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Gait Components

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https://www.readbyqxmd.com/read/30112983/upper-body-accelerations-during-level-walking-in-transtibial-amputees
#1
Francesco Paradisi, Eugenio Di Stanislao, Aurora Summa, Stefano Brunelli, M Traballesi, Giuseppe Vannozzi
BACKGROUND: The observation of upper body movement is gaining interest in the gait analysis community. Recent studies involved the use of body-worn motion sensors, allowing translation of laboratory measurements to real-life settings in the context of patient monitoring and fall prevention. OBJECTIVES: It was shown that amputee persons demonstrate altered acceleration patterns due to the presence of prosthetic components, while no information is available on how accelerations propagate upwards to the head during level walking...
August 16, 2018: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/30111337/validation-of-wearable-visual-feedback-for-retraining-foot-progression-angle-using-inertial-sensors-and-an-augmented-reality-headset
#2
Angelos Karatsidis, Rosie E Richards, Jason M Konrath, Josien C van den Noort, H Martin Schepers, Giovanni Bellusci, Jaap Harlaar, Peter H Veltink
BACKGROUND: Gait retraining interventions using real-time biofeedback have been proposed to alter the loading across the knee joint in patients with knee osteoarthritis. Despite the demonstrated benefits of these conservative treatments, their clinical adoption is currently obstructed by the high complexity, spatial demands, and cost of optical motion capture systems. In this study we propose and evaluate a wearable visual feedback system for gait retraining of the foot progression angle (FPA)...
August 15, 2018: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/30108511/exergaming-in-a-moving-virtual-world-to-train-vestibular-functions-and-gait-a-proof-of-concept-study-with-older-adults
#3
Jaap Swanenburg, Karin Wild, Dominik Straumann, Eling D de Bruin
Background: The use of Exergames designed to improve physical and cognitive functioning is relatively new in rehabilitation. Exergaming allows the training of skills, the handling of tools, and procedures; however, often, the potential of these aspects are not assessed before they are adopted in clinical settings. This study aimed at exploring the effects of exergaming on vestibular functions and gait in healthy community dwelling older adults using a proof-of-concept study design registered under ClinicalTrials...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/30096585/association-between-gait-and-cognition-in-an-elderly-population-based-sample
#4
Vyara Valkanova, Patrick Esser, Naiara Demnitz, Claire E Sexton, Enikő Zsoldos, Abda Mahmood, Ludovica Griffanti, Mika Kivimäki, Archana Singh-Manoux, Helen Dawes, Klaus P Ebmeier
BACKGROUND: Gait is thought to have a cognitive component, but the current evidence in healthy elderly is mixed. We studied the association between multiple gait and cognitive measures in a cohort of older people. METHODS: One hundred and seventy-eight cognitively healthy participants from the Whitehall II Imaging Sub-study had a detailed clinical and neuropsychological assessment, as well as an MRI scan. Spatiotemporal and variability gait measures were derived from two 10 m walks at self-selected speed...
July 29, 2018: Gait & Posture
https://www.readbyqxmd.com/read/30090061/modular-neural-mechanisms-for-gait-phase-tracking-prediction-and-selection-in-personalizable-knee-ankle-foot-orthoses
#5
Jan-Matthias Braun, Florentin Wörgötter, Poramate Manoonpong
Orthoses for the lower limbs support patients to perform movements that they could not perform on their own. In traditional devices, generic gait models for a limited set of supported movements restrict the patients mobility and device acceptance. To overcome such limitations, we propose a modular neural control approach with user feedback for personalizable Knee-Ankle-Foot-Orthoses (KAFO). The modular controller consists of two main neural components: neural orthosis control for gait phase tracking and neural internal models for gait prediction and selection...
2018: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/30086670/a-dual-learning-paradigm-simultaneously-improves-multiple-features-of-gait-post-stroke
#6
Kendra M Cherry-Allen, Matthew A Statton, Pablo A Celnik, Amy J Bastian
BACKGROUND: Gait impairments after stroke arise from dysfunction of one or several features of the walking pattern. Traditional rehabilitation practice focuses on improving one component at a time, which may leave certain features unaddressed or prolong rehabilitation time. Recent work shows that neurologically intact adults can learn multiple movement components simultaneously. OBJECTIVE: To determine whether a dual-learning paradigm, incorporating 2 distinct motor tasks, can simultaneously improve 2 impaired components of the gait pattern in people posttroke...
August 7, 2018: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/30085235/low-testosterone-is-associated-with-frailty-muscle-wasting-and-physical-dysfunction-among-men-receiving-hemodialysis-a-longitudinal-analysis
#7
Janet M Chiang, George A Kaysen, Mark Segal, Glenn M Chertow, Cynthia Delgado, Kirsten L Johansen
Background: Despite the high prevalence of frailty among patients receiving hemodialysis, few preventable or treatable contributing causes have been identified. Hypogonadism is also common in this population and low serum testosterone concentrations share several clinical phenotypes with frailty. We hypothesized that low serum testosterone concentrations would be associated with frailty and several of its individual components. Methods: We used data from 440 men from A Cohort Study To Investigate the Value of Exercise in ESRD/Analysis Designed to Investigate the Paradox of Obesity and Survival in ESRD, a longitudinal study that recruited participants from 14 dialysis centers in Atlanta, GA and the San Francisco, CA Bay Area from 2009 to 2011...
