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https://www.readbyqxmd.com/read/29165396/markerless-knee-joint-position-measurement-using-depth-data-during-stair-walking
#1
Ami Ogawa, Akira Mita, Ayanori Yorozu, Masaki Takahashi
Climbing and descending stairs are demanding daily activities, and the monitoring of them may reveal the presence of musculoskeletal diseases at an early stage. A markerless system is needed to monitor such stair walking activity without mentally or physically disturbing the subject. Microsoft Kinect v2 has been used for gait monitoring, as it provides a markerless skeleton tracking function. However, few studies have used this device for stair walking monitoring, and the accuracy of its skeleton tracking function during stair walking has not been evaluated...
November 22, 2017: Sensors
https://www.readbyqxmd.com/read/29163196/an-inertial-sensor-based-method-for-estimating-the-athlete-s-relative-joint-center-positions-and-center-of-mass-kinematics-in-alpine-ski-racing
#2
Benedikt Fasel, Jörg Spörri, Pascal Schütz, Silvio Lorenzetti, Kamiar Aminian
For the purpose of gaining a deeper understanding of the relationship between external training load and health in competitive alpine skiing, an accurate and precise estimation of the athlete's kinematics is an essential methodological prerequisite. This study proposes an inertial sensor-based method to estimate the athlete's relative joint center positions and center of mass (CoM) kinematics in alpine skiing. Eleven inertial sensors were fixed to the lower and upper limbs, trunk, and head. The relative positions of the ankle, knee, hip, shoulder, elbow, and wrist joint centers, as well as the athlete's CoM kinematics were validated against a marker-based optoelectronic motion capture system during indoor carpet skiing...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/29161264/proprioceptive-assessment-in-clinical-settings-evaluation-of-joint-position-sense-in-upper-limb-post-stroke-using-a-robotic-manipulator
#3
Sara Contu, Asif Hussain, Simone Kager, Aamani Budhota, Vishwanath A Deshmukh, Christopher W K Kuah, Lester H L Yam, Liming Xiang, Karen S G Chua, Lorenzo Masia, Domenico Campolo
Proprioception is a critical component for motor functions and directly affects motor learning after neurological injuries. Conventional methods for its assessment are generally ordinal in nature and hence lack sensitivity. Robotic devices designed to promote sensorimotor learning can potentially provide quantitative precise, accurate, and reliable assessments of sensory impairments. In this paper, we investigate the clinical applicability and validity of using a planar 2 degrees of freedom robot to quantitatively assess proprioceptive deficits in post-stroke participants...
2017: PloS One
https://www.readbyqxmd.com/read/29156412/a-system-level-mathematical-model-of-basal-ganglia-motor-circuit-for-kinematic-planning-of-arm-movements
#4
Armin Salimi-Badr, Mohammad Mehdi Ebadzadeh, Christian Darlot
In this paper, a novel system-level mathematical model of the Basal Ganglia (BG) for kinematic planning, is proposed. An arm composed of several segments presents a geometric redundancy. Thus, selecting one trajectory among an infinite number of possible ones requires overcoming redundancy, according to some kinds of optimization. Solving this optimization is assumed to be the function of BG in planning. In the proposed model, first, a mathematical solution of kinematic planning is proposed for movements of a redundant arm in a plane, based on minimizing energy consumption...
November 10, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/29129121/the-validity-and-intra-tester-reliability-of-markerless-motion-capture-to-analyse-kinematics-of-the-bmx-supercross-gate-start
#5
Josephine Grigg, Eric Haakonssen, Evelyne Rathbone, Robin Orr, Justin W L Keogh
The aim of this study was to quantify the validity and intra-tester reliability of a novel method of kinematic measurement. The measurement target was the joint angles of an athlete performing a BMX Supercross (SX) gate start action through the first 1.2 s of movement in situ on a BMX SX ramp using a standard gate start procedure. The method employed GoPro® Hero 4 Silver (GoPro Inc., USA) cameras capturing data at 120 fps 720 p on a 'normal' lens setting. Kinovea 0.8.15 (Kinovea.org, France) was used for analysis...
