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https://www.readbyqxmd.com/read/28628800/increased-internal-femoral-torsion-can-be-regarded-as-a-risk-factor-for-patellar-instability-a-biomechanical-study
#1
Peter Kaiser, Werner Schmoelz, Philip Schoettle, Marit Zwierzina, Christian Heinrichs, Rene Attal
BACKGROUND: Increased internal femoral torsion is regarded as a risk factor for patellar instability. Biomechanical investigations confirming this hypothesis are missing. METHODS: Eight fresh-frozen cadaver knees were tested on a specially designed simulator. Patellar motion and patellofemoral pressure were evaluated for 0°, 10°, and 20° of increased internal and external femoral torsion with native and with transected medial patellofemoral ligaments used to simulate patellar instability...
June 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28628154/-morphological-changes-on-cochlear-hair-cells-of-rats-in-simulated-weightlessness-and-inboard-noise
#2
(no author information available yet)
OBJECTIVE: To observe the morphological changes on cochlear hair cells of rats in simulated weightlessness and inboard noise and to investigate the different changes in three turns of hair cells. METHODS: Thirty-two healthy SD rats, all males, were randomly divided into four groups: control group, weightlessness group, noise group and weightlessness+noise groups (n=8). Then rats were exposed to -30° head down tilt as simulated weightlessness and inboard noise including steady-state noise which was (72±2) dB SPL and impulse noise up to 160 dB SPL in spaceship environment...
June 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28624723/repeated-end-range-spinal-movement-while-seated-abolishes-the-proprioceptive-deficit-induced-by-prolonged-flexed-sitting-posture-a-study-assessing-the-statistical-and-clinical-significance-of-spinal-position-sense
#3
Vasileios Korakakis, Giannis Giakas, Vasilis Sideris, Rodney Whiteley
BACKGROUND: Sustained spinal flexion has been proposed to affect the properties of spinal tissues, increase postural muscle's activation latency and act detrimentally on proprioception. OBJECTIVES: This study evaluated the effect of flexed posture (FP) on spinal proprioception and assessed the immediate effect of spinal movement on the presumable flexion-induced proprioceptive deficit. DESIGN: Clinical measurement study. METHODS: Marker-based kinematic analyses of the head, spine, and pelvis were conducted on 50 individuals...
June 10, 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28622899/a-novel-method-for-estimating-three-dimensional-apical-vertebral-rotation-using-two-dimensional-coronal-cobb-angle-and-thoracic-kyphosis
#4
T Barrett Sullivan, Tracey Bastrom, Fredrick Reighard, Megan Jeffords, Peter O Newton
STUDY DESIGN: Retrospective cohort analysis. OBJECTIVES: To use a large cohort of three-dimensional (3D) spinal reconstructions to create a simple mathematical formula capable of estimating 3D apical vertebral rotation (AVR) based on the correlation with routinely obtained two-dimensional (2D) measurements of scoliosis. SUMMARY OF BACKGROUND DATA: Quantification of vertebral rotation in AIS using 2-dimensional (2D) imaging is inherently challenging as the axial plane cannot be directly visualized...
July 2017: Spine Deformity
https://www.readbyqxmd.com/read/28622314/development-of-a-simple-computerized-torsion-test-to-quantify-subjective-ocular-torsion
#5
Y D Kim, H K Yang, J-M Hwang
PurposeThe double Maddox-rod test (DMRT) and Lancaster red-green test (LRGT) are the most widely used tests worldwide to assess subjective ocular torsion. However, these tests require equipment and the quantified results of ocular torsion are only provided in rough values. Here we developed a novel computerized torsion test (CTT) for individual assessment of subjective ocular torsion and validated the reliability and accuracy of the test compared with those of the DMRT and LRGT.MethodsA total of 30 patients with cyclovertical strabismus and 30 controls were recruited...
