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Inertial sensors

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https://www.readbyqxmd.com/read/28922015/over-the-top-acl-reconstruction-plus-extra-articular-lateral-tenodesis-with-hamstring-tendon-grafts-prospective-evaluation-with-20-year-minimum-follow-up
#1
Stefano Zaffagnini, Giulio Maria Marcheggiani Muccioli, Alberto Grassi, Tommaso Roberti di Sarsina, Federico Raggi, Cecilia Signorelli, Francisco Urrizola, Paolo Spinnato, Eugenio Rimondi, Maurilio Marcacci
BACKGROUND: There are few published studies with very long-term follow-up of combined intra- and extra-articular anterior cruciate ligament (ACL) reconstruction. PURPOSE: To analyze clinical and radiographic outcomes of over-the-top ACL reconstruction plus extra-articular lateral tenodesis with autologous hamstrings at minimum 20-year follow-up. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: Of 60 originally eligible patients who underwent over-the-top ACL reconstruction with double-stranded hamstring tendon (leaving intact graft tibial insertions) and extra-articular lateral plasty (performed with the remnant part of tendons), 52 were prospectively evaluated at a minimum 20-year follow-up (mean follow-up, 24 years; 41 men, 11 women; mean age at time of surgery, 25...
September 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28919877/analysis-of-correlation-between-an-accelerometer-based-algorithm-for-detecting-parkinsonian-gait-and-updrs-subscales
#2
Alejandro Rodríguez-Molinero, Albert Samà, Carlos Pérez-López, Daniel Rodríguez-Martín, Sheila Alcaine, Berta Mestre, Paola Quispe, Benedetta Giuliani, Gabriel Vainstein, Patrick Browne, Dean Sweeney, J Manuel Moreno Arostegui, Àngels Bayes, Hadas Lewy, Alberto Costa, Roberta Annicchiarico, Timothy Counihan, Gearòid Ò Laighin, Joan Cabestany
BACKGROUND: Our group earlier developed a small monitoring device, which uses accelerometer measurements to accurately detect motor fluctuations in patients with Parkinson's (On and Off state) based on an algorithm that characterizes gait through the frequency content of strides. To further validate the algorithm, we studied the correlation of its outputs with the motor section of the Unified Parkinson's Disease Rating Scale part-III (UPDRS-III). METHOD: Seventy-five patients suffering from Parkinson's disease were asked to walk both in the Off and the On state while wearing the inertial sensor on the waist...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28904136/neural-evidence-supports-a-dual-sensory-motor-role-for-insect-wings
#3
Brandon Pratt, Tanvi Deora, Thomas Mohren, Thomas Daniel
Flying insects use feedback from various sensory modalities including vision and mechanosensation to navigate through their environment. The rapid speed of mechanosensory information acquisition and processing compensates for the slower processing times associated with vision, particularly under low light conditions. While halteres in dipteran species are well known to provide such information for flight control, less is understood about the mechanosensory roles of their evolutionary antecedent, wings. The features that wing mechanosensory neurons (campaniform sensilla) encode remains relatively unexplored...
September 13, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28902805/the-effect-of-hearing-aids-and-cochlear-implants-on-balance-during-gait
#4
Tyler S Weaver, Corey S Shayman, Timothy E Hullar
HYPOTHESIS: Auditory input in people with hearing impairment will improve balance while walking. BACKGROUND: Auditory input is increasingly recognized as an additional input for balance. Several studies have found auditory cues to improve static balance measured on a sway platform. The effect of audition on gait, a dynamic task also linked to fall risk, has not been fully examined. If a positive effect were shown between audition and balance, it would further indicate that improving hearing could also improve balance...
October 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28895902/millimeter-scale-track-irregularity-surveying-based-on-zupt-aided-ins-with-sub-decimeter-scale-landmarks
#5
Qingan Jiang, Wenqi Wu, Yun Li, Mingming Jiang
Railway track irregularity surveying is important for the construction and the maintenance of railway lines. With the development of inertial devices, systems based on Inertial Navigation System (INS) have become feasible and popular approaches in track surveying applications. In order to overcome the requirement of high precision control points, this paper proposes a railway track irregularity measurement approach using the INS combined with the Zero Velocity Updates (ZUPT) technique and sub-decimeter scale landmarks...
