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https://www.readbyqxmd.com/read/28448851/accurate-3d-reconstruction-of-bony-surfaces-using-ultrasonic-synthetic-aperture-techniques-for-robotic-knee-arthroplasty
#1
William Kerr, Philip Rowe, Stephen Gareth Pierce
Robotically guided knee arthroplasty systems generally require an individualized, preoperative 3D model of the knee joint. This is typically measured using Computed Tomography (CT) which provides the required accuracy for preoperative surgical intervention planning. Ultrasound imaging presents an attractive alternative to CT, allowing for reductions in cost and the elimination of doses of ionizing radiation, whilst maintaining the accuracy of the 3D model reconstruction of the joint. Traditional phased array ultrasound imaging methods, however, are susceptible to poor resolution and signal to noise ratios (SNR)...
April 19, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28422771/slow-intermuscular-oscillations-are-associated-with-cocontraction-steadiness
#2
Nayef E Ahmar, Minoru Shinohara
PURPOSE: Voluntary muscle contraction often involves low-frequency correlated neural oscillations across muscles, which may degrade steady cocontraction between antagonistic muscles with distinct levels of activation per each muscle (unbalanced cocontraction). The purposes of the study were 1) to determine whether there is an association between the low-frequency correlated EMG oscillations and performance of steady unbalanced cocontraction across individuals and 2) to determine whether a bout of out-of-phase cocontraction practice reduces the in-phase low-frequency correlated neural oscillations and improves the performance of steady unbalanced cocontraction...
April 19, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28422650/joint-magnetic-calibration-and-localization-based-on-expectation-maximization-for-tongue-tracking
#3
Jun Lu, Zhongtao Yang, Klaus Okkelberg, Maysam Ghovanloo
BACKGROUND: Tongue tracking, which helps researchers gain valuable insights into speech mechanism, has many applications in speech therapy and language learning. The wireless localization technique, which involves tracking a small magnetic tracer within the 3-D oral space, provides a low cost and convenient approach to capture tongue kinematics. In practice, this technique requires accurate calibration of 3-axial magnetic sensors used in the tracking system. The data-driven calibration depends on the trajectories of magnetic tracer and the ambient noise, which may change across time and space...
April 12, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28410738/soft-tissue-artefacts-of-skin-markers-on-the-lower-limb-during-cycling-effects-of-joint-angles-and-pedal-resistance
#4
Jia-Da Li, Tung-Wu Lu, Cheng-Chung Lin, Mei-Ying Kuo, Horng-Chaung Hsu, Wu-Chung Shen
Soft tissue artefacts (STA) are a major error source in skin marker-based measurement of human movement, and are difficult to eliminate non-invasively. The current study quantified in vivo the STA of skin markers on the thigh and shank during cycling, and studied the effects of knee angles and pedal resistance by using integrated 3D fluoroscopy and stereophotogrammetry. Fifteen young healthy adults performed stationary cycling with and without pedal resistance, while the marker data were measured using a motion capture system, and the motions of the femur and tibia/fibula were recorded using a bi-plane fluoroscopy-to-CT registration method...
April 3, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28388531/stiffness-and-proprioceptive-contributions-of-ankle-braces-and-the-influence-of-localized-muscle-fatigue
#5
Courtney A Webster, Maury A Nussbaum, Michael L Madigan
Ankle braces are a common treatment to reduce ankle sprain recurrence among individuals with chronic ankle instability (CAI). Bracing provides supplemental external joint stiffness and/or improved proprioceptive acuity. The goals of this study were to assess the effects of two ankle braces on joint position sense (JPS) and ankle stiffness, and determine whether bracing effects are reduced with localized muscle fatigue. Measures of JPS and ankle stiffness were obtained from participants with CAI (n=12) for three conditions (no brace, a neoprene wrap brace, and a semi-rigid brace), before and after inducing localized muscle fatigue at the ankle...
March 2, 2017: Journal of Electromyography and Kinesiology
https://www.readbyqxmd.com/read/28368831/continuous-movement-tracking-performance-for-predictable-and-unpredictable-tasks-with-vibrotactile-feedback
#6
Peter B Shull, Xiangyang Zhu, Mark R Cutkosky
The purpose of this paper was to determine human movement tracking performance in response to vibrotactile feedback tracking for predictable and unpredictable continuous movement tasks. Thirteen subjects performed elbow flexion/extension and knee flexion/extension continuous movement tracking tasks while receiving tactile stimulation proportional to limb joint position error. Subjects followed 0.2-2.0Hz desired movements for predictable tasks (single sinusoid) and unpredictable tasks (combination of three sinusoids)...
March 29, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28353683/model-based-estimation-of-ankle-joint-stiffness
#7
Berno J E Misgeld, Tony Zhang, Markus J Lüken, Steffen Leonhardt
We address the estimation of biomechanical parameters with wearable measurement technologies. In particular, we focus on the estimation of sagittal plane ankle joint stiffness in dorsiflexion/plantar flexion. For this estimation, a novel nonlinear biomechanical model of the lower leg was formulated that is driven by electromyographic signals. The model incorporates a two-dimensional kinematic description in the sagittal plane for the calculation of muscle lever arms and torques. To reduce estimation errors due to model uncertainties, a filtering algorithm is necessary that employs segmental orientation sensor measurements...