June 16, 2017: Eye
https://www.readbyqxmd.com/read/28617840/a-new-test-for-diagnosing-vasovagal-syncope-standing-after-treadmill-test-with-sublingual-nitrate-administration
#6
Tae-Hoon Kim, Ho-Jun Jang, Sihun Kim, Sung Yun Cho, Kyung Sun Song, Christopher Pickett, Heiko J Schmitt, Juyong Lee
INTRODUCTION: Increased adrenergic tone might be an additional trigger of orthostatic stress of vasovagal syncope (VVS). Exercise before standing might provide increased sensitivity compared to standing using a sublingual nitroglycerines protocol during tilt table testing. The aim of this study was to evaluate the diagnostic value of treadmill testing before standing with nitroglycerin administration. METHODS AND RESULTS: A total of 36 patients with syncope or presyncope were enrolled for the test...
2017: PloS One
https://www.readbyqxmd.com/read/28616731/renal-nerve-stimulation-for-treatment-of-neurocardiogenic-syncope-a-review-from-perspective-of-commercialization-potential
#7
REVIEW
B O'Brien, H Zafar, F Sharif
A strong evidence of outcomes for vasovagal syncope is not easily identified. It would seem reasonable that the proposed Mayo Clinic technology would be reserved for cases with severe recurrent or refractory syncope. However, recurrence levels are relatively low, and while some predictive methods have been proposed, recurrence is also influenced by the interaction that occurs during screening and examinations, i.e. recurrence diminishes once an initial diagnosis has been made. Finally, a key factor in being able to identify suitable patients relates to understanding the relative significance of the vasodepression and cardioinhibitory components-the therapy is best suited to patients that have a significant level of both components...
June 14, 2017: Irish Journal of Medical Science
https://www.readbyqxmd.com/read/28607756/heart-rate-variability-is-differentially-altered-in-multiple-sclerosis-implications-for-acute-worsening-and-progressive-disability
#8
Valeria Studer, Camilla Rocchi, Caterina Motta, Benedetta Lauretti, Jacopo Perugini, Laura Brambilla, Lorena Pareja-Gutierrez, Giorgia Camera, Francesca Romana Barbieri, Girolama A Marfia, Diego Centonze, Silvia Rossi
BACKGROUND: Sympathovagal imbalance has been associated with poor prognosis in chronic diseases, but there is conflicting evidence in multiple sclerosis. OBJECTIVES: The objective of this study was to investigate the autonomic nervous system dysfunction correlation with inflammation and progression in multiple sclerosis. METHODS: Heart rate variability was analysed in 120 multiple sclerosis patients and 60 healthy controls during supine rest and head-up tilt test; the normalised units of low frequency and high frequency power were considered to assess sympathetic and vagal components, respectively...
April 2017: Multiple Sclerosis Journal—Experimental, Translational and Clinical
https://www.readbyqxmd.com/read/28604613/aspheric-surface-measurement-using-capacitive-sensors
#9
Daocheng Yuan, Huiying Zhao, Xin Tao, Shaobo Li, Xueliang Zhu, Chupeng Zhang
This paper proposes a new method for the measurement of spherical coordinates by using capacitive sensors as a non-contact probe solution of measurement of aspheric surfaces. The measurement of the average effect of the capacitive probe and the influence of capacitive probe tilting were studied with respect to an eccentric spherical surface. Based on the tested characteristic curve of the average effect of the sphere and probe, it was found that nonlinear and linear compensation resulted in high measurement accuracy...
June 11, 2017: Sensors
https://www.readbyqxmd.com/read/28604410/feasibility-and-neurobehavioral-changes-of-10-day-simulated-microgravity-in-acute-ischemic-stroke-patients
#10
Kyo-In Koo, Dae Kwon Park, Chang Ho Hwang
OBJECTIVE: The aim of the study was to investigate feasibility and functional changes of simulated microgravity with 6-degree head-down-tilt (HDT) bed rest in acute ischemic stroke. DESIGN: Patients without lesions in the cingulate cortex and/or cerebellum were enrolled. They underwent HDT for 30 minutes twice per day for 10 weekdays. Systolic blood pressure, diastolic blood pressure, and heart rate were measured before the HDT, immediately after, and also 30 minutes after the stop...
