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https://www.readbyqxmd.com/read/28539881/the-influence-of-mexican-hat-recurrent-connectivity-on-noise-correlations-and-stimulus-encoding
#1
Robert Meyer, Josef Ladenbauer, Klaus Obermayer
Noise correlations are a common feature of neural responses and have been observed in many cortical areas across different species. These correlations can influence information processing by enhancing or diminishing the quality of the neural code, but the origin of these correlations is still a matter of controversy. In this computational study we explore the hypothesis that noise correlations are the result of local recurrent excitatory and inhibitory connections. We simulated two-dimensional networks of adaptive spiking neurons with local connection patterns following Gaussian kernels...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28532928/iris-suture-fixation-push-knot-needle
#2
Fei Liu, Qiang Zhou, Charles Q Yu, Victor Guaiquil, Yu Geng, Xiaodong Chen, Mark I Rosenblatt
We describe a technique to create a locking knot for iris reconstruction or intraocular lens fixation. A modified needle is prepared by straightening the tip of an ophthalmic viscosurgical device needle or a lacrimal cannula needle. After the suture is passed through 2 sides of an iris defect, the 2 ends are externalized and looped. One strand is then inserted into the needle from the tip out of the ferrule, and the knot is pushed into the anterior chamber by this needle in a controllable manner. Two other locking knots are then made by repeating the process...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28529869/septic-arthritis-of-the-shoulder-with-proximal-humerus-osteomyelitis-treated-by-ilizarov-shoulder-arthrodesis
#3
John Kendall, Martin McNally
Septic arthritis of the shoulder can destroy the glenohumeral joint resulting in significant pain, instability and poor function. Surgical treatment is notoriously difficult with significant risk of complications. Shoulder arthrodesis has been performed using both internal and external fixation but has high complication rates in the presence of infection. We present our experience of managing a patient with significant pain and loss of function as a result of septic arthritis of the shoulder following infected proximal humeral fracture fixation with associated proximal humeral osteomyelitis...
2017: J Bone Jt Infect
https://www.readbyqxmd.com/read/28522207/outcomes-of-post-traumatic-tibial-osteomyelitis-treated-with-an-orthofix-lrs-versus-an-ilizarov-external-fixator
#4
Yilizati Yilihamu, Ajimu Keremu, Alimujiang Abulaiti, Xiayimaierdan Maimaiti, Peng Ren, Aihemaitijiang Yusufu
OBJECTIVE: To compare the therapeutic effects of the Orthofix limb reconstruction system (LRS) versus the Ilizarov external fixator on osteomyelitis of a tibial bone defect. MATERIALS AND METHODS: Among 153 patients hospitalized for bone lengthening therapy from January 1, 1996 to January 1, 2015, 129 patients were selected for a retrospective analysis. Forty-three of the candidate patients were treated using the Orthofix LRS and the other 86 were treated using an Ilizarov external fixator...
May 3, 2017: Injury
https://www.readbyqxmd.com/read/28520685/pelvic-fracture-pattern-predicts-the-need-for-hemorrhage-control-intervention-results-of-an-aast-multi-institutional-study
#5
Todd W Costantini, Raul Coimbra, John B Holcomb, Jeanette M Podbielski, Richard D Catalano, Allie Blackburn, Thomas M Scalea, Deborah M Stein, Lashonda Williams, Joseph Conflitti, Scott Keeney, Christy Hoey, Tianhua Zhou, Jason Sperry, Dimitra Skiada, Kenji Inaba, Brian H Williams, Joseph P Minei, Alicia Privette, Robert C Mackersie, Brenton R Robinson, Forrest O Moore
BACKGROUND: Early identification of patients with pelvic fractures at risk of severe bleeding requiring intervention is critical. We performed a multi-institutional study to test our hypothesis that pelvic fracture patterns predict the need for a pelvic hemorrhage control intervention. METHODS: This prospective, observational, multicenter study enrolled patients with pelvic fracture due to blunt trauma. Inclusion criteria included shock on admission (systolic blood pressure <90 mm Hg or heart rate >120 beats/min and base deficit >5, and the ability to review pelvic imaging)...
June 2017: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28514314/infected-tibia-defect-fractures-treated-with-the-masquelet-technique
#6
Julia Mühlhäusser, Jörg Winkler, Reto Babst, Frank J P Beeres
The treatment after open and infected fractures with extensive soft tissue damage and bone deficit remains a challenging clinical problem. The technique described by Masquelet, using a temporary cement spacer to induce a membrane combined with reconstructive soft tissue coverage, is a possible solution. This study describes the work-up, operative procedure, complications, and the outcome of a homogenous group of patients with an open and infected tibia fracture and segmental bone loss treated with the Masquelet technique (MT)...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28513473/a-density-functional-approach-to-ferrogels
#7
Peet Cremer, Marco Heinen, Andreas Menzel, Hartmut Lowen
Ferrogels consist of magnetic colloidal particles embedded in an elastic polymer matrix. As a consequence, their structural and rheological properties are governed by a competition between magnetic particle-particle interactions and mechanical matrix elasticity. Typically the particles are permanently fixed within the matrix, which makes them distinguishable by their positions. Over time, particle neighbors do not change due to the fixation by the matrix. Here we present a classical density functional approach for such ferrogels...