August 1, 2018: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/30067106/cognitive-load-reduces-the-effects-of-optic-flow-on-gait-and-electrocortical-dynamics-during-treadmill-walking
#8
Brenda R Malcolm, John J Foxe, John S Butler, Sophie Molholm, Pierfilippo De Sanctis
While navigating complex environments the brain must continuously adapt to both external demands such as fluctuating sensory inputs, as well as internal demands, such as engagement in a cognitively demanding task. Previous studies have demonstrated changes in behavior and gait with increased sensory and cognitive load, but the underlying cortical mechanisms remain largely unknown. Here, in a Mobile Brain/Body Imaging (MoBI) approach sixteen young adults walked on a treadmill with high-density EEG while 3D motion capture tracked kinematics of the head and feet...
August 1, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/30055821/documented-systematic-and-individualized-communication-with-the-attending-physician-for-fall-risk-reduction-injury-mitigation-care-planning
#9
David A Smith
Falls are common in nursing homes (NHs) and may result in serious injury to the resident as well as legal and regulatory liability for the NH. Some of these falls and injuries might be avoided if attending physicians were involved in risk reduction. I developed a communication tool to solicit from attending physicians specific risks for patients most likely to experience a fall and injury, and to consider strategies to reduce those risks. The communication tool addresses medications, osteopenia, vitamin D deficiency, vision, hearing, gait/balance/peripheral sensation, injury mitigation, altered mental status, restraints, and philosophy of treatment...
August 2018: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/30044676/shape-synthesis-of-an-assistive-knee-exoskeleton-device-to-support-knee-joint-and-rehabilitate-gait
#10
Ramanpreet Singh, Himanshu Chaudhary, Amit K Singh
PURPOSE: The assistive knee exoskeleton device is used for supporting the surrounding ligaments, tendons, and muscles of the injured knee joint. Various knee exoskeletons have been discussed; however, their shape synthesis is not reported. This study aims to present the shape synthesis of the assistive knee device. Moreover, four-bar linkage is used for the knee exoskeleton, in this study. METHODS: Clinical biomechanical data are adapted from gait database for one gait cycle...
July 25, 2018: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/30044409/development-of-a-novel-in-silico-model-to-investigate-the-influence-of-radial-clearance-on-the-acetabular-cup-contact-pressure-in-hip-implants
#11
Saverio Affatato, Massimiliano Merola, Alessandro Ruggiero
A hip joint replacement is considered one of the most successful orthopedic surgical procedures although it involves challenges that must be overcome. The patient group undergoing total hip arthroplasty now includes younger and more active patients who require a broad range of motion and a longer service lifetime of the implant. The current replacement joint results are not fully satisfactory for these patients' demands. As particle release is one of the main issues, pre-clinical experimental wear testing of total hip replacement components is an invaluable tool for evaluating new implant designs and materials...
July 25, 2018: Materials
https://www.readbyqxmd.com/read/30040765/vestibular-rehabilitation-training-in-patients-with-subacute-stroke-a-preliminary-randomized-controlled-tria
#12
Marco Tramontano, Elena Bergamini, Marco Iosa, Valeria Belluscio, Giuseppe Vannozzi, Giovanni Morone
BACKGROUND: Vestibular rehabilitation (VR) consists in a customized exercise program patient-centred that includes a combination of different exercise components with the aim to promote gaze stability, improve balance and gait, and facilitate somatosensory integration. OBJECTIVE: The aim of this study was to investigate the effect of customized vestibular rehabilitation training on gait stability of patients with subacute stroke. METHODS: Twenty-five inpatients (12 M, age: 64...
July 16, 2018: NeuroRehabilitation
https://www.readbyqxmd.com/read/30037578/in-vivo-3-dimensional-gait-symmetry-analysis-in-patients-with-bilateral-total-hip-arthroplasty
#13
Paul Arauz, Yun Peng, John MacAuliffe, Young-Min Kwon
Although three-dimensional (3D) asymmetry has been reported in unilateral THA patients during gait, it is not well understood whether asymmetric hip kinematics during gait persist in bilaterally operated THA patients. The purpose of this study was to compare the in vivo 3D kinematics and component placement between bilateral and unilateral THA patients during gait. Eight bilateral and thirty-three unilateral THA patients were evaluated for both hips during treadmill gait using a validated combination of 3D computer tomography-based modeling and dual fluoroscopic imaging system (DFIS)...