November 13, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/29105476/-clinical-observation-of-the-proprioceptive-sensibility-reflexotherapy-by-tendon-acupuncture-at-trigger-points-for-cervical-vertigo
#6
Fen-Fen Yao, Jun Luo, Jiao Liu, Wen-Yao Fang, Chen-Yu Zhang, Sheng Zhang, Yu-Lin Mao, Zhen Yuan, Kai Wang
OBJECTIVE: To evaluate the efficacy of the proprioceptive sensibility reflexotherapy by tendon acupuncture needling at trigger points for patients with proprioceptive disorder of cervical vertigo. METHODS: Seventy-nine patients with proprioceptive disorder of cervical vertigo were randomly assigned into a treatment group (42 cases) and a control group (37 cases). Patients in the treatment group received the proprioceptive sensibility reflexotherapy with tendon acupuncture at trigger points in the neck...
October 25, 2017: Zhen Ci Yan Jiu, Acupuncture Research
https://www.readbyqxmd.com/read/29077737/a-medical-imaging-analysis-system-for-trigger-finger-using-an-adaptive-texture-based-active-shape-model-atasm-in-ultrasound-images
#7
Bo-I Chuang, Li-Chieh Kuo, Tai-Hua Yang, Fong-Chin Su, I-Ming Jou, Wei-Jr Lin, Yung-Nien Sun
Trigger finger has become a prevalent disease that greatly affects occupational activity and daily life. Ultrasound imaging is commonly used for the clinical diagnosis of trigger finger severity. Due to image property variations, traditional methods cannot effectively segment the finger joint's tendon structure. In this study, an adaptive texture-based active shape model method is used for segmenting the tendon and synovial sheath. Adapted weights are applied in the segmentation process to adjust the contribution of energy terms depending on image characteristics at different positions...
2017: PloS One
https://www.readbyqxmd.com/read/29062629/smart-braid-feedback-for-the-closed-loop-control-of-soft-robotic-systems
#8
Wyatt Felt, Khai Yi Chin, C David Remy
This article experimentally investigates the potential of using flexible, inductance-based contraction sensors in the closed-loop motion control of soft robots. Accurate motion control remains a highly challenging task for soft robotic systems. Precise models of the actuation dynamics and environmental interactions are often unavailable. This renders open-loop control impossible, while closed-loop control suffers from a lack of suitable feedback. Conventional motion sensors, such as linear or rotary encoders, are difficult to adapt to robots that lack discrete mechanical joints...
September 1, 2017: Soft Robotics
https://www.readbyqxmd.com/read/29060400/estimation-of-joint-position-error
#9
Valentina Agostini, Samanta Rosati, Gabriella Balestra, Marco Trucco, Lorenzo Visconti, Marco Knaflitz
Joint position error (JPE) is frequently used to assess proprioception in rehabilitation and sport science. During position-reposition tests the subject is asked to replicate a specific target angle (e.g. 30° of knee flexion) for a specific number of times. The aim of this study is to find an effective method to estimate JPE from the joint kinematic signal. Forty healthy subjects were tested to assess knee joint position sense. Three different methods of JPE estimation are described and compared using a hierarchical clustering approach...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29057805/performance-analysis-for-joint-target-parameter-estimation-in-umts-based-passive-multistatic-radar-with-antenna-arrays-using-modified-cram%C3%A3-r-rao-lower-bounds
#10
Chenguang Shi, Fei Wang, Sana Salous, Jianjiang Zhou
In this study, the modified Cramér-Rao lower bounds (MCRLBs) on the joint estimation of target position and velocity is investigated for a universal mobile telecommunication system (UMTS)-based passive multistatic radar system with antenna arrays. First, we analyze the log-likelihood redfunction of the received signal for a complex Gaussian extended target. Then, due to the non-deterministic transmitted data symbols, the analytically closed-form expressions of the MCRLBs on the Cartesian coordinates of target position and velocity are derived for a multistatic radar system with N t UMTS-based transmit station of L t antenna elements and N r receive stations of L r antenna elements...