June 9, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28604343/breathing-100-oxygen-during-water-immersion-improves-postimmersion-cardiovascular-responses-to-orthostatic-stress
#11
John P Florian, Ki H Chon, Luca Faes, Barbara E Shykoff
Physiological compensation to postural stress is weakened after long-duration water immersion (WI), thus predisposing individuals to orthostatic intolerance. This study was conducted to compare hemodynamic responses to postural stress following exposure to WI alone (Air WI), hyperbaric oxygen alone in a hyperbaric chamber (O2 HC), and WI combined with hyperbaric oxygen (O2 WI), all at a depth of 1.35 ATA, and to determine whether hyperbaric oxygen is protective of orthostatic tolerance. Thirty-two healthy men underwent up to 15 min of 70° head-up tilt (HUT) testing before and after a single 6-h resting exposure to Air WI (N = 10), O2 HC (N = 12), or O2 WI (N = 10)...
December 2016: Physiological Reports
https://www.readbyqxmd.com/read/28602327/comparison-of-intraocular-lens-decentration-and-tilt-measurements-using-2%C3%A2-purkinje-meter-systems
#12
Sophie Maedel, Nino Hirnschall, Natascha Bayer, Sabine Markovic, Juan Tabernero, Pablo Artal, Frank Schaeffel, Oliver Findl
PURPOSE: To evaluate the difference in intraocular lens tilt and decentration measurements with 2 Purkinje meters. SETTING: Vienna Institute for Research in Ocular Surgery, Hanusch Hospital, Vienna, Austria. DESIGN: Prospective evaluation of diagnostic test. METHODS: This single-center study included pseudophakic patients in 2 substudies in which 3 consecutive measurements were performed with 2 Purkinje meters (Spanish and German)...
May 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28600534/intracranial-fluid-redistribution-but-no-white-matter-microstructural-changes-during-a-spaceflight-analog
#13
Vincent Koppelmans, Ofer Pasternak, Jacob J Bloomberg, Yiri E De Dios, Scott J Wood, Roy Riascos, Patricia A Reuter-Lorenz, Igor S Kofman, Ajitkumar P Mulavara, Rachael D Seidler
The neural correlates of spaceflight-induced sensorimotor impairments are unknown. Head down-tilt bed rest (HDBR) serves as a microgravity analog because it mimics the headward fluid shift and axial body unloading of spaceflight. We investigated focal brain white matter (WM) changes and fluid shifts during 70 days of 6° HDBR in 16 subjects who were assessed pre (2x), during (3x), and post-HDBR (2x). Changes over time were compared to those in control subjects (n = 12) assessed four times over 90 days. Diffusion MRI was used to assess WM microstructure and fluid shifts...
June 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28598949/subjective-visual-vertical-in-idiopathic-bilateral-vestibular-hypofunction-enhanced-role-of-vision-neck-and-body-proprioception
#14
Michel Toupet, Christian Van Nechel, Charlotte Hautefort, Ulla Duquesne, Sylvie Heuschen, Alexis Bozorg Grayeli
INTRODUCTION: We aimed to study the participation of proprioceptive and visual inputs in subjective visual vertical (SVV) in bilateral vestibular hypofunction and in normal subjects. STUDY DESIGN: Prospective case-control study. SETTING: Tertiary referral center. MATERIALS AND METHODS: SVV (six replicates) was measured on a tiltable rehabilitation seat in 26 adult patients with idiopathic bilateral vestibular hypofunction (IBVH) and 33 adult controls...
June 8, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28591075/comparison-of-the-vacuum-mattress-versus-the-spine-board-alone-for-immobilization-of-the-cervical-spine-injured-patient-a-biomechanical-cadaveric-study
#15
Mark L Prasarn, Per Kristian Hyldmo, Laura A Zdziarski, Evan Loewy, Dewayne Dubose, MaryBeth Horodyski, Glenn R Rechtine
STUDY DESIGN: Biomechanical cadaveric study. SUMMARY OF BACKGROUND DATA: Trauma patients in the United States are immobilized on a rigid spine board, whereas in many other places vacuum mattresses are used with the proposed advantages of improved comfort and better immobilization of the spine. OBJECTIVE: We sought to determine the amount of motion generated in an unstable cervical spine fracture with use of the vacuum mattress versus the spine board alone...