March 29, 2017: Sensors
https://www.readbyqxmd.com/read/28341590/guidelines-for-validation-of-next-generation-sequencing-based-oncology-panels-a-joint-consensus-recommendation-of-the-association-for-molecular-pathology-and-college-of-american-pathologists
#8
REVIEW
Lawrence J Jennings, Maria E Arcila, Christopher Corless, Suzanne Kamel-Reid, Ira M Lubin, John Pfeifer, Robyn L Temple-Smolkin, Karl V Voelkerding, Marina N Nikiforova
Next-generation sequencing (NGS) methods for cancer testing have been rapidly adopted by clinical laboratories. To establish analytical validation best practice guidelines for NGS gene panel testing of somatic variants, a working group was convened by the Association of Molecular Pathology with liaison representation from the College of American Pathologists. These joint consensus recommendations address NGS test development, optimization, and validation, including recommendations on panel content selection and rationale for optimization and familiarization phase conducted before test validation; utilization of reference cell lines and reference materials for evaluation of assay performance; determining of positive percentage agreement and positive predictive value for each variant type; and requirements for minimal depth of coverage and minimum number of samples that should be used to establish test performance characteristics...
May 2017: Journal of Molecular Diagnostics: JMD
https://www.readbyqxmd.com/read/28321187/steps-to-health-in-cognitive-aging-effects-of-physical-activity-on-spatial-attention-and-executive-control-in-the-elderly
#9
Giancarlo Condello, Roberta Forte, Simone Falbo, John B Shea, Angela Di Baldassarre, Laura Capranica, Caterina Pesce
The purpose of this study was to investigate whether physical activity (PA) habits may positively impact performance of the orienting and executive control networks in community-dwelling aging individuals and diabetics, who are at risk of cognitive dysfunction. To this aim, we tested cross-sectionally whether age, ranging from late middle-age to old adulthood, and PA level independently or interactively predict different facets of the attentional performance. Hundred and thirty female and male individuals and 22 adults with type 2 diabetes aged 55-84 years were recruited and their daily PA (steps) was objectively measured by means of armband monitors...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28320423/in-vivo-estimation-of-the-shoulder-joint-center-of-rotation-using-magneto-inertial-sensors-mri-based-accuracy-and-repeatability-assessment
#10
M Crabolu, D Pani, L Raffo, M Conti, P Crivelli, A Cereatti
BACKGROUND: The human gleno-humeral joint is normally represented as a spherical hinge and its center of rotation is used to construct humerus anatomical axes and as reduction point for the computation of the internal joint moments. The position of the gleno-humeral joint center (GHJC) can be estimated by recording ad hoc shoulder joint movement following a functional approach. In the last years, extensive research has been conducted to improve GHJC estimate as obtained from positioning systems such as stereo-photogrammetry or electromagnetic tracking...
March 21, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28318316/bilateral-proprioceptive-evaluation-in-individuals-with-unilateral-chronic-ankle-instability
#11
Andreia S P Sousa, João Leite, Bianca Costa, Rubim Santos
CONTEXT:   Despite extensive research on chronic ankle instability, the findings regarding proprioception have been conflicting and focused only on the injured limb. Also, the different components of proprioception have been evaluated in isolation. OBJECTIVE:   To evaluate bilateral ankle proprioception in individuals with unilateral ankle instability. DESIGN:   Cohort study. SETTING:   Research laboratory center in a university...
April 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28316255/a-bayesian-double-fusion-model-for-resting-state-brain-connectivity-using-joint-functional-and-structural-data
#12
Hakmook Kang, Hernando Ombao, Christopher Fonnesbeck, Zhaohua Ding, Victoria L Morgan
Current approaches separately analyze concurrently acquired diffusion tensor imaging (DTI) and functional magnetic resonance imaging (fMRI) data. The primary limitation of these approaches is that they do not take advantage of the information from DTI that could potentially enhance estimation of resting-state functional connectivity (FC) between brain regions. To overcome this limitation, we develop a Bayesian hierarchical spatiotemporal model that incorporates structural connectivity (SC) into estimating FC...
April 24, 2017: Brain Connectivity
https://www.readbyqxmd.com/read/28302125/joint-longitudinal-data-analysis-in-detecting-determinants-of-cd4-cell-count-change-and-adherence-to-highly-active-antiretroviral-therapy-at-felege-hiwot-teaching-and-specialized-hospital-north-west-ethiopia-amhara-region
#13
Awoke Seyoum, Principal Ndlovu, Zewotir Temesgen
BACKGROUND: Adherence and CD4 cell count change measure the progression of the disease in HIV patients after the commencement of HAART. Lack of information about associated factors on adherence to HAART and CD4 cell count reduction is a challenge for the improvement of cells in HIV positive adults. The main objective of adopting joint modeling was to compare separate and joint models of longitudinal repeated measures in identifying long-term predictors of the two longitudinal outcomes: CD4 cell count and adherence to HAART...