October 18, 2017: Sensors
https://www.readbyqxmd.com/read/29034799/measurement-properties-of-a-test-battery-to-assess-postural-orientation-during-functional-tasks-in-patients-undergoing-acl-injury-rehabilitation
#11
Jenny Nae, Mark W Creaby, Gustav Nilsson, Kay M Crossley, Eva Ageberg
Study Design Cross-sectional study. Background Visual rating of postural orientation (PO) during functional tasks may be a valuable tool to track rehabilitation progress following anterior cruciate ligament (ACL) injury. A valid test battery assessing PO as a separate construct is lacking. Objectives To evaluate measurement properties of a test battery to assess PO in patients with ACL injury. Methods Content validity of functional tasks was assessed by expert focus group discussions. 51 patients (45% women) with ACL injury performed nine functional tasks of varying difficulty...
October 15, 2017: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/28992613/is-the-reliability-of-3d-kinematics-of-young-obese-participants-dependent-on-the-hip-joint-center-localization-method-used
#12
Brian Horsak, Caterine Schwab, Christoph Clemens, Arnold Baca, Susanne Greber-Platzer, Alexandra Kreissl, Andreas Kranzl
The aim of this study was to investigate if the test-retest reliability for three-dimensional (3D) gait kinematics in a young obese population is affected by using either a predictive (Davis) or a functional (SCoRE) hip joint center (HJC) localization approach. A secondary goal was to analyze how consistent both methods perform in estimating the HJC position. A convenience sample of ten participants, two females and eight males with an age-based body mass index (BMI) above the 97th percentile (mean±SD: 34...
September 23, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28989273/mechanical-model-of-dexterous-continuum-manipulators-with-compliant-joints-and-tendon-external-force-interactions
#13
Anzhu Gao, Ryan J Murphy, Hao Liu, Iulian I Iordachita, Mehran Armand
Dexterous continuum manipulators (DCMs) have been widely adopted for minimally- and less-invasive surgery. During the operation, these DCMs interact with surrounding anatomy actively or passively. The interaction force will inevitably affect the tip position and shape of DCMs, leading to potentially inaccurate control near critical anatomy. In this paper, we demonstrated a 2D mechanical model for a tendon actuated, notched DCM with compliant joints. The model predicted deformation of the DCM accurately in the presence of tendon force, friction force, and external force...
February 2017: IEEE/ASME Transactions on Mechatronics
https://www.readbyqxmd.com/read/28970122/the-development-and-validation-of-a-custom-built-device-for-assessing-frontal-knee-joint-laxity
#14
Shiek Abdullah Ismail, Milena Simic, Jillian L Clarke, Thiago Jambo Alves Lopes, Evangelos Pappas
INTRODUCTION: This study reports the development and validation of a quantitative technique of assessing frontal knee joint laxity through a custom built device named KLICP. The objectives of this study were to determine: (i) the intra- and inter-rater reliability and (ii) the validity of the device when compared to real time ultrasound. METHODS: Twenty-five participants had their frontal knee joint laxity assessed by the KLICP, by manual varus/valgus tests and by ultrasound...
