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https://www.readbyqxmd.com/read/28093561/homeostatic-plasticity-mechanisms-in-mouse-v1
#1
REVIEW
Megumi Kaneko, Michael P Stryker
Mechanisms thought of as homeostatic must exist to maintain neuronal activity in the brain within the dynamic range in which neurons can signal. Several distinct mechanisms have been demonstrated experimentally. Three mechanisms that act to restore levels of activity in the primary visual cortex of mice after occlusion and restoration of vision in one eye, which give rise to the phenomenon of ocular dominance plasticity, are discussed. The existence of different mechanisms raises the issue of how these mechanisms operate together to converge on the same set points of activity...
March 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28093560/integrating-hebbian-and-homeostatic-plasticity-introduction
#2
Kevin Fox, Michael Stryker
Hebbian plasticity is widely considered to be the mechanism by which information can be coded and retained in neurons in the brain. Homeostatic plasticity moves the neuron back towards its original state following a perturbation, including perturbations produced by Hebbian plasticity. How then does homeostatic plasticity avoid erasing the Hebbian coded information? To understand how plasticity works in the brain, and therefore to understand learning, memory, sensory adaptation, development and recovery from injury, requires development of a theory of plasticity that integrates both forms of plasticity into a whole...
March 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28093552/integrating-hebbian-and-homeostatic-plasticity-the-current-state-of-the-field-and-future-research-directions
#3
REVIEW
Tara Keck, Taro Toyoizumi, Lu Chen, Brent Doiron, Daniel E Feldman, Kevin Fox, Wulfram Gerstner, Philip G Haydon, Mark Hübener, Hey-Kyoung Lee, John E Lisman, Tobias Rose, Frank Sengpiel, David Stellwagen, Michael P Stryker, Gina G Turrigiano, Mark C van Rossum
We summarize here the results presented and subsequent discussion from the meeting on Integrating Hebbian and Homeostatic Plasticity at the Royal Society in April 2016. We first outline the major themes and results presented at the meeting. We next provide a synopsis of the outstanding questions that emerged from the discussion at the end of the meeting and finally suggest potential directions of research that we believe are most promising to develop an understanding of how these two forms of plasticity interact to facilitate functional changes in the brain...
March 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28053039/complex-visual-motion-representation-in-mouse-area-v1
#4
Ganna Palagina, Jochen F Meyer, Stelios M Smirnakis
: Rodent visual cortex has a hierarchical architecture similar to that of higher mammals (Coogan and Burkhalter, 1993; Marshel et al., 2011; Wang et al., 2012). Although notable differences exist between the species in terms or receptive field sizes and orientation map organization (Dräger, 1975; Gattass et al., 1987; Van den Bergh et al., 2010), mouse V1 is thought to respond to local orientation and visual motion elements rather than to global patterns of motion, similar to V1 in higher mammals (Niell and Stryker, 2008; Bonin et al...
January 4, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28048545/we-de-207a-04-advances-in-radiological-neuro-endovascular-interventional-imaging
#5
S Rudin
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048454/we-de-207a-00-advances-in-image-guided-neurointerventions-clinical-pull-and-technology-push
#6
Jeffrey Siewerdsen, Rebecca Fahrig
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047800/we-de-207a-01-parallels-in-the-evolution-of-x-ray-angiographic-systems-and-devices-used-for-minimally-invasive-endovascular-therapy
#7
C Strother
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047144/we-de-207a-02-advances-in-cone-beam-ct-anatomical-and-functional-imaging-in-angio-suite-to-enable-one-stop-shop-stroke-imaging-workflow
#8
G Chen
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046482/we-de-207a-03-recent-advances-in-devices-used-in-neuro-interventions
#9
M Gounis
: 1. Parallels in the evolution of x-ray angiographic systems and devices used for minimally invasive endovascular therapy Charles Strother - DSA, invented by Dr. Charles Mistretta at UW-Madison, was the technology which enabled the development of minimally invasive endovascular procedures. As DSA became widely available and the potential benefits for accessing the cerebral vasculature from an endovascular approach began to be apparent, industry began efforts to develop tools for use in these procedures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28038883/orbital-fracture-repair-outcomes-with-preformed-titanium-mesh-implants-and-comparison-to-porous-polyethylene-coated-titanium-sheets
#10
Michelle Y Peng, Shannath L Merbs, Michael P Grant, Nicholas R Mahoney
BACKGROUND: Restoration of orbital volume after internal orbital fractures can prevent enophthalmos. A variety of allografts are commonly used including titanium mesh with and without porous polyethylene coating. Some controversy exists over the use of uncoated titanium mesh in the orbit. Newer products contoured to the three dimensional orbital anatomy aim to improve reestablishment of the complex orbital shape though studies of outcomes with their use are limited. METHODS: A retrospective chart review was performed to evaluate surgical outcomes in all patients who underwent orbital fracture repair with DePuy/Synthes titanium MatrixMIDFACE prefabricated implants (PFTi) as compared with porous polyethylene/titanium hybrid implants (PPETi) including Stryker Medpor Titan, MTB, and BTB implants...
