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https://www.readbyqxmd.com/read/29332663/results-after-radial-head-arthroplasty-in-unstable-fractures
#1
Ariana Lott, Kari Broder, Abraham Goch, Sanjit R Konda, Kenneth A Egol
BACKGROUND: Whereas most radial head fractures are stable injuries, they sometimes occur as part of complex injury patterns with associated elbow instability. Radial head arthroplasty has been favored in patients with unreconstructable radial head fractures and unstable elbow injuries. The purpose of this study was to review radiographic outcomes, functional outcomes, and complications after radial head arthroplasty for radial head fracture in unstable elbow injuries. METHODS: This study was a retrospective review of radial head fractures treated with radial head arthroplasty by a single surgeon during a 15-year period...
February 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29310911/attenuated-resting-state-functional-connectivity-in-patients-with-childhood-and-adult-onset-schizophrenia
#2
Rebecca E Watsky, Stephen J Gotts, Rebecca A Berman, Harrison M McAdams, Xueping Zhou, Dede Greenstein, Francois M Lalonde, Peter Gochman, Liv S Clasen, Lorie Shora, Anna E Ordóñez, Nitin Gogtay, Alex Martin, Deanna M Barch, Judith L Rapoport, Siyuan Liu
BACKGROUND: Childhood-onset schizophrenia (COS) is a rare, severe form of the adult-onset disorder (AOS). Our previous resting-state fMRI study identified attenuated functional connectivity in COS compared with controls. Here, we ask whether COS and AOS patients and their siblings exhibit similar abnormalities of functional connectivity. METHODS: A whole-brain, data-driven approach was used to assess resting-state functional connectivity differences in COS (patients/siblings/controls, n: 26/28/33) and AOS (n: 19/28/30)...
January 6, 2018: Schizophrenia Research
https://www.readbyqxmd.com/read/29286962/fractures-of-the-bilateral-c2-neurocentral-and-lateral-dental-synchondroses-with-kyphotic-c1-c2-subluxation-in-a-3-year-old-girl-a-description-of-a-rare-fracture-pattern-and-its-treatment-a-case-report
#3
Lucienne Gautier, Christoph Aufdenblatten, Stefan Dierauer, Leonhard Ramseier, Luca Mazzone, Hanspeter Huber, Mazda Farshad
CASE: Spinal fractures are rare in young children. Because spinal anatomy and biomechanics differ in children and adults, knowledge of the deviations of the juvenile spine is necessary for adequate treatment. We present the case of a young girl with an unusual C2 fracture that included rupture of both of the neurocentral and lateral dental synchondroses, with an opening of the synchondroses and a caudal dislocation of both vertebral arches following a head-on motor vehicle collision. The whole body and apex of the dens was displaced anteriorly and cranially with a kyphotic angulation of 34°...
October 2017: JBJS Case Connector
https://www.readbyqxmd.com/read/29278774/data-driven-assessment-of-structural-image-quality
#4
Adon F G Rosen, David R Roalf, Kosha Ruparel, Jason Blake, Kevin Seelaus, Lakshmi P Villa, Rastko Ciric, Philip A Cook, Christos Davatzikos, Mark A Elliott, Angel Garcia de La Garza, Efstathios D Gennatas, Megan Quarmley, J Eric Schmitt, Russell T Shinohara, M Dylan Tisdall, R Cameron Craddock, Raquel E Gur, Ruben C Gur, Theodore D Satterthwaite
Data quality is increasingly recognized as one of the most important confounding factors in brain imaging research. It is particularly important for studies of brain development, where age is systematically related to in-scanner motion and data quality. Prior work has demonstrated that in-scanner head motion biases estimates of structural neuroimaging measures. However, objective measures of data quality are not available for most structural brain images. Here we sought to identify quantitative measures of data quality for T1-weighted volumes, describe how such measures of quality relate to cortical thickness, and delineate how this in turn may bias inference regarding associations with age in youth...
December 23, 2017: NeuroImage
https://www.readbyqxmd.com/read/29242788/obturator-dislocation-of-hip-with-ipsilateral-fracture-neck-femur-a-case-report
#5
Sumit Kumar Jain, Parit Aggarwal, Arun Yadav
Introduction: Traumatic dislocation of the hip with ipsilateral fracture neck femur is a rare injury because of the different mechanism of both these injuries. The management of such injuries is a challenge as the chances of nonunion and avascular necrosis of femoral head are very high with fixation methods. We report a case of obturator dislocation of the hip with ipsilateral fracture neck of the femur which was treated with uncemented total hip replacement. Case Report: A 32-year-old male sustained obturator dislocation with ipsilateral fracture neck femur following road traffic accident...
September 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/29238254/assessment-of-three-dimensional-trunk-kinematics-and-muscle-activation-during-cycling-with-independent-cranks
#6
Eric Bourdon, Matthew Mavor, Dean C Hay
Independent cranks (IC) are recently introduced bicycle cranks that are decoupled; therefore allowing each leg to pedal independent of the other. Despite this introduction, limited research has been conducted assessing biomechanical changes when cycling with IC. Therefore, the purpose of this study was to evaluate and compare trunk kinematics and surface electromyography (sEMG) during IC and normal crank (NC) cycling during a graded exercise test to volitional fatigue. Ten healthy, physically active men performed two tests (IC and NC) on a cycling ergometer on separate days...