September 12, 2017: Sensors
https://www.readbyqxmd.com/read/28895897/accuracy-of-base-of-support-using-an-inertial-sensor-based-motion-capture-system
#6
Liangjie Guo, Shuping Xiong
The potential of miniature inertial sensors for human balance and gait analysis appears promising. Base of support (BOS), together with its interaction with center of mass, is a critical indicator in above mentioned research fields. This study aims to evaluate the accuracy of Xsens MVN BIOMECH, a commercial widely used inertial sensor-based motion capture system, for measuring static BOS and examine the effect of different task complexity on the accuracy. Eleven young males participated in this study and went through eleven different experimental tasks...
September 12, 2017: Sensors
https://www.readbyqxmd.com/read/28894919/-timed-up-and-go-and-brain-atrophy-a-preliminary-mri-study-to-assess-functional-mobility-performance-in-multiple-sclerosis
#7
Lorena Lorefice, G Coghe, G Fenu, M Porta, G Pilloni, J Frau, F Corona, V Sechi, M A Barracciu, M G Marrosu, M Pau, E Cocco
Motor and cognitive disabilities are related to brain atrophy in multiple sclerosis (MS). 'Timed up and go' (TUG) has been recently tested in MS as functional mobility test, as it is able to evaluate ambulation/coordination-related tasks, as well as cognitive function related to mobility. The objective of this study is to evaluate the relationship between brain volumes and TUG performances. Inclusion criteria were a diagnosis of MS and the ability to walk at least 20 m. TUG was performed using a wearable inertial sensor...
September 11, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28894866/optimal-geometrical-design-of-inertial-vibration-dc-piezoelectric-nanogenerators-based-on-obliquely-aligned-inn-nanowire-arrays
#8
Nai-Jen Ku, Guocheng Liu, Chao-Hung Wang, Kapil Gupta, Wei-Shun Liao, Dayan Ban, Chuan-Pu Liu
Piezoelectric nanogenerators have been investigated to generate electricity from environmental vibrations due to their energy conversion capabilities. In this study, we demonstrate an optimal geometrical design of inertial vibration direct-current piezoelectric nanogenerators based on obliquely aligned InN nanowire (NW) arrays with an optimized oblique angle of ∼58°, and driven by the inertial force of their own weight, using a mechanical shaker without any AC/DC converters. The nanogenerator device manifests potential applications not only as a unique energy harvesting device capable of scavenging energy from weak mechanical vibrations, but also as a sensitive strain sensor...
September 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28885555/a-uwb-improved-pdr-integration-algorithm-applied-to-dynamic-indoor-positioning-for-pedestrians
#9
Pengzhan Chen, Ye Kuang, Xiaoyue Chen
Inertial sensors are widely used in various applications, such as human motion monitoring and pedestrian positioning. However, inertial sensors cannot accurately define the process of human movement, a limitation that causes data drift in the process of human body positioning, thus seriously affecting positioning accuracy and stability. The traditional pedestrian dead-reckoning algorithm, which is based on a single inertial measurement unit, can suppress the data drift, but fails to accurately calculate the number of walking steps and heading value, thus it cannot meet the application requirements...
September 8, 2017: Sensors
https://www.readbyqxmd.com/read/28885155/a-nonlinear-dynamics-based-estimator-for-functional-electrical-stimulation-preliminary-results-from-lower-leg-extension-experiments
#10
Marcus Allen, Qiang Zhong, Nicholas Kirsch, Ashwin Dani, William W Clark, Nitin Sharma
Miniature inertial measurement units (IMUs) are wearable sensors that measure limb segment or joint angles during dynamic movements. However, IMUs are generally prone to drift, external magnetic interference, and measurement noise. This paper presents a new class of nonlinear state estimation technique called state-dependent coefficient (SDC) estimation to accurately predict joint angles from IMU measurements. The SDC estimation method uses limb dynamics, instead of limb kinematics, to estimate the limb state...