May 17, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28508917/dowel-pinning-for-metacarpal-and-metatarsal-fractures-in-dogs
#8
Matthias Kornmayer, Ulrike Matis
OBJECTIVE: To evaluate a dowel pinning technique for metacarpal and metatarsal fractures in dogs. MATERIAL AND METHODS: Medical records of 13 dogs with complete clinical and radiographic follow-up examinations after a median observation time of 5 months were evaluated retrospectively. Assessment included fracture data, number of stabilized bones versus number of fractured bones and parameters of internal fixation including postoperative axial alignment and position of implants assessed on serial radiographs...
May 16, 2017: Tierärztliche Praxis. Ausgabe K, Kleintiere/Heimtiere
https://www.readbyqxmd.com/read/28507965/posterior-hip-dislocation-with-ipsilateral-femoral-head-and-shaft-fracture-using-a-temporary-external-fixator-as-a-method-for-closed-reduction
#9
Abduljabbar Alhammoud, Masson Alnouri, Mahmood Ali Arbash, Abdul Moeen Baco
INTRODUCTION: Complex fractures are increasing because of various traumatic mechanisms. They drift from standard classifications, and their treatment is controversial. Of such cases are hip dislocations with associated fractures of the ipsilateral femur. CASE REPORT: This case report describes the condition of a 30-year-old man involved in a motor vehicle collision. Clinical examination, X-rays, and computed tomography scan revealed a posterior hip dislocation with an ipsilateral femoral head and mid-shaft fractures...
November 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28506082/novel-use-of-active-leptospermum-honey-for-ringed-fixator-pin-site-care-in-diabetic-charcot-deformity-patients
#10
Alexander L Lazarides, Kamran S Hamid, Michael S Kerzner
INTRODUCTION: Open reduction with external fixation (OREF) utilizing fine wire ringed fixators for correction of Charcot deformity has gained popularity over the past decade. Pin site infections are a well-documented complication of external fixation as well as a driver of escalating health care costs. We aimed to demonstrate the safety and efficacy of a novel method of pin site care utilizing active Leptospermum honey-impregnated dressings (MediHoney) in diabetic patients undergoing deformity correction with OREF...
May 1, 2017: Foot & Ankle Specialist
https://www.readbyqxmd.com/read/28504809/effect-of-lymphedema-treatment-for-management-of-acute-pilon-fractures
#11
John M Whatley, James A Lalonde, Craig C Greene, Kevin B Riche, Danielle M Tatum
Pilon fractures are high-energy injuries that often result in considerable edema and compromise of the soft tissue envelope of the ankle. These injuries are typically staged with an external fixator until the soft tissue is amenable for definitive fixation. This study was conducted to determine the effects of lymphedema treatment for the management of pilon fractures. Patients who underwent open reduction and internal fixation of pilon fractures between 2007 and 2014 at the authors' level II trauma center were identified by Current Procedural Terminology codes indicative of placement of an external fixator (20690) and open reduction and internal fixation of a pilon fracture (27826, 27827, or 27828)...
May 15, 2017: Orthopedics
https://www.readbyqxmd.com/read/28503290/use-of-the-suprapatellar-approach-in-intramedullary-nailing-of-a-multi-fragmentary-dislocated-tibia-fracture-with-a-hypermobile-intermediate-fragment-in-a-young-patient
#12
Patrick Haubruck, Ulf Brunnemer, Arash Moghaddam, Gerhard Schmidmaier
A case of an adolescent female patient who suffered from first grade open multi-fragment fracture of the tibia (AO42-C2) with a large hypermobile intermediate fragment is presented in this case report. Intramedullary nailing of the tibia remains the treatment of choice despite a high risk of malformation and anterior knee pain especially in multi-fragment fractures. Here the suprapatellar approach as a semiextended nailing technique seems favorable. The specialty in our case was an early change of procedures necessary due to persistent swelling during external fixation based on the hypermobile intermediate fragment...
November 17, 2016: Orthopedic Reviews
https://www.readbyqxmd.com/read/28502686/customized-polymethylmethacrylate-cranioplasty-implants-using-3d-printed-polylactic-acid-molds-technical-note-with-2-illustrative-cases
#13
Joe Abdel Hay, Tarek Smayra, Ronald Moussa
OBJECTIVE: Prefabricated customized cranioplasty implants are anatomically more accurate than manually shaped acrylic implants but remain costly. The authors describe a new cost-effective technique of producing customized polymethylmethacrylate (PMMA) cranioplasty implants using prefabricated 3D printed molds. METHODS: The first patient had a left frontal cranial defect following a craniotomy for a glial tumor. A 3D image of his skull was obtained from axial 0.6mm computed tomography (CT) scan images...
