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https://www.readbyqxmd.com/read/29236029/fracture-assessment-of-peek-under-static-loading-by-means-of-the-local-strain-energy-density
#1
Mirco Peron, Seyed Mohammad Javad Razavi, Jan Torgersen, Filippo Berto
Polyetheretherketone (PEEK) has gained interest in many industrial applications due to its high strength-to-weight ratio, excellent heat tolerance and high corrosion resistance. Stress concentrators such as notches and geometrical discontinuities are present in many such components necessitating the reliable assessment of notch sensitivity of PEEK in monotonic tension. Here we evaluate the applicability of the strain energy density (SED) approach for the assessment of the fracture strength of experimentally tested notched geometries subject to corrosion...
December 13, 2017: Materials
https://www.readbyqxmd.com/read/29232748/-combined-posteromedial-and-anterolateral-approach-in-the-floating-position-two-column-fracture-of-the-tibia-head
#2
Maike Reul, Harm Hoekstra
Background The posterior tibial plateau is often affected in intra-articular tibial fractures. Moreover, treating these posterior fractures is recognised as an important prognostic factor. Open reduction and internal fixation of lateral and posterior two column tibial plateau fractures can be achieved via a combined reversed L-shape approach and an anterolateral approach in the floating position without intraoperative repositioning of the patient. Material and Methods The operative procedure starts in the posterior position with visualisation of the posterior column after lateral retraction of the medial head of the M...
December 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29232194/persistent-ventricular-bigeminy-during-anesthesia-in-pediatric-patients-a-case-report-of-an-11-year-old-child
#3
Sheetal Dalal, Vikas Chaudhari
An 11-year-old male child with fractures in both bones in his left forearm presented for open reduction and internal fixation. The pre-anesthetic check-up and investigations did not reveal any pre-existing underlying cardio-respiratory disease. The patient had an uneventful peri-operative period during the operation and was comfortable without any anxiety or restlessness. After an uneventful induction and intubation as per routine protocol, the patient received 600 mg of amoxicillin+clavunate intravenously as an antibiotic...
December 12, 2017: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/29229815/de-novo-reconstitution-reveals-the-proteins-required-for-skeletal-muscle-voltage-induced-ca2-release
#4
Stefano Perni, Manuela Lavorato, Kurt G Beam
Skeletal muscle contraction is triggered by Ca2+ release from the sarcoplasmic reticulum (SR) in response to plasma membrane (PM) excitation. In vertebrates, this depends on activation of the RyR1 Ca2+ pore in the SR, under control of conformational changes of CaV1.1, located ∼12 nm away in the PM. Over the last ∼30 y, gene knockouts have revealed that CaV1.1/RyR1 coupling requires additional proteins, but leave open the possibility that currently untested proteins are also necessary. Here, we demonstrate the reconstitution of conformational coupling in tsA201 cells by expression of CaV1...
December 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29229417/diagnostic-value-of-computed-tomography-and-risk-factors-for-lateral-hinge-fracture-in-the-open-wedge-high-tibial-osteotomy
#5
O-Sung Lee, Yong Seuk Lee
PURPOSE: The purposes of this study were to evaluate (1) the disparity of detection of lateral hinge fracture (LHF) between postoperative simple radiography and high-resolution computed tomography (CT) and affecting factors of LHF and (2) whether generally recommended postoperative rehabilitation protocols are appropriate according to the type of LHF. METHODS: From 2014 to 2015, patients who underwent primary open wedge high tibial osteotomy (OWHTO) for isolated medial compartment osteoarthritis of the knee joint were retrospectively enrolled...
December 8, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29229219/computer-assisted-navigation-for-intramedullary-nail-fixation-of-intertrochanteric-femur-fractures-a-randomized-controlled-trial
#6
Ryan J Lilly, Denise M Koueiter, Kelly C Graner, Gregory P Nowinski, Jason Sadowski, Kevin D Grant
INTRODUCTION: Lag screw cutout is one of the most commonly reported complications following intramedullary nail fixation of intertrochanteric femur fractures. However, its occurrence can be minimized by a well-positioned implant, with a short Tip-to-Apex Distance (TAD). Computer-assisted navigation systems provide surgeons with the ability to track screw placement in real-time. This could allow for improved lag screw placement and potentially reduce radiation exposure to the patient and surgeon...