December 3, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28009708/trunnion-corrosion-in-metal-on-polyethylene-total-hip-arthroplasty-a-case-series
#11
Sivashanmugam Raju, Karthikeyan Chinnakkannu, Mohan K Puttaswamy, Matthew J Phillips
INTRODUCTION: Modular total hip arthroplasty implants can help the operating surgeon reproduce the optimum limb length and offset; however, the modularity can lead to fretting and corrosion with associated metal-related problems. Although metal-on-metal bearings are often reported to have problems, recent case reports suggest that the problems can occur with any articulation, usually as a result of problems at the head/neck junction. METHODS: We retrospectively reviewed three cases of a specific implant combination with nontraumatic trunnion failure, with two cases presenting as acute complete dissociation of the femoral head from the neck...
December 22, 2016: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/27915405/long-term-functional-outcomes-and-knee-alignment-of-computer-assisted-navigated-total-knee-arthroplasty
#12
V Sardana, J M Burzynski, M Khan, N Stone, B S Weening, P K Zalzal
INTRODUCTION: This retrospective study examined the relationship between the mechanical axis throughout a functional arc of motion and functional outcome scores in patients undergoing computer-assisted navigation-based total knee arthroplasty (CAN-TKA) at 6-year follow-up. MATERIALS AND METHODS: The Stryker eNact Precision Knee Navigation System was utilized to obtain pre- and postoperative alignment measurements throughout the functional arc of motion. Patients were contacted via telephone and asked to complete the Short Form-12 and Western Ontario and McMaster Universities, which have been demonstrated to be reliable, valid, and sensitive assessment tools in this patient population...
December 3, 2016: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/27906843/comparison-of-resorbable-plating-systems-complications-during-degradation
#13
Dennis C Nguyen, Albert S Woo, Scott J Farber, Gary B Skolnick, Jenny Yu, Sybill D Naidoo, Kamlesh B Patel
INTRODUCTION: Several bioresorbable plating systems have become standard in pediatric craniosynostosis reconstruction. A comparison of these systems is needed to aid surgeons in the preoperative planning process. The authors aim to evaluate 1 institution's experience using Resorb-X by KLS Martin and Delta Resorbable Fixation System by Stryker (Stryker Craniomaxillofacial, Kalamazoo, MI). METHODS: A sample of patients with single-suture nonsyndromic craniosynostosis treated at St Louis Children's Hospital between 2007 and 2014 using either Resorb-X or Delta bioresorbable plating systems were reviewed...
November 30, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27886678/role-of-patellofemoral-offset-in-total-knee-arthroplasty-a-randomized-trial
#14
REVIEW
Louis S Stryker, Susan M Odum, Bryan D Springer, Thomas K Fehring
Total knee arthroplasty occasionally does not meet expectations. This randomized clinical trial assessed the effect of restoration of the native patellofemoral height on clinical outcomes. Group I underwent standard patellar bone resection; group II underwent modified patellar bone resection that adjusted the amount of anterior condylar bone removed and the anterior flange thickness. There were no differences in anterior knee pain, Western Ontario and McMaster Universities Arthritis Index scores, or Knee Injury and Osteoarthritis Outcome Score scores...
