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https://www.readbyqxmd.com/read/29025900/multiple-coupled-resonances-in-the-human-vascular-tree-refining-the-westerhof-model-of-the-arterial-system
#1
Gerhard Schumacher, Jens J Kaden, Frederik Trinkmann
The human arterial vascular tree can be described by multi-compartment models using electrical components. Being first introduced in the 1960s by Noordergraaf and Westerhof these hardware-based approaches required several simplifications. We were able to remove the restrictions using modern software simulation tools and improve overall model quality considerably. While the original Westerhof model consisted of 121 Windkessel elements, the refined model has 711 elements and gives realistic pulse waveforms of the aorta, brachial and radial arteries with realistic blood pressures...
October 12, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28988807/increased-risk-for-complications-following-removal-of-hardware-in-patients-with-liver-disease-pilon-or-pelvic-fractures-a-regression-analysis
#2
Bryan D Brown, Justin N Steinert, John W Stelzer, Richard S Yoon, Joshua R Langford, Kenneth J Koval
PURPOSE: Indications for removing orthopedic hardware on an elective basis varies widely. Although viewed as a relatively benign procedure, there is a lack of data regarding overall complication rates after fracture fixation. The purpose of this study is to determine the overall short-term complication rate for elective removal of orthopedic hardware after fracture fixation and to identify associated risk factors. MATERIALS AND METHODS: Adult patients indicated for elective hardware removal after fracture fixation between July 2012 and July 2016 were screened for inclusion...
October 3, 2017: Injury
https://www.readbyqxmd.com/read/28985691/comparative-outcomes-between-step-cut-lengthening-calcaneal-osteotomy-vs-traditional-evans-osteotomy-for-stage-iib-adult-acquired-flatfoot-deformity
#3
Stuart M Saunders, Scott J Ellis, Constantine A Demetracopoulos, Anca Marinescu, Jayme Burkett, Jonathan T Deland
BACKGROUND: The forefoot abduction component of the flexible adult-acquired flatfoot can be addressed with lengthening of the anterior process of the calcaneus. We hypothesized that the step-cut lengthening calcaneal osteotomy (SLCO) would decrease the incidence of nonunion, lead to improvement in clinical outcome scores, and have a faster time to healing compared with the traditional Evans osteotomy. METHODS: We retrospectively reviewed 111 patients (143 total feet: 65 Evans, 78 SLCO) undergoing stage IIB reconstruction followed clinically for at least 2 years...
October 1, 2017: Foot & Ankle International
https://www.readbyqxmd.com/read/28974847/tubular-vs-profile-plate-in-peroneal-or-bimalleolar-fractures-is-there-a-real-difference-in-skin-complication-a-retrospective-study-in-three-level-i-trauma-center
#4
Rosario Petruccelli, Michele Bisaccia, Giuseppe Rinonapoli, Giuseppe Rollo, Luigi Meccariello, Gabriele Falzarano, Paolo Ceccarini, Olga Bisaccia, Marco Giaracuni, Auro Caraffa
INTRODUCTION: Not enough literature is available to evalute the wound complication rate of plates type in distal fibular fractures. AIM: The aim of our study was to compare wound complications of using a third tubular plate compared to LCP distal fibula plate. MATERIAL AND METHODS: This study is a retrospective single-centre study in which was performed plating of fibula in closed ankle fractures. 93 patients were included in our study and assigned in two groups, based on using of different implant : in group A 48 patients were treated with one-third tubular and in group B 45 patients were treated with LCP distal fibula plate...
August 2017: Medical Archives
https://www.readbyqxmd.com/read/28970989/crossing-suture-technique-for-the-osteochondral-fractures-repair-of-patella
#5
Wuey Min Ng, Mohamed Zubair Mohamed Al-Fayyadh, Julius Kho, Teo Seow Hui, Mohamed Razif Bin Mohamed Ali
Osteochondral fracture of the patella is a common concomitant injury of the knee, especially in lateral patellar instability, and the importance of early stable fixation with minimal complication and early mobilization should be emphasized. Screws and Kirschner wires both absorbable and nonabsorbable have been the common mode of fixation of these fractures. Nevertheless, these fixation techniques require larger osteochondral fragments and are associated with cartilage abrasion, hardware prominence, synovitis, and foreign body reaction...