September 29, 2017: Knee
https://www.readbyqxmd.com/read/28959198/distributed-neural-processing-predictors-of-multi-dimensional-properties-of-affect
#15
Keith A Bush, Cory S Inman, Stephan Hamann, Clinton D Kilts, G Andrew James
Recent evidence suggests that emotions have a distributed neural representation, which has significant implications for our understanding of the mechanisms underlying emotion regulation and dysregulation as well as the potential targets available for neuromodulation-based emotion therapeutics. This work adds to this evidence by testing the distribution of neural representations underlying the affective dimensions of valence and arousal using representational models that vary in both the degree and the nature of their distribution...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28948067/cervical-sensorimotor-control-in-idiopathic-cervical-dystonia-a%C3%A2-cross-sectional-study
#16
Joke De Pauw, Rudy Mercelis, Ann Hallemans, Sarah Michiels, Steven Truijen, Patrick Cras, Willem De Hertogh
OBJECTIVES: Patients with idiopathic adult-onset cervical dystonia (CD) experience an abnormal head posture and involuntary muscle contractions. Although the exact areas affected in the central nervous system remain uncertain, impaired functions in systems stabilizing the head and neck are apparent such as the somatosensory and sensorimotor integration systems. The aim of the study is to investigate cervical sensorimotor control dysfunction in patients with CD. MATERIAL AND METHODS: Cervical sensorimotor control was assessed by a head repositioning task in 24 patients with CD and 70 asymptomatic controls...
September 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28922423/proprioception-in-patients-with-posterior-cruciate-ligament-tears-a-meta-analysis-comparison-of-reconstructed-and-contralateral-normal-knees
#17
REVIEW
Jung-Ro Yoon, Dae-Hee Lee, Seung-Nam Ko, Young-Soo Shin
Posterior cruciate ligament (PCL) reconstruction for patients with PCL insufficiency has been associated with postoperative improvements in proprioceptive function due to mechanoreceptor regeneration. However, it is unclear whether reconstructed PCL or contralateral normal knees have better proprioceptive function outcomes. This meta-analysis was designed to compare the proprioceptive function of reconstructed PCL or contralateral normal knees in patients with PCL insufficiency. All studies that compared proprioceptive function, as assessed with threshold to detect passive movement (TTDPM) or joint position sense (JPS) in PCL reconstructed or contralateral normal knees were included...
2017: PloS One
https://www.readbyqxmd.com/read/28904099/spasticity-may-obscure-motor-learning-ability-after-stroke
#18
Sandeep K Subramanian, Anatol G Feldman, Mindy F Levin
Previous motor learning studies based on adapting movements of the hemiparetic arm in stroke subjects have not accounted for spasticity occurring in specific joint ranges (spasticity zones), resulting in equivocal conclusions about learning capacity. We compared the ability of participants with stroke to rapidly adapt elbow extension movements to changing external load conditions outside and inside spasticity zones. Participants with stroke (n=12, aged: 57.8±9.6 years) and healthy age-matched controls (n=8, 63...
September 13, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28895040/clinical-utility-of-ultra-low-dose-pre-test-exposure-to-avoid-unnecessary-patient-exposure-due-to-positioning-errors-a-simulation-study
#19
Hideo Nose, Junji Shiraishi
The use of digital radiographic systems has decreased the frequency of image retakes due to over/underexposure in general radiography. However, image retakes owing to patient positioning errors are likely to increase because of the convenience of a real-time image check on a console table. The purpose of the present study is to propose a novel radiographic examination procedure with an ultra-low-dose pre-test exposure that may be utilized to check patient positioning prior to taking an actual image, thereby reducing unnecessary patient exposure owing to image retakes...
September 11, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28888740/can-the-hip-joint-center-be-estimated-from-pelvic-dimensions-in-dysplastic-hips
#20
Masanori Fujii, Tetsuro Nakamura, Toshihiko Hara, Yasuharu Nakashima
BACKGROUND: We aimed to determine correlations between the hip joint center position and pelvic dimensions and whether the three-dimensional position of the original hip joint center could be estimated from pelvic landmarks in dysplastic and normal hips. METHODS: We reviewed the pelvic CT scans of 70 patients (70 hips) with hip dysplasia. Seventy-seven normal hips were used as controls. The hip joint center coordinates (Cx, Cy, and Cz) and pelvic dimensions were measured with reference to the anterior pelvic plane coordinate system...
September 6, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
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