repeatability of a modified Rizzoli Foot Model for analysing the foot kinematics of ballet dancers. Six university-level ballet dancers performed the movements; parallel stance, turnout plié, turnout stance, turnout rise and flex-point-flex. The three-dimensional (3D) position of individual reflective markers and marker triads was used to model the movement of the dancers' tibia, entire foot, hindfoot, midfoot, forefoot and hallux. Intra and inter-assessor reliability demonstrated excellent (ICC ≥ 0...
July 21, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28726074/error-performances-of-a-model-based-biplane-fluoroscopic-system-for-tracking-knee-prosthesis-during-treadmill-gait-task
#3
Arnaud Barré, Kamiar Aminian
Roentgen stereophotogrammetry analysis technique allows an accurate measurement of knee joint prosthesis position and orientation using two X-ray images. Although this technique is used generally during static procedure, it is possible to use it with a biplane fluoroscopic system to measure the prosthesis kinematics during functional tasks (e.g., gait, squat, jump) performed in a laboratory environment. However, the performance of the system in terms of errors for the measurements and the model-based matching algorithm are not well known for dynamic tasks such as walking...
July 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28712529/dynamic-simulation-of-knee-joint-loading-during-gait-using-force-feedback-control-and-surrogate-contact-modelling
#4
Jonathan P Walter, Marcus G Pandy
The aim of this study was to perform multi-body, muscle-driven, forward-dynamics simulations of human gait using a 6-degree-of-freedom (6-DOF) model of the knee in tandem with a surrogate model of articular contact and force control. A forward-dynamics simulation incorporating position, velocity and contact force-feedback control (FFC) was used to track full-body motion capture data recorded for multiple trials of level walking and stair descent performed by two individuals with instrumented knee implants. Tibiofemoral contact force errors for FFC were compared against those obtained from a standard computed muscle control algorithm (CMC) with a 6-DOF knee contact model (CMC6); CMC with a 1-DOF translating hinge-knee model (CMC1); and static optimization with a 1-DOF translating hinge-knee model (SO)...
July 13, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28711665/ancient-mitochondrial-pseudogenes-reveal-hybridization-between-distant-lineages-in-the-evolution-of-the-rupicapra-genus
#5
T Pérez, F Rodríguez, M Fernández, J Albornoz, A Domínguez
Mitochondrial pseudogenes (numts) inserted in the nuclear genome are frequently found in population studies. Its presence is commonly connected with problems and errors when they are confounded with true mitochondrial sequences. In the opposite side, numts can provide valuable phylogenetic information when they are copies of ancient mitochondrial lineages. We show that Rupicapra individuals of different geographic origin from the Cantabrian Mountains to the Apennines and the Caucasus share a nuclear COI fragment...
July 12, 2017: Gene
https://www.readbyqxmd.com/read/28684556/sacroiliac-radiographic-progression-in-recent-onset-axial-spondyloarthritis-the-5-year-data-of-the-desir-cohort
#6
Maxime Dougados, Alexandre Sepriano, Anna Molto, Miranda van Lunteren, Sofia Ramiro, Manouk de Hooge, Rosaline van den Berg, Victoria Navarro Compan, Christophe Demattei, Robert Landewé, Désirée van der Heijde
OBJECTIVE: To estimate sacroiliac joint radiographic (X-SIJ) progression in patients with axial spondyloarthritis (axSpA) and to evaluate the effects of inflammation on MRI (MRI-SIJ) on X-SIJ progression. METHODS: X-SIJ and MRI-SIJ at baseline and after 2 and 5 years in patients with recent onset axSpA from the DESIR cohort were scored by three central readers. Progression was defined as (1) the shift from non-radiographic (nr) to radiographic (r) sacroiliitis (by modified New York (mNY) criteria) or alternative criteria, (2) a change of at least one grade or (3) a change of at least one grade but ignoring a change from grade 0 to 1...
July 6, 2017: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/28676750/multi-trial-gait-adaptation-of-healthy-individuals-during-visual-kinematic-perturbations
#7
Trieu Phat Luu, Yongtian He, Sho Nakagome, Kevin Nathan, Samuel Brown, Jeffrey Gorges, Jose L Contreras-Vidal
Optimizing rehabilitation strategies requires understanding the effects of contextual cues on adaptation learning. Prior studies have examined these effects on the specificity of split-belt walking adaptation, showing that contextual visual cues can be manipulated to modulate the magnitude, transfer, and washout of split-belt-induced learning in humans. Specifically, manipulating the availability of vision during training or testing phases of learning resulted in differences in adaptive mechanisms for temporal and spatial features of walking...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28669547/the-effects-of-wrist-motion-and-hand-orientation-on-muscle-forces-a-physiologic-wrist-simulator-study
#8
Darshan S Shah, Claire Middleton, Sabahat Gurdezi, Maxim D Horwitz, Angela E Kedgley
Although the orientations of the hand and forearm vary for different wrist rehabilitation protocols, their effect on muscle forces has not been quantified. Physiologic simulators enable a biomechanical evaluation of the joint by recreating functional motions in cadaveric specimens. Control strategies used to actuate joints in physiologic simulators usually employ position or force feedback alone to achieve optimum load distribution across the muscles. After successful tests on a phantom limb, unique combinations of position and force feedback - hybrid control and cascade control - were used to simulate multiple cyclic wrist motions of flexion-extension, radioulnar deviation, dart thrower's motion, and circumduction using six muscles in ten cadaveric specimens...