September 7, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28880843/a-novel-dual-gating-approach-using-joint-inertial-sensors-implications-for-cardiac-pet-imaging
#11
Mojtaba Jafari Tadi, Jarmo Teuho, Eero Lennart Lehtonen, Antti Saraste, Mikko Pänkäälä, Tero Koivisto, Mika Teras
Positron emission tomography (PET) is a non-invasive imaging technique which may be considered as the state of art for the examination of cardiac inflammation due to atherosclerosis. A fundamental limitation of PET is that cardiac and respiratory motions reduce the quality of the achieved images. Current approaches for motion compensation involve gating the PET data based on the timing of quiescent periods of cardiac and respiratory cycles. In this study, we present a novel gating method called microelectromechanical (MEMS) dual gating which relies on joint non-electrical sensors, i...
September 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28880702/the-feasibility-and-validity-of-body-worn-sensors-to-supplement-timed-walking-tests-for-children-with-neurological-conditions
#12
Lavan Sivarajah, Kyra J Kane, Joel Lanovaz, Derek Bisaro, Alison Oates, Ming Ye, Kristin E Musselman
AIMS: The 10-meter walk test (10 mWT) and Timed Up and Go (TUG) are assessments of speed/time with a ceiling effect in pediatric populations. This study aimed to (1) determine whether collecting spatiotemporal data with inertial sensors (Mobility Lab, APDM Inc.) during these tests improves their discriminative validity, and (2) evaluate the clinical feasibility of Mobility Lab. METHODS: Fifteen children with spina bifida (SB) or cerebral palsy (CP) (7.9 ± 3.1 years old) and fifteen age- and sex-matched typically-developing (TD) children completed the 10 mWT and TUG wearing Mobility Lab...
September 7, 2017: Physical & Occupational Therapy in Pediatrics
https://www.readbyqxmd.com/read/28879179/capturing-the-cranio-caudal-signature-of-a-turn-with-inertial-measurement-systems-methods-parameters-robustness-and-reliability
#13
Karina Lebel, Hung Nguyen, Christian Duval, Réjean Plamondon, Patrick Boissy
BACKGROUND: Turning is a challenging mobility task requiring coordination and postural stability. Optimal turning involves a cranio-caudal sequence (i.e., the head initiates the motion, followed by the trunk and the pelvis), which has been shown to be altered in patients with neurodegenerative diseases, such as Parkinson's disease as well as in fallers and frails. Previous studies have suggested that the cranio-caudal sequence exhibits a specific signature corresponding to the adopted turn strategy...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28875947/improved-prediction-of-bimanual-movements-by-a-two-staged-effector-then-trajectory-decoder-with-epidural-ecog-in-nonhuman-primates
#14
Hoseok Choi, Jeyeon Lee, Jinsick Park, Seho Lee, Kyoung-Ha Ahn, In Young Kim, Kyoung-Min Lee, Dong Pyo Jang
OBJECTIVE: In arm movement BCIs (brain-computer interfaces), unimanual research has been much more extensively studied than its bimanual counterpart. However, it is well known that the bimanual brain state is different from the unimanual one. Conventional methodology used in unimanual studies does not take the brain stage into consideration, and therefore appears to be insufficient for decoding bimanual movements. In this paper, we propose the use of a two-staged (effector-then-trajectory) decoder, which combines the classification of movement conditions and uses a hand trajectory predicting algorithm for unimanual and bimanual movements, for application to in real-world BCIs...
September 6, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28866347/wearable-inertial-sensors-allow-for-quantitative-assessment-of-shoulder-and-elbow-kinematics-in-a-cadaveric-knee-arthroscopy-model
#15
Michael Rose, Carolin Curtze, Joseph O'Sullivan, Mahmoud El-Gohary, Dennis Crawford, Darin Friess, Jacqueline M Brady
PURPOSE: To develop a model using wearable inertial sensors to assess the performance of orthopaedic residents while performing a diagnostic knee arthroscopy. METHODS: Fourteen subjects performed a diagnostic arthroscopy on a cadaveric right knee. Participants were divided into novices (5 postgraduate year 3 residents), intermediates (5 postgraduate year 4 residents), and experts (4 faculty) based on experience. Arm movement data were collected by inertial measurement units (Opal sensors) by securing 2 sensors to each upper extremity (dorsal forearm and lateral arm) and 2 sensors to the trunk (sternum and lumbar spine)...