August 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28970960/risk-factors-of-surgical-site-infections-in-instrumented-spine-surgery
#6
M Dobran, A Marini, D Nasi, M Gladi, V Liverotti, M Della Costanza, F Mancini, M Scerrati
BACKGROUND: The incidence of wound infections associated with instrumented spine surgery ranges from 2 to 20%. These complications may lead to poor outcomes. Knowing the risk factors associated with surgical site infections (SSI) after utilizing spinal implants is essential to avoid these complications, including hardware removal. METHODS: We reviewed retrospectively 550 patients who underwent spinal fusion surgery from 2011 to 2015; 16 developed SSI after spinal instrumentation...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28964674/single-lateral-versus-medial-and-lateral-plates-for-treating-displaced-scapular-body-fractures-a-retrospective-comparative-study
#7
Rongguang Ao, Baoqing Yu, Yalong Zhu, Xinhua Jiang, Jifei Shi, Jianhua Zhou
BACKGROUND: This study compared the outcomes and complications of single lateral plating vs. dual plating for treating displaced scapular body fractures. METHODS: Open reduction and internal fixation using locking plates was performed in 45 patients with displaced scapular fractures. A single lateral plate fixed in the lateral border was used in 22 patients (group A), and dual plates fixed in both the lateral and medial borders were used in 23 (group B). RESULTS: The average follow-up duration in both groups was 20 months...
September 27, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28962089/surgical-outcome-of-simplified-horse-shoe-technique-with-the-traditional-procedure-in-children-with-trigonocephaly
#8
Abdoljalil Kalantar Hormozi, Vahid Dastgerdi, Abdolazim Ghalambor
Trigonocephaly is one of the most common types of craniosynostosis leading to triangular-shaped head and neurodevelopmental complications. Several surgical techniques have been suggested for its correction, but the newly suggested technique seems to have optimal outcomes compared with the traditional methods. Thus, the authors retrospectively evaluated the outcomes of the simplified horse-shoe technique with previous procedures performed on 169 children severe trigonocephaly during 1996 to 2015 at Mofid Hospital, Tehran, Iran...
October 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28958215/periprosthetic-total-knee-fracture-after-remote-reconstruction-of-the-anterior-cruciate-ligament-a-case-report
#9
Sahil Kooner, Eric Gibson, Marcia Clark
BACKGROUND: Distal femoral fracture is a rare, but significant, postoperative complication of anterior cruciate ligament reconstruction. However, there has not been a reported case of periprosthetic total knee arthroplasty fracture associated with a previous anterior cruciate ligament repair. CASE PRESENTATION: We report the case of a 51-year-old white man with a history of total knee arthroplasty and remote anterior cruciate ligament reconstruction, who presented with a distal femoral periprosthetic fracture at the site of a previous anterior cruciate ligament augmentation staple...
September 29, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28956142/exchange-nailing-with-enhanced-distal-fixation-is-effective-for-the-treatment-of-infraisthmal-femoral-nonunions
#10
Joon-Woo Kim, Yong-Cheol Yoon, Chang-Wug Oh, Seung-Beom Han, Jae-Ang Sim, Jong-Keon Oh
INTRODUCTION: The treatment options for nonunions of infraisthmal femoral shaft fractures after internal fixation are controversial. Methods such as exchanging an existing nail with a nail of a larger size, dynamization, removal of the nail followed by plating, and bone grafting have all been reported. Among those options, exchange nailing seems to be the most popular choice. In this study, a Poller screw, or an additional interlocking screw, was used in conjunction with exchange intramedullary nailing...
September 27, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28951646/inpatient-orthopaedic-hardware-removal-in-children-a-cross-sectional-study
#11
Alexandre Boulos, Steven F DeFroda, Justin E Kleiner, Nathan Thomas, Joseph A Gil, Aristides I Cruz
INTRODUCTION: Few data describe the specific reasons for inpatient hardware removal in the pediatric population. This study was designed to understand the conditions necessitating inpatient removal following fracture surgery. Cost data was analyzed to understand the financial implications of these procedures. METHODS: The Kids' Inpatient Database (KID) was evaluated for the year 2012. Patients undergoing open reduction internal fixation following upper and lower extremity fractures as well as those undergoing hardware removal due to hardware complications were identified using ICD-9 CM diagnosis and procedure codes...
July 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28946651/hardware-in-the-loop-performance-assessment-of-lidar-based-spacecraft-pose-determination
#12
Roberto Opromolla, Giancarmine Fasano, Giancarlo Rufino, Michele Grassi
In this paper an original, easy to reproduce, semi-analytic calibration approach is developed for hardware-in-the-loop performance assessment of pose determination algorithms processing point cloud data, collected by imaging a non-cooperative target with LIDARs. The laboratory setup includes a scanning LIDAR, a monocular camera, a scaled-replica of a satellite-like target, and a set of calibration tools. The point clouds are processed by uncooperative model-based algorithms to estimate the target relative position and attitude with respect to the LIDAR...
September 24, 2017: Sensors
https://www.readbyqxmd.com/read/28945691/should-proximal-femoral-implants-be-removed-prophylactically-or-reactively-in-children-with-cerebral-palsy
#13
Walter H Truong, Susan A Novotny, Tom F Novacheck, Eyun-Jung Shin, Andrew Howard, Unni G Narayanan
BACKGROUND: Implants are commonly used to stabilize proximal femoral osteotomies in children with cerebral palsy (CP). Removal of implants is common practice and believed to avoid infection, fracture, or pain that might be associated with retained hardware. There is little evidence to support a prophylactic strategy over a reactive approach based on symptoms. The aim of this study was to compare the outcomes of prophylactic and reactive approaches to removal of proximal femoral implants in children with CP...