June 21, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28663499/decoding-of-position-in-the-developing-neural-tube-from-antiparallel-morphogen-gradients
#9
Marcin Zagorski, Yoji Tabata, Nathalie Brandenberg, Matthias P Lutolf, Gašper Tkačik, Tobias Bollenbach, James Briscoe, Anna Kicheva
Like many developing tissues, the vertebrate neural tube is patterned by antiparallel morphogen gradients. To understand how these inputs are interpreted, we measured morphogen signaling and target gene expression in mouse embryos and chick ex vivo assays. From these data, we derived and validated a characteristic decoding map that relates morphogen input to the positional identity of neural progenitors. Analysis of the observed responses indicates that the underlying interpretation strategy minimizes patterning errors in response to the joint input of noisy opposing gradients...
June 30, 2017: Science
https://www.readbyqxmd.com/read/28651855/assessment-of-pose-repeatability-and-specimen-repositioning-of-a-robotic-joint-testing-platform
#10
H El Daou, B Lord, A Amis, F Rodriguez Y Baena
This paper describes the quantitative assessment of a robotic testing platform, consisting of an industrial robot and a universal force-moment sensor, via the design of fixtures used to hold the tibia and femur of cadaveric knees. This platform was used to study the contributions of different soft tissues and the ability of implants and reconstruction surgeries to restore normal joint functions, in previously published literature. To compare different conditions of human joints, it is essential to reposition specimens with high precision after they have been removed for a surgical procedure...
June 23, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28638243/subacromial-anesthetics-increase-proprioceptive-deficit-in-the-shoulder-and-elbow-in-patients-with-subacromial-impingement-syndrome
#11
Lucas R Ettinger, Matthew Shapiro, Andrew Karduna
Shoulder proprioception gives information regarding arm joint position and movement direction. Several studies have investigated shoulder proprioceptive acuity in patients with subacromial impingement syndrome (SIS); however, differences in protocols and between-subjects designs have limited scientific inferences regarding proprioception and SIS. We aimed to determine within-subject differences in shoulder and elbow proprioceptive acuity in 17 patients with stage 2 SIS following treatment of a local anesthetic injection...
2017: Clinical Medicine Insights. Arthritis and Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28626305/inter-rater-and-intra-rater-reliability-of-the-fluid-goniometer-for-measuring-active-knee-flexion-in-painful-knees-correlations-do-not-mean-agreement
#12
Wilton Remigio, Nancy Tsai, Leonivic Layos, Michelle Chavez
[Purpose] The fluid goniometer is an instrument for measuring range of motion. Reliability of the fluid goniometer has not been established for subjects with painful knee joints. The purpose of this study was to determine the inter-rater and intra-rater reliability of the fluid goniometer in measuring active knee flexion of painful knees and to test its agreement with the gold standard ruler goniometer. [Subjects and Methods] Twenty-five individuals with either unilateral or bilateral painful knees participated in the study...
June 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28619447/similar-movements-are-associated-with-drastically-different-muscle-contraction-velocities
#13
Daniel A Hagen, Francisco J Valero-Cuevas
We investigated how kinematic redundancy interacts with the neurophysiological control mechanisms required for smooth and accurate, rapid limb movements. Biomechanically speaking, tendon excursions are over-determined because the rotation of few joints determines the lengths and velocities of many muscles. But how different are the muscle velocity profiles induced by various, equally valid hand trajectories? We used an 18-muscle sagittal-plane arm model to calculate 100,000 feasible shoulder, elbow, and wrist joint rotations that produced valid basketball free throws with different hand trajectories, but identical initial and final hand positions and velocities...