August 30, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28866303/fuzzy-inference-model-evaluating-turn-for-parkinson-s-disease-patients
#16
Christopher Ornelas-Vences, Luis Pastor Sanchez-Fernandez, Luis Alejandro Sanchez-Perez, Alejandro Garza-Rodriguez, Albino Villegas-Bastida
Parkinson's disease is a chronic illness that affects motor skills. The Unified Parkinson's Disease Rating Scale sponsored by the Movement Disorder Society (MDS-UPDRS) quantifies the current state of the disease based on clinician's observations. In this scale, turning is part of the gait assessment, yet specific guidelines on which features to observe and rate are still unclear. What is more, only visual impairment detection is used as the main subjective rating tool. In this respect, four biomechanical features are extracted from sensors worn on the lower limbs in this work...
August 30, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28863706/multi-rate-cubature-kalman-filter-based-data-fusion-method-with-residual-compensation-to-adapt-to-sampling-rate-discrepancy-in-attitude-measurement-system
#17
Xiaoting Guo, Changku Sun, Peng Wang
This paper investigates the multi-rate inertial and vision data fusion problem in nonlinear attitude measurement systems, where the sampling rate of the inertial sensor is much faster than that of the vision sensor. To fully exploit the high frequency inertial data and obtain favorable fusion results, a multi-rate CKF (Cubature Kalman Filter) algorithm with estimated residual compensation is proposed in order to adapt to the problem of sampling rate discrepancy. During inter-sampling of slow observation data, observation noise can be regarded as infinite...
August 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28862665/wearable-devices-for-classification-of-inadequate-posture-at-work-using-neural-networks
#18
Eya Barkallah, Johan Freulard, Martin J-D Otis, Suzy Ngomo, Johannes C Ayena, Christian Desrosiers
Inadequate postures adopted by an operator at work are among the most important risk factors in Work-related Musculoskeletal Disorders (WMSDs). Although several studies have focused on inadequate posture, there is limited information on its identification in a work context. The aim of this study is to automatically differentiate between adequate and inadequate postures using two wearable devices (helmet and instrumented insole) with an inertial measurement unit (IMU) and force sensors. From the force sensors located inside the insole, the center of pressure (COP) is computed since it is considered an important parameter in the analysis of posture...
September 1, 2017: Sensors
https://www.readbyqxmd.com/read/28859201/characterization-of-head-trunk-coordination-deficits-after-unilateral-vestibular-hypofunction-using-wearable-sensors
#19
Serene S Paul, Leland E Dibble, Raymond G Walther, Clough Shelton, Richard Klaus Gurgel, Mark E Lester
Importance: Individuals with vestibular hypofunction acutely restrict head motion to reduce symptoms of dizziness and nausea. This restriction results in abnormal decoupling of head motion from trunk motion, but the character, magnitude, and persistence of these deficits are unclear. Objective: To use wearable inertial sensors to quantify the extent of head and trunk kinematic abnormalities in the subacute stage after resection of vestibular schwannoma (VS) and the particular areas of deficit in head-trunk motion...
August 31, 2017: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28858808/using-inertial-sensors-to-automatically-detect-and-segment-activities-of-daily-living-in-people-with-parkinson-s-disease
#20
Hung Nguyen, Karina Lebel, Sarah Bogard, Etienne Goubault, Patrick Boissy, Qpn Clinicians, Christian Duval
Wearable sensors such as Inertial Measuring Units (IMUs) have been widely used to measure the quantity of physical activities during daily living in healthy and people with movement disorders through activity classification. These sensors have the potential to provide valuable information to evaluate the quality of the movement during activities of daily living (ADL) such as walking, sitting down and standing up, which could help clinicians to monitor rehabilitation and pharmaceutical interventions. However, high accuracy in the detection and segmentation of these activities is necessary for proper evaluation of the quality of the performance within a given segment...
August 25, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
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