December 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/29183568/vertical-head-and-pelvic-movement-symmetry-at-the-trot-in-dogs-with-induced-supporting-limb-lameness
#7
C B Gómez Álvarez, P Gustås, A Bergh, M Rhodin
Compensatory limb loading has been studied in lame dogs; however, little is known about how these compensations relate to motion of the head and pelvis, assessment of which is an important component of lameness examinations. The aim of this study was to describe the patterns of vertical head and pelvic motion symmetry at the trot in dogs with induced supporting limb lameness in the forelimbs or hind limbs. Ten sound dogs were trotted on a treadmill before and after temporary induction of moderate lameness (grade 2/5) in each limb...
November 2017: Veterinary Journal
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
#8
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/29121059/effects-of-decades-of-physical-driving-on-body-movement-and-motion-sickness-during-virtual-driving
#9
Thomas A Stoffregen, Chih-Hui Chang, Fu-Chen Chen, Wei-Jhong Zeng
We investigated relations between experience driving physical automobiles and motion sickness during the driving of virtual automobiles. Middle-aged individuals drove a virtual automobile in a driving video game. Drivers were individuals who had possessed a driver's license for approximately 30 years, and who drove regularly, while non-drivers were individuals who had never held a driver's license, or who had not driven for more than 15 years. During virtual driving, we monitored movement of the head and torso...
2017: PloS One
https://www.readbyqxmd.com/read/29114772/development-of-a-single-degree-of-freedom-mechanical-model-for-predicting-strain-based-brain-injury-responses
#10
Lee F Gabler, Hamed Joodaki, Jeff R Crandall, Matthew B Panzer
Linking head impact kinematics to injury risk has been the focus of numerous brain injury criteria. Although many early forms were developed using mechanics principles, recent criteria have been developed using empirical methods based on subsets of head impact data. In this study, a single-degree-of-freedom (sDOF) mechanical analogue was developed to study the link between rotational head kinematics and brain deformation. Model efficacy was assessed by comparing its dynamic response to strain-based brain injury predictors from finite element (FE) human head models...
November 6, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/29104944/psychotropic-medication-use-in-autism-spectrum-disorders-may-affect-functional-brain-connectivity
#11
Annika C Linke, Lindsay Olson, Yangfeifei Gao, Inna Fishman, Ralph-Axel Müller
Background: Prescription of psychotropic medications is common in autism spectrum disorders (ASDs), either off-label or to treat comorbid conditions such as ADHD or depression. Psychotropic medications are intended to alter brain function. Yet, studies investigating the functional brain organization in ASDs rarely take medication usage into account. This could explain some of the inconsistent findings of atypical brain network connectivity reported in the autism literature. Methods: The current study tested whether functional connectivity patterns, as assessed with functional magnetic resonance imaging (fMRI), differed in a cohort of 49 children and adolescents with ASDs based on psychotropic medication status, and in comparison with 50 matched typically developing (TD) participants...
September 2017: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29095888/origin-of-directionally-tuned-responses-in-lower-limb-muscles-to-unpredictable-upper-limb-disturbances
#12
Ali Forghani, Theodore E Milner
Unpredictable forces which perturb balance are frequently applied to the body through interaction between the upper limb and the environment. Lower limb muscles respond rapidly to these postural disturbances in a highly specific manner. We have shown that the muscle activation patterns of lower limb muscles are organized in a direction specific manner which changes with lower limb stability. Ankle muscles change their activity within 80 ms of the onset of a force perturbation applied to the hand which is earlier than the onset of changes in ground reaction force, ankle angle or head motion...
2017: PloS One
https://www.readbyqxmd.com/read/29090314/biological-motion-cues-aid-identification-of-self-motion-from-optic-flow-but-not-heading-detection
#13
Hugh Riddell, Markus Lappe
When we move through the world, a pattern of expanding optic flow is generated on the retina. In completely rigid environments, this pattern signals one's direction of heading and is an important source of information for navigation. When we walk towards an oncoming person, the optic environment is not rigid, as the motion vectors generated by the other person represent a composite of that person's movement, his or her limb motion, and the observer's self-motion. Though this biological motion obfuscates the optic flow pattern, it also provides cues about the movement of other actors in the environment...