May 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28500371/the-silhouette-technique-improving-post-operative-radiographs-for-planning-of-correction-with-a-hexapod-external-fixator
#14
Jonathan Wright, Shiraz A Sabah, Shelain Patel, Gavin Spence
Correction of deformity of a bone through use of a hexapod external fixator requires clear definition of the relationship between the bone and the frame. Achieving adequate orthogonal calibrated radiographs for this aim, with minimum X-ray exposure, can prove a challenge in the radiography suite. We describe a simple technique for obtaining adequate imaging, without the use of additional equipment. Introduction of the technique to our department has demonstrated an improvement in the adequacy of planning radiographs and a reduction in the requirement for repeat imaging...
May 12, 2017: Strategies in Trauma and Limb Reconstruction
https://www.readbyqxmd.com/read/28499465/current-treatment-of-infected-non-union-after-intramedullary-nailing
#15
H Simpson, S T J Tsang
Non-union is a devastating consequence of a fracture. Non-unions cause substantial patient morbidity with patients suffering from loss of function of the affected extremity, increased pain, and a substantial decrease in the quality of life. The management is often associated with repeated, unsuccessful operations resulting in prolonged hospital stays, which has social and economic consequences to both the patient and the healthcare system. The rates of non-union following intramedullary (IM) nailing vary according to anatomical location...
May 9, 2017: Injury
https://www.readbyqxmd.com/read/28495021/damage-control-and-intramedullary-nailing-for-long-bone-fractures-in-polytrauma-patients
#16
Peter Patka
The early fracture treatment in patients with multiple injuries should be focused on damage control. The fracture type and its location, local soft tissue condition as well as the patient's physiological condition shall determine the time and type of fracture treatment. Prevention of local and systemic complications must be immediately considered and included in the treatment planning. The use of external fixator (ExFix), which will be replaced by IM-implants in most cases at a later stage, provides adequate temporary fracture stabilization with less collateral damage...
May 7, 2017: Injury
https://www.readbyqxmd.com/read/28491460/correlation-between-retinal-function-and-microstructural-foveal-changes-in-intermediate-age-related-macular-degeneration
#17
Serena Fragiotta, Carmela Carnevale, Alessandro Cutini, Enzo Maria Vingolo
PURPOSE: To assess foveal microstructural changes influencing retinal sensitivity (RS) and fixation stability using microperimeter MP-1 in intermediate age-related macular degeneration (AMD). METHODS: In this cross-sectional study, 22 eyes of 22 patients (mean age: 75 ± 9.02 years) with intermediate AMD were enrolled. Retinal sensitivity and bivariate contour ellipse area (BCEA) were obtained by microperimetry MP-1 (Humphrey 10-2 68-loci grid) under mesopic conditions...
2017: International Journal of Retina and Vitreous
https://www.readbyqxmd.com/read/28489628/lengthening-of-newly-formed-humerus-after-autologous-fibula-graft-transplantation-following-intercalary-tumor-resection
#18
Hakan Pilge, Martin Ruppert, Bernd Bittersohl, Bettina Westhoff, Rüdiger Krauspe
Secondary limb lengthening after intercalary bone resection in pediatric patients is still challenging. After the resection, a free fibula autograft can be used to reconstruct the osseous gap. However, in particular in young pediatric patients, insufficient growth of the epiphyseal plate after transplantation may lead to a significant limb-length discrepancy (LLD). In this case, the autograft was used for limb lengthening. We report on the lengthening of a humerus regenerate after fibula autograft transplantation into a humeral defect in a pediatric/young adolescent patient...
May 5, 2017: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/28487102/treatment-of-aseptic-non-union-after-intramedullary-nailing-without-removal-of-the-nail
#19
Christos Garnavos
Failure of bone healing after intramedullary nailing of a diaphyseal long bone fracture is a severe complication that requires an effective management to ensure the best chances for successful bone-union and termination of a long period of incapacity and morbidity for the sufferers. Traditional procedures require removal of the existing nail and re-fixation with wider nail, plate or external fixation constructs. The concept that bone union can be obtained with the existing nail in situ is gaining popularity as its removal adds trauma and potential complications and prolongs the operating time...
May 6, 2017: Injury
https://www.readbyqxmd.com/read/28486284/transitioning-to-an-intramedullary-lengthening-and-compression-nail
#20
Austin T Fragomen
The magnetic intramedullary lengthening nail is an innovative technology that allows for creative ways to treat difficult problems. The lengthening option has revolutionized femur fracture management with bone loss and malunion therapy. The compression version of this nail has provided a gradual method to compress nonunions and difficult fractures that may obviate the need for many current uses of external fixation. Three cases are presented in this manuscript demonstrating a new paradigm in the management of bone loss/shortening of the tibia and femur, and recalcitrant nonunions...
June 2017: Journal of Orthopaedic Trauma
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