August 22, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/30035328/in-vivo-sliding-distance-on-the-metal-on-polyethylene-total-hip-arthroplasty-articulation-using-patient-specific-gait-analysis
#14
Yun Peng, Paul Arauz, Shuai An, Young-Min Kwon
Metal-on-polyethylene (MoP) is the most commonly used bearing surface in primary total hip arthroplasty (THA). Polyethylene wear debris remains a major concern. Studies investigating the wear performance based on patient-specific in vivo kinematics and component orientation remains largely lacking. The primary goal of this study was to identify patterns of the distribution of sliding distance and cross-shear ratio among THA patients. A validated approach combining dual fluoroscopic imaging system and computed-tomography was utilized to quantify in vivo gait kinematics and component orientations in 48 total hips...
July 23, 2018: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/30030539/a-simple-model-of-mechanical-effects-to-estimate-metabolic-cost-of-human-walking
#15
Salman Faraji, Amy R Wu, Auke J Ijspeert
Since the advent of energy measurement devices, gait experiments have shown that energetic economy has a large influence on human walking behavior. However, few cost models have attempted to capture the major energy components under comprehensive walking conditions. Here we present a simple but unified model that uses walking mechanics to estimate metabolic cost at different speeds and step lengths and for six other biomechanically-relevant gait experiments in literature. This includes at various gait postures (e...
July 20, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30006236/validation-of-model-predicted-tibial-tray-synthetic-bone-relative-motion-in-cementless-total-knee-replacement-during-activities-of-daily-living
#16
Alessandro Navacchia, Chadd W Clary, Hayden L Wilson, Yashar A Behnam, Paul J Rullkoetter
As fixation of cementless total knee replacement components during the first 4-6 weeks after surgery is crucial to establish bony ingrowth into the porous surface, several studies have quantified implant-bone micromotion. Relative motion between the tray and bone can be measured in vitro, but the full micromotion contour map cannot typically be accessed experimentally. Finite element models have been employed to estimate the full micromotion map, but have not been directly validated over a range of loading conditions...
August 22, 2018: Journal of Biomechanics
https://www.readbyqxmd.com/read/30004297/contribution-of-passive-actions-to-the-lower-limb-joint-moments-and-powers-during-gait-a-comparison-of-models
#17
Xavier Gasparutto, Eric Jacquelin, Raphael Dumas
The lower limb passive actions representing the actions of all the passive periarticular structures have been shown to have a significant contribution to the power generation and absorption during gait. However, the respective magnitude of its different components was not established, although models of ligament moment were implemented in some musculoskeletal models. These ligament moments have shown to have an influence on the musculo-tendon forces and contact forces but the models used were never specifically evaluated, that is, compared to the passive and net joint moments...
July 1, 2018: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/29997373/a-semg-force-estimation-framework-based-on-a-fast-orthogonal-search-method-coupled-with-factorization-algorithms
#18
Xiang Chen, Yuan Yuan, Shuai Cao, Xu Zhang, Xun Chen
A novel framework based on the fast orthogonal search (FOS) method coupled with factorization algorithms was proposed and implemented to realize high-accuracy muscle force estimation via surface electromyogram (SEMG). During static isometric elbow flexion, high-density SEMG (HD-SEMG) signals were recorded from upper arm muscles, and the generated elbow force was measured at the wrist. HD-SEMG signals were decomposed into time-invariant activation patterns and time-varying activation curves using three typical factorization algorithms including principal component analysis (PCA), independent component analysis (ICA), and nonnegative matrix factorization (NMF)...
July 11, 2018: Sensors
https://www.readbyqxmd.com/read/29993408/movement-symmetry-assessment-by-bilateral-motion-data-fusion
#19
Peng Ren, Shiang Hu, Zhenfeng Han, Qing Wang, Shuxia Yao, Zhao Gao, Jiangming Jin, Maria L Bringas, Dezhong Yao, Bharat Biswal, Pedro A Valdes-Sosa
OBJECTIVE: A new approach, named bilateral motion data fusion, was proposed for the analysis of movement symmetry, which takes advantage of cross-information between both sides of the body and processes the unilateral motion data at the same time. METHODS: This was accomplished using canonical correlation analysis and joint independent component analysis. It should be noted that human movements include many categories, that cannot be enumerated one by one. Therefore, the gait rhythm fluctuations of the healthy subjects and patients with neurodegenerative diseases were employed as an example for method illustration...
April 24, 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29991994/asymmetric-hearing-loss-and-chronic-dizziness-in-a-patient-with-idiopathic-normal-pressure-hydrocephalus
#20
Theodoros Varakliotis, Federico Maspes, Vittoria Di Rubbo, Sara Cisternino, Maria Lauriello, Elisa Vitti, Alberto Eibenstein
We report a case of a 54-year old female patient, complaining for chronic dizziness, hearing loss, tension headaches without aura, postural instability and gait dysfunction. The patient referred having these symptoms from 1992, but the last few months she experienced a noticeable aggravation of the symptoms. A magnetic resonance imaging test revealed a triventricular hydrocephalus, not associated with signs of intracranial hypertension decompensation. The ENT-Audiology evaluation revealed a bilateral sensorineural hearing loss with a conductive component, video-nystagmography resulted in an areflexia of the right ear and a reduced vestibular activity for the left ear...
March 6, 2018: Audiology Research
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