September 22, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28941376/is-the-three-dimensional-strut-plate-an-adequate-fixation-technique-for-mandibular-symphysis-fractures
#14
Andrew T Meram, Sergio Olate, Celso F Palmieri
PURPOSE: We present a series of cases of mandibular symphysis fractures treated at our institution with a 3-dimensional strut plate. The aim of the present study was to confirm the stability of this fixation technique and discuss its advantages, disadvantages, and potential complications. PATIENTS AND METHODS: We designed and implemented a retrospective cohort study of patients who underwent surgery by the same surgeon at our institution from July 2012 to April 2014 for a mandible fracture with a symphysis component...
September 1, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28938130/learning-in-the-machine-the-symmetries-of-the-deep-learning-channel
#15
Pierre Baldi, Peter Sadowski, Zhiqin Lu
In a physical neural system, learning rules must be local both in space and time. In order for learning to occur, non-local information must be communicated to the deep synapses through a communication channel, the deep learning channel. We identify several possible architectures for this learning channel (Bidirectional, Conjoined, Twin, Distinct) and six symmetry challenges: (1) symmetry of architectures; (2) symmetry of weights; (3) symmetry of neurons; (4) symmetry of derivatives; (5) symmetry of processing; and (6) symmetry of learning rules...
November 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28932180/hardware-efficient-on-line-learning-through-pipelined-truncated-error-backpropagation-in-binary-state-networks
#16
Hesham Mostafa, Bruno Pedroni, Sadique Sheik, Gert Cauwenberghs
Artificial neural networks (ANNs) trained using backpropagation are powerful learning architectures that have achieved state-of-the-art performance in various benchmarks. Significant effort has been devoted to developing custom silicon devices to accelerate inference in ANNs. Accelerating the training phase, however, has attracted relatively little attention. In this paper, we describe a hardware-efficient on-line learning technique for feedforward multi-layer ANNs that is based on pipelined backpropagation...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28922879/intraparenchymal-cysts-following-deep-brain-stimulation-variable-presentations-and-clinical-courses
#17
Kalman Katlowitz, Michael H Pourfar, Zvi Israel, Alon Y Mogilner
BACKGROUND: The development of cysts at the electrode lead is a rare complication of deep brain stimulation (DBS), with only 3 cases reported in the literature. A better understanding of the variable clinical presentations and courses of these cysts may help increase awareness of this potentially life-threatening complication. OBJECTIVE: To review the clinical presentation of patients with intraparenchymal cysts following DBS implantations. METHODS: We report 3 patients who developed a cyst along the course of the DBS lead...
October 1, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/28917548/volar-capsular-release-after-distal-radius%C3%A2-fractures
#18
Robin N Kamal, David S Ruch
PURPOSE: Loss of full wrist range of motion is common after treatment of distal radius fractures. Loss of wrist extension limiting functional activities, although uncommon, can occur after volar plating of distal radius fractures. Unlike other joints in which capsular release is a common form of treatment for stiffness, this has been approached with caution in the wrist owing to concerns for carpal instability. We tested the null hypothesis that hardware removal and open volar capsular release would not lead to improved upper extremity-specific patient-reported outcome (Disabilities of the Arm, Shoulder, and Hand [DASH] questionnaire)...
September 14, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28904628/tibial-derotational-osteotomies-in-two-neuromuscular-populations-comparing-cerebral-palsy-with-myelomeningocele
#19
R M Thompson, S Ihnow, L Dias, V Swaroop
PURPOSE: To review the outcomes of tibial derotational osteotomies (TDOs) as a function of complication and revision surgery rates comparing a cohort of children with myelodysplasia to a cohort with cerebral palsy (CP). METHODS: A chart review was completed on TDOs performed in a tertiary referral centre on patients with myelodysplasia or CP between 1985 and 2013 in patients aged > 5 years with > 2 years follow-up. Charts were reviewed for demographics, direction/degree of derotation, complications and need for re-derotation...
August 1, 2017: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/28888524/total-knee-arthroplasty-after-opening-%C3%A2-versus-closing-wedge-high-tibial-osteotomy-a-135-case-series-with-minimum-5-year-follow-up
#20
M Ehlinger, A D'Ambrosio, P Vie, S Leclerc, F Bonnomet, P Bonnevialle, S Lustig, S Parratte, M Colmar, J-N Argenson
INTRODUCTION: High tibial osteotomy (HTO) is effective in treating isolated medial osteoarthritis of the knee, but subsequent deterioration is inevitable, and total knee arthroplasty (TKA) is then an option. The present study sought to compare TKA following medial opening-wedge HTO (OW-HTO) versus lateral closing-wedge HTO (CW-HTO) in terms of intraoperative data and clinical results. The study hypothesis was that there is no significant difference in clinical results or complications in TKA following OW-HTO or CW-HTO...
September 6, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
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