January 2017: Orthopedic Clinics of North America
https://www.readbyqxmd.com/read/27810321/safe-zone-for-transacetabular-screw-fixation-using-a-kerboull-cross-plate-a-ct-scan-templating-prospective-study
#15
T Ohmori, T Kabata, Y Kajino, K Hasegawa, D Inoue, H Tsuchiya
BACKGROUND: Implantation of Kerboull acetabular reinforcement cross-plates (Kerboull plate) carries a risk for injury to vascular structures and pelvic organs. To our knowledge, there is no study assessing anatomical assessment related to this risk with this specific design. Therefore, we performed a prospective study to answer the following four questions: 1) What is the minimum distance and angle between the plate and iliac vessels? 2) What is the distance between the plate and the inner cortex of the ilium? 3) What is the ratio of views with muscle tissue present on the inner surface of the ilium? 4) What are the boundaries of the safe zone for transacetabular screw fixation for a Kerboull plate? HYPOTHESIS: A safe zone for fixation screws would be defined by a narrow range of insertion angles...
December 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/27781667/peripheral-snap-fit-locking-mechanisms-and-smooth-surface-finish-of-tibial-trays-reduce-backside-wear-in-fixed-bearing-total-knee-arthroplasty
#16
Łukasz Łapaj, Adrian Mróz, Paweł Kokoszka, Jacek Markuszewski, Justyna Wendland, Celina Helak-Łapaj, Jacek Kruczyński
Background and purpose - Severe backside wear, observed in older generations of total knee replacements (TKRs), led to redesign of locking mechanisms to reduce micromotions between tibial tray and inlay. Since little is known about whether this effectively reduces backside wear in modern designs, we examined backside damage in retrievals of various contemporary fixed-bearing TKRs. Patients and methods - A consecutive series of 102 inlays with a peripheral (Stryker Triathlon, Stryker Scorpio, DePuy PFC Sigma, Aesculap Search Evolution) or dovetail locking mechanism (Zimmer NexGen, Smith and Nephew Genesis II) was examined...
February 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/27768219/head-neck-taper-corrosion-following-total-hip-arthroplasty-with-stryker-meridian-stem
#17
Sonika Patel, Carl T Talmo, Sumon Nandi
BACKGROUND: Taper corrosion at the modular junctions of total hip arthroplasty (THA) femoral stems are known to cause locally destructive adverse local tissue reaction (ALTR). However, the implants at risk remain to be fully elucidated. CASE REVIEW: We report the case of a 76-year-old woman with hip pain, abductor weakness, and sciatic nerve symptoms 2 years following metal-on-polyethylene THA. Serum cobalt levels were elevated, while chromium levels were normal...
November 10, 2016: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/27703932/acromioclavicular-joint-dislocation-with-ipsilateral-mid-third-clavicle-mid-shaft-humerus-and-coracoid-process-fracture-a-case-report
#18
Naveen Sharma, Avinash Mandloi, Ashish Agrawal, Shailendra Singh
INTRODUCTION: The clavicle, humerus and acromioclavicular (AC) joint separately are very commonly involved in traumatic injuries around the shoulder. Acromioclavicular joint dislocation with distal clavicle fracture is a well recognized entity in clinical practice. AC joint dislocation with mid shaft clavicle fracture is uncommon and only few cases have been reported in literature. However, to the best of our knowledge, this is the first case report to describe an acromioclavicular dislocation with ipsilateral mid shaft clavicle, mid shaft humerus and coracoid process fracture...
April 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/27682019/heat-generation-during-bone-drilling-a-comparison-between-industrial-and-orthopaedic-drill-bits
#19
Christopher Hein, Serkan Inceoglu, David Juma, Lee Zuckerman
OBJECTIVES: Cortical bone drilling for preparation of screw placement is common in multiple surgical fields. The heat generated while drilling may reach thresholds high enough to cause osteonecrosis. This can compromise implant stability. Orthopedic drill bits are several orders more expensive than their similarly sized, publicly available industrial counterparts. We hypothesize an industrial bit will generate less heat during drilling, and the bits will not generate more heat after multiple cortical passes...
September 24, 2016: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/27681814/serologic-and-radiographic-outcome-of-total-hip-arthroplasty-with-cocr-modular-neck-at-mid-term-follow-up
#20
M Chillemi, G Placella, A Caraffa, G Cerulli, P Antinolfi
PURPOSE: The aim of this study is a radiographic evaluation and to determine serologic values of chromium and cobalt in the blood and urine of patients who have been implanted with a Stryker(®) ABG II Modular Neck and see if there is correlation with the features of prosthesis and patients. METHODS: The study involves the collection of data from patients operated on for total hip model with the ABG II Modular Neck with a minimum follow-up of 1 year. RESULTS: We evaluated 22 patients who underwent implantation of a hip prosthesis with modular neck in CoCr...
September 28, 2016: Musculoskeletal Surgery
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