July 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28605314/the-validity-and-reliability-of-knee-proprioception-measurement-performed-with-inclinometer-in-different-positions
#14
Sinem Suner-Keklik, Gamze Cobanoglu-Seven, Nihan Kafa, Mustafa Ugurlu, Nevin Atalay Guzel
CONTEXT: Proprioception is the basic element of the spontaneous control of movement, balance and joint stability. Therefore, it is necessary for the execution of walking and daily and sport activities. Loss of proprioception of the knee, which may cause a new injury, is important to evaluate the position sense of the joint during the rehabilitation period. However, the evaluation methods that are used are very expensive, complicated and non-portable, or the measuring method is difficult to implement...
June 12, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/28592552/colistin-and-polymyxin-b-susceptibility-testing-for-carbapenem-resistant-and-mcr-positive-enterobacteriaceae-comparison-of-sensititre-microscan-vitek-2-and-etest-with-broth-microdilution
#15
Ka Lip Chew, My-Van La, Raymond T P Lin, Jeanette W P Teo
Colistin and polymyxin B remain part of the last line of antibiotics for multi-drug-resistant Gram negative bacteria such as carbapenem-resistant-Enterobacteriaceae Current EUCAST-CLSI joint recommendations are for broth microdilution to be performed for MIC testing of colistin. Commercial susceptibility testing methods were evaluated and compared against reference broth microdilution (BMD), using a susceptible breakpoint of ≤2mg/L for both colistin and polymyxin B. Seventy-six Enterobacteriaceae were included, of which twenty-one were mcr-1 positive...
June 7, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28590562/robust-epi-nyquist-ghost-removal-by-incorporating-phase-error-correction-with-sensitivity-encoding-pec-sense
#16
Victor B Xie, Mengye Lyu, Yilong Liu, Yanqiu Feng, Ed X Wu
PURPOSE: The existing approach of Nyquist ghost correction by parallel imaging in echo planar imaging (EPI) can suffer from image noise amplification. We propose a method that estimates a phase error map from multi-channel data itself and incorporates it into the sensitivity encoding (SENSE) reconstruction for Nyquist ghost correction without compromising the image SNR. METHODS: This method first reconstructs two ghost-free images from positive and negative echoes using SENSE, respectively, from which the phase error map is computed...
June 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28590154/practice-parameters-facilitating-adoption-of-advanced-technologies-for-enhancing-neuropsychological-assessment-paradigms
#17
Thomas D Parsons, Timothy McMahan, Robert Kane
OBJECTIVE: Clinical neuropsychologists have long underutilized computer technologies for neuropsychological assessment. Given the rapid advances in technology (e.g. virtual reality; tablets; iPhones) and the increased accessibility in the past decade, there is an on-going need to identify optimal specifications for advanced technologies while minimizing potential sources of error. Herein, we discuss concerns raised by a joint American Academy of Clinical Neuropsychology/National Academy of Neuropsychology position paper...
June 7, 2017: Clinical Neuropsychologist
https://www.readbyqxmd.com/read/28573974/lower-limb-estimation-from-sparse-landmarks-using-an-articulated-shape-model
#18
Ju Zhang, Justin Fernandez, Jacqui Hislop-Jambrich, Thor F Besier
Rapid generation of lower limb musculoskeletal models is essential for clinically applicable patient-specific gait modeling. Estimation of muscle and joint contact forces requires accurate representation of bone geometry and pose, as well as their muscle attachment sites, which define muscle moment arms. Motion-capture is a routine part of gait assessment but contains relatively sparse geometric information. Standard methods for creating customized models from motion-capture data scale a reference model without considering natural shape variations...
December 8, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/28558447/physical-characteristics-associated-with-neck-pain-and-injury-in-rugby-union-players
#19
Suzanne J Snodgrass, Peter G Osmotherly, Susan A Reid, Peter D Milburn, Darren A Rivett
BACKGROUND: Neck pain and injury are common in rugby union. Physical characteristics predisposing players to neck injury are largely unknown. This study aimed to determine physical characteristics associated with neck pain and injury in rugby union players. METHODS: Semi-professional rugby union players (n=142) underwent pre-season measurements including cervical active range of motion (AROM), strength, sensorimotor proprioception (joint position error), and anthropometry...
May 30, 2017: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/28554245/a-device-for-testing-the-dynamic-performance-of-in-situ-force-plates
#20
Rebecca H East, Jonathan J Noble, Richard A Arscott, Adam P Shortland
Force plates are often incorporated into motion capture systems for the calculation of joint kinetic variables and other data. This project aimed to create a system that could be used to check the dynamic performance of force plate in situ. The proposed solution involved the design and development of an eccentrically loaded wheel mounted on a weighted frame. The frame was designed to hold a wheel mounted in two orthogonal positions. The wheel was placed on the force plate and spun. A VICON™ motion analysis system captured the positional data of the markers placed around the rim of the wheel which was used to create a simulated force profile, and the force profile was dependent on spin speed...
May 1, 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
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