December 7, 2017: Injury
https://www.readbyqxmd.com/read/29228945/trends-in-incidence-of-proximal-humerus-fractures-surgical-procedures-and-outcomes-among-elderly-hospitalized-patients-with-and-without-type-2-diabetes-in-spain-2001-2013
#7
Maria Angeles Martinez-Huedo, Rodrigo Jiménez-García, Eduardo Mora-Zamorano, Valentín Hernández-Barrera, Manuel Villanueva-Martinez, Ana Lopez-de-Andres
BACKGROUND: Several studies have reported that diabetic persons have an increased risk for fractures than non-diabetes patients. The association between proximal humerus fractures and type 2 diabetes (T2DM) is unclear and some studies point to insulin treatment, hypoglycaemic episodes consequently to inadequate control of diabetes or, more recently, to an alteration of trabecular bone. We examined trends in the incidence of proximal humerus fractures, surgical procedures and outcomes among hospitalized patients aged ≥65 years, with and without T2DM in Spain, 2001-2013...
December 11, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29226718/contribution-to-fe-modeling-for-intraoperative-pedicle-screw-strength-prediction
#8
Maxim Van den Abbeele, Jean-Marc Valiadis, Lucas V P C Lima, Pascal Khalifé, Philippe Rouch, Wafa Skalli
Although the use of pedicle screws is considered safe, mechanical issues still often occur. Commonly reported issues are screw loosening, screw bending and screw fracture. The aim of this study was to develop a Finite Element (FE) model for the study of pedicle screw biomechanics and for the prediction of the intraoperative pullout strength. The model includes both a parameterized screw model and a patient-specific vertebra model. Pullout experiments were performed on 30 human cadaveric vertebrae from ten donors...
December 10, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/29226207/open-anterior-hip-dislocation-in-a-child-a-rare-mechanism-of-injury
#9
Ali A Esmailiejah, Mohammadreza Abbasian, Farshad Safdari, Sufian S Ahmad
Traumatic anterior dislocation of the hip is an extremely rare condition in children and open dislocation is even rarer. This isusually caused by high-energy trauma. In the current study, we present a case of an eight-year-old child suffering from an open anterior-inferior dislocation of the right hip concomitant with pelvic ring disruption and an ipsilateral open distal femoral fracture (Salter-Harris type 4, Gustilo type IIIA) caused by a traffic accident. The patient underwent successful emergent open reduction due to the buttonholed femoral head after appropriate irrigation and debridement...
September 2017: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/29226201/acute-primary-total-knee-arthroplasty-for-proximal-tibial-fractures-in-elderly
#10
Mohammad M Sarzaeem, Mohammad M Omidian, Gholamhossein Kazemian, Alireza Manafi
Background: Proximal tibial fractures in elderly patients with osteoporosis or knee osteoarthritis (OA) are challenging cases. In the current study, we present our experience with uncommon acute primary total knee arthroplasty (PTKA) in this patient population. Methods: PTKAs were performed following proximal tibial fractures in 30 consecutive patients over 60 years of age with osteoporosis or knee OA between 2005 and 2009. Three constrained condylar knees (CCK) and no hinged knee prosthesis were used...
September 2017: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/29226199/effectiveness-of-minimally-invasive-plate-osteosynthesis-mipo-on-comminuted-tibial-or-femoral-fractures
#11
Ali Andalib, Erfan Sheikhbahaei, Zeynab Andalib, Mohammad A Tahririan
Background: Comminuted fractures happen frequently due to traumas. Fixation without opening the fracture site, known as minimally invasive plate osteosynthesis (MIPO), has recently become prevalent. This study has been designed to assess the outcomes of this treatment for tibial and femoral comminuted fractures. Methods: A total of 60 patients with comminuted femoral or tibial fractures were operated with MIPO method in this cross-sectional study at Alzahra university hospital in 2015...
September 2017: Archives of Bone and Joint Surgery
https://www.readbyqxmd.com/read/29226123/open-repair-of-a-12-cm-posttraumatic-aneurysm-of-right-subclavian-artery
#12
Konstantinos Tigkiropoulos, Omiros Chalvatzoulis, Eleftherios Chalvatzoulis, Kyriakos Stavridis, Dimitrios Karamanos, Ioannis Lazaridis, Andreas Efstathiou, Nikolaos Saratzis
Purpose: To present a rare case of a patient with a 12-cm posttraumatic right subclavian artery aneurysm successfully treated with aneurysmectomy and innominate-axillary bypass. Case report: A 54-year-old man presented to the emergency department due to progressive dyspnea and hoarseness of voice. His medical record was unremarkable except that he had right-sided pneumothorax and multiple rib fractures from a car accident 16 years ago. A chest X-ray showed a mass in the upper lobe of the right lung, and the patient was hospitalized for further investigation...