June 6, 2017: Spine
https://www.readbyqxmd.com/read/28586499/a-new-extended-depth-of-focus-intraocular-lens-based-on-spherical-aberration
#16
Roberto Bellucci, Maria C Curatolo
PURPOSE: To describe a new extended depth of focus intraocular lens (IOL) design offering multifocality by the variation of spherical aberration in the central optical zone. METHODS: The new IOL (Mini WELL; SIFI, Catania, Italy) is an aspheric IOL with positive spherical aberration in the central 2-mm zone and negative spherical aberration in the pericentral 1-mm annulus, the amount of which was determined by specific optic calculation. The new IOL design was tested at the optical bench to investigate depth of focus and sensitivity to tilt, decentration, and angle Kappa...
June 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28585146/deceleration-capacity-a-novel-measure-for-autonomic-nervous-system-in-patients-with-vasovagal-syncope-on-tilt-table-testing
#17
Fen Huang, Chun-Fang Xu, Xiao-Yan Deng, Ping Zuo, Fan Lin, Jing-Jing Fan, Wen-Jia Xu, Xiao-Yun Yang
This study was to investigate the changes of autonomic nerve function and hemodynamics in patients with vasovagal syncope (VVS) during head-up tilt-table testing (HUT). HUT was performed in 68 patients with unexplained syncope and 18 healthy subjects served as control group. According to whether bradycardia, hypotension or both took place during the onset of syncope, the patients were divided during the test into three subgroups: vasodepressor syncope (VD), cardioinhibitory syncope (CI) and mixed syncope (MX) subgroups...
June 2017: Journal of Huazhong University of Science and Technology. Medical Sciences
https://www.readbyqxmd.com/read/28582642/movement-of-the-sacroiliac-joint-during-the-active-straight-leg-raise-test-in-patients-with-long-lasting-severe-sacroiliac-joint-pain
#18
Thomas J Kibsgård, Stephan M Röhrl, Olav Røise, Bengt Sturesson, Britt Stuge
BACKGROUND: The Active Straight Leg Raise is a functional test used in the assessment of pelvic girdle pain, and has shown to have good validity, reliability and responsiveness. The Active Straight Leg Raise is considered to examine the patients' ability to transfer load through the pelvis. It has been hypothesized that patients with pelvic girdle pain lack the ability to stabilize the pelvic girdle, probably due to instability or increased movement of the sacroiliac joint. This study examines the movement of the sacroiliac joints during the Active Straight Leg Raise in patients with pelvic girdle pain...
May 29, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28579743/novel-positioning-sensor-with-real-time-feedback-for-improved-postoperative-positioning-pilot-study-in-control-subjects
#19
Frank L Brodie, David A Ramirez, Sundar Pandian, Kelly Woo, Ashwin Balakrishna, Eugene De Juan, Hyuck Choo, Robert H Grubbs
INTRODUCTION: Repair of retinal detachment frequently requires use of intraocular gas. Patients are instructed to position themselves postoperatively to appose the intraocular bubble to the retinal break(s). We developed a novel wearable wireless positioning sensor, which provides real-time audiovisual feedback on the accuracy of positioning. METHODS: Eight healthy volunteers wore the wireless sensor for 3 hours while instructed to maintain their head tilted toward the 2 o'clock meridian with no audiovisual feedback...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28577333/mri-based-assessment-of-acute-effect-of-head-down-tilt-position-on-intracranial-hemodynamics-and-hydrodynamics
#20
Shota Ishida, Tosiaki Miyati, Naoki Ohno, Shinnosuke Hiratsuka, Noam Alperin, Mitsuhito Mase, Toshifumi Gabata
PURPOSE: To quantify the acute effect of the head-down tilt (HDT) posture on intracranial hemodynamics and hydrodynamics. MATERIALS AND METHODS: We evaluated the intracranial physiological parameters, blood flow-related parameters, and brain morphology in the HDT (-6° and -12°) and the horizontal supine (HS) positions. Seven and 15 healthy subjects were scanned for each position using 3.0 T magnetic resonance imaging system. The peak-to-peak intracranial volume change, the peak-to-peak cerebrospinal fluid (CSF) pressure gradient (PGp-p ), and the intracranial compliance index were calculated from the blood and CSF flow determined using a cine phase-contrast technique...
June 3, 2017: Journal of Magnetic Resonance Imaging: JMRI
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