October 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/29060803/analysis-of-muscle-activation-in-lower-extremity-for-static-balance
#14
Kingshuk Chakravarty, Debatri Chatterjee, Rajat Kumar Das, Soumya Ranjan Tripathy, Aniruddha Sinha
Balance plays an important role for human bipedal locomotion. Degeneration of balance control is prominent in stroke patients, elderly adults and even for majority of obese people. Design of personalized balance training program, in order to strengthen muscles, requires the analysis of muscle activation during an activity. In this paper we have proposed an affordable and portable approach to analyze the relationship between the static balance strategy and activation of various lower extremity muscles. To do that we have considered Microsoft Kinect XBox 360 as a motion sensing device and Wii balance board for measuring external force information...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29046173/effects-of-physical-driving-experience-on-body-movement-and-motion-sickness-during-virtual-driving
#15
Chih-Hui Chang, Fu-Chen Chen, Wei-Ching Kung, Thomas A Stoffregen
BACKGROUND: In previous research on motion sickness in simulated and virtual vehicles, subjects' experience controlling the corresponding physical vehicles has been confounded with their age. During driving of virtual automobiles in a video game, we separated chronological age from experience driving physical automobiles. METHODS: Subjects drove a virtual automobile in a driving video game. Drivers were young adults with several years of experience driving physical automobiles, while nondrivers were individuals in the same age group who did not have a driver's license and had never driven an automobile...
November 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/29038740/reverse-fosbury-flop-tear-of-the-rotator-cuff
#16
Jérôme Tirefort, Gregory Cunningham, Alexandre Lädermann
INTRODUCTION: "Fosbury flop" tear is an avulsion of the posterosuperior rotator cuff from the bone with reversal healing on its medial bursal-side. This case report describes a unique variant of Fosbury flop tear with a lesion of the musculotendinous junction that healed, for its tendon part, on the anterior humerus and coracoid process. CASE PRESENTATION: A 62-year-old man developed a posttraumatic painful shoulder with active loss of range of motion. Magnetic resonance arthrography demonstrated a lesion of the musculotendinous junction of the supraspinatus with healing of the tendon on the above-mentioned structures (reverse Fosbury flop)...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28988233/sensing-external-and-self-motion-with-hair-cells-a-comparison-of-the-lateral-line-and-vestibular-systems-from-a-developmental-and-evolutionary-perspective
#17
Boris P Chagnaud, Jacob Engelmann, Bernd Fritzsch, Joel C Glover, Hans Straka
Detection of motion is a feature essential to any living animal. In vertebrates, mechanosensory hair cells organized into the lateral line and vestibular systems are used to detect external water or head/body motion, respectively. While the neuronal components to detect these physical attributes are similar between the two sensory systems, the organizational pattern of the receptors in the periphery and the distribution of hindbrain afferent and efferent projections are adapted to the specific functions of the respective system...
2017: Brain, Behavior and Evolution
https://www.readbyqxmd.com/read/28987866/kinematic-patterns-in-normal-and-degenerative-shoulders-part-ii-review-of-3-d-scapular-kinematic-patterns-in-patients-with-shoulder-pain-and-clinical-implications
#18
REVIEW
Marie-Martine Lefèvre-Colau, Christelle Nguyen, Clemence Palazzo, Frederic Srour, Guillaume Paris, Valerie Vuillemin, Serge Poiraudeau, Agnes Roby-Brami, Alexandra Roren
BACKGROUND: The global range of motion of the arm is the result of a coordinated motion of the shoulder complex including glenohumeral (GH), scapulothoracic, sternoclavicular and acromioclavicular joints. METHODS: This study is a non-systematic review of kinematic patterns in degenerated shoulders. It is a based on our own research on the kinematics of the shoulder complex and clinical experience. RESULTS: For patients with subacromial impingement syndrome without rotator-cuff tears, most kinematic studies showed a small superior humeral translation relative to the glenoid and decreased scapular lateral rotation and posterior tilt...
October 5, 2017: Annals of Physical and Rehabilitation Medicine
https://www.readbyqxmd.com/read/28968473/fracture-severity-based-on-classification-does-not-predict-outcome-following-proximal-humerus-fracture
#19
Nina D Fisher, James M Barger, Adam S Driesman, Rebekah Belayneh, Sanjit R Konda, Kenneth A Egol
This study was conducted to determine whether proximal humerus fracture patterns as defined by the Orthopaedic Trauma Association (AO/OTA) classification and the Neer 4-part system predicted functional outcomes for patients treated with open reduction and internal fixation with locked plates and, if so, which system correlated better with outcomes. During a 12-year period, 213 patients with a displaced proximal humerus fracture who underwent surgical treatment with a locking plate at 1 academic institution were prospectively followed...
October 2, 2017: Orthopedics
https://www.readbyqxmd.com/read/28967445/the-adult-monteggia-fracture-patterns-and-incidence-of-annular-ligament-incarceration-among-121-cases-at-a-single-institution-over-19-years
#20
Max Hamaker, Amy Zheng, W Andrew Eglseder, Raymond A Pensy
PURPOSE: The purposes of this study were to identify the relative frequency of Monteggia fracture patterns and to investigate the required frequency of open reduction of the proximal radiocapitellar joint. METHODS: We identified 121 Monteggia fractures at a Level I trauma center from 1996 to 2015 and included 119 in this study. These fractures were identified using a database search for the appropriate International Classification of Diseases, Ninth Revision and Current Procedural Terminology codes as well as individual surgeons' logs...
September 26, 2017: Journal of Hand Surgery
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