March 16, 2017: AIDS Research and Therapy
https://www.readbyqxmd.com/read/28290704/predicting-manual-therapy-treatment-success-in-patients-with-chronic-ankle-instability-improving-self-reported-function
#14
Erik A Wikstrom, Patrick O McKeon
CONTEXT:   Therapeutic modalities that stimulate sensory receptors around the foot-ankle complex improve chronic ankle instability (CAI)-associated impairments. However, not all patients have equal responses to these modalities. Identifying predictors of treatment success could improve clinician efficiency when treating patients with CAI. OBJECTIVE:   To conduct a response analysis on existing data to identify predictors of improved self-reported function in patients with CAI...
April 2017: Journal of Athletic Training
https://www.readbyqxmd.com/read/28288610/cervical-spine-reposition-errors-after-cervical-flexion-and-extension
#15
Xu Wang, René Lindstroem, Niels Peter Bak Carstens, Thomas Graven-Nielsen
BACKGROUND: Upright head and neck position has been frequently applied as baseline for diagnosis of neck problems. However, the variance of the position after cervical motions has never been demonstrated. Thus, it is unclear if the baseline position varies evenly across the cervical joints. The purpose was to assess reposition errors of upright cervical spine. METHODS: Cervical reposition errors were measured in twenty healthy subjects (6 females) using video-fluoroscopy...
March 13, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28286578/validity-of-the-microsoft-kinect-system-in-assessment-of-compensatory-stepping-behavior-during-standing-and-treadmill-walking
#16
Guy Shani, Amir Shapiro, Goldstein Oded, Kagan Dima, Itshak Melzer
BACKGROUND: Rapid compensatory stepping plays an important role in preventing falls when balance is lost; however, these responses cannot be accurately quantified in the clinic. The Microsoft Kinect™ system provides real-time anatomical landmark position data in three dimensions (3D), which may bridge this gap. METHODS: Compensatory stepping reactions were evoked in 8 young adults by a sudden platform horizontal motion on which the subject stood or walked on a treadmill...
2017: European Review of Aging and Physical Activity
https://www.readbyqxmd.com/read/28285744/dynamic-time-warping-compared-to-established-methods-for-validation-of-musculoskeletal-models
#17
Martin Gaspar, Bastian Welke, Frank Seehaus, Christof Hurschler, Michael Schwarze
By means of Multi-Body musculoskeletal simulation, important variables such as internal joint forces and moments can be estimated which cannot be measured directly. Validation can ensued by qualitative or by quantitative methods. Especially when comparing time-dependent signals, many methods do not perform well and validation is often limited to qualitative approaches. The aim of the present study was to investigate the capabilities of the Dynamic Time Warping (DTW) algorithm for comparing time series, which can quantify phase as well as amplitude errors...
April 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28269541/estimation-of-joint-center-and-measurement-of-finger-motion-by-inertial-sensors
#18
Keisuke Kitano, Akihito Ito, Nobutaka Tsujiuchi, Shigeru Wakida
The authors developed a wearable finger motion measurement system using inertial and geomagnetic sensors. Using this system, motion and posture of the hands and fingers can be measured. However, the joint center and segment axis cannot be accurately measured in a previous study using the sensors. Therefore, the authors proposed a method of estimating the joint center and segment lengths. This method utilizes the fact that the calculation formula of the rotational acceleration in the sensor's coordinate system is the vector product...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269303/a-preliminary-study-for-quantitative-assessment-of-upper-limb-proprioception
#19
Sara Contu, Asif Hussain, Lorenzo Masia, Domenico Campolo
Proprioception, or sense of position and movement of the body, strongly correlates with motor recovery of the hemiplegic arm. The evaluation of the awareness of the location of joints in space involves measuring the accuracy of joint-angle replication. Robotic devices allow an accurate manipulation of joint movements necessary to assess proprioceptive status. This study evaluated the proprioceptive performance of healthy subjects by mean of the H-Man, a planar robot designed for upper-limb rehabilitation to gather preliminary normative data for neurorehabilitation applications...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28264689/rapid-diagnostic-tests-failing-to-detect-plasmodium-falciparum-infections-in-eritrea-an-investigation-of-reported-false-negative-rdt-results
#20
Araia Berhane, Mulugeta Russom, Iyassu Bahta, Filmon Hagos, Michael Ghirmai, Selam Uqubay
BACKGROUND: Relatively large number of false-negative malaria rapid diagnostic test (RDT) results for microscopically confirmed Plasmodium falciparum cases were reported from five of the six administrative regions of Eritrea in 2015. This activated the Ministry of Health to conduct an initial exploratory investigation. The main objective of the investigation was to confirm the sensitivity of the RDTs in the field in microscopically confirmed malaria cases, identify the possible causes of the failure and recommend further actions to be taken...
March 6, 2017: Malaria Journal
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