2017: Frontiers in Surgery
https://www.readbyqxmd.com/read/29223659/complications-in-the-treatment-of-mandibular-condylar-fractures-surgical-versus-conservative-treatment
#13
REVIEW
Iván García-Guerrero, Juan M Ramírez, Rafael Gómez de Diego, José M Martínez-González, María S Poblador, José L Lancho
OBJECTIVES: In the present article, we aim to review the main intra- and post-operative complications associated with two different therapeutic approaches for treating mandibular condylar fractures: conservative (CTR) and surgical treatment (ORIF, Open Reduction and Internal Fixation). MATERIAL AND METHODS: We have carried out a retrospective, meta-analytic, observational study using literature review, covering the period between 2000- September 2017. The data obtained were processed using statistical software SPSS v...
December 6, 2017: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/29222664/anatomical-reconstruction-to-treat-acromion-fractures-following-reverse-shoulder-arthroplasty
#14
Florian Hess, Ralph Zettl, Daniel Smolen, Christoph Knoth
PURPOSE: Scapular fractures after reverse shoulder arthroplasty (RSA) are often associated with substantial shoulder impairment. Patient outcomes following either conservative or operative treatment have not been favourable, and consensus is lacking on the best treatment approach. We describe a technique for anatomic reconstruction of fractured lateral and basal acromion in patients at higher risk for diminished function or those for which conservative treatment has already failed. METHODS: Of the 95 patients who underwent RSA at our institution between December 2013 and December 2016, three had post-operative acromion fractures (type II)...
December 8, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/29222607/static-and-fatigue-strength-of-a-novel-anatomically-contoured-implant-compared-to-five-current-open-wedge-high-tibial-osteotomy-plates
#15
Arnaud Diffo Kaze, Stefan Maas, James Belsey, Alexander Hoffmann, Dietrich Pape
BACKGROUND: The purpose of the present study was to compare the mechanical static and fatigue strength of the size 2 osteotomy plate "Activmotion" with the following five other common implants for the treatment of medial knee joint osteoarthritis: the TomoFix small stature, the TomoFix standard, the Contour Lock, the iBalance and the second generation PEEKPower. METHODS: Six fourth-generation tibial bone composites underwent a medial open-wedge high tibial osteotomy (HTO), according to standard techniques, using size 2 Activmotion osteotomy plates...
December 8, 2017: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/29216705/-functional-results-of-open-wedge-osteotomies-in-lower-limb-angular-deformities-in-teenagers
#16
C Orellana-Reta, L A Valdez-Jiménez
OBJECTIVE: The aim of this study was to evaluate the functional and radiographic results of adolescent patients with angular deformities of the pelvic limbs treated with an open wedge osteotomy system. MATERIAL AND METHODS: Observational, prospective, analytical and cross-sectional study of patients with angular deformity of the pelvic limbs treated with an open wedge osteotomy. We made a radiographic evaluation of the femorotibial angle, MAD angle, lower limb discrepancy, and pre- and postoperative degrees of the rotational center of deformity (CORA), as well as a telephone survey of the postoperative functional evaluation IKDC 2000...
May 2017: Acta Ortopédica Mexicana
https://www.readbyqxmd.com/read/29214091/keeping-an-open-mind-cognitive-bias-in-the-evaluation-of-an-infant-with-posterior-lateral-rib-fractures
#17
Katie Johnson, Donald Chris Derauf, Raymond Stetson, Paul Galardy, Jason Homme
A four-month-old former premature male is incidentally found to have posterior-lateral rib fractures during evaluation of a febrile illness. This finding led to the initiation of a workup for nonaccidental trauma. A thorough history and physical exam ultimately led to the diagnosis, which was not related to abuse. This case highlights a rare sequela of patent ductus arteriosus repair, cautions medical teams to remain aware of how cognitive bias can affect diagnostic decision-making, and emphasizes the importance of a thorough history, physical exam, and medical record review in cases of suspected nonaccidental trauma...
2017: Case Reports in Pediatrics
https://www.readbyqxmd.com/read/29213070/sensitivity-analysis-of-coupled-processes-and-parameters-on-the-performance-of-enhanced-geothermal-systems
#18
S N Pandey, Vikram Vishal
3-D modeling of coupled thermo-hydro-mechanical (THM) processes in enhanced geothermal systems using the control volume finite element code was done. In a first, a comparative analysis on the effects of coupled processes, operational parameters and reservoir parameters on heat extraction was conducted. We found that significant temperature drop and fluid overpressure occurred inside the reservoirs/fracture that affected the transport behavior of the fracture. The spatio-temporal variations of fracture aperture greatly impacted the thermal drawdown and consequently the net energy output...
December 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29211861/spontaneous-microguidewire-extrusion-from-the-foot-following-cerebral-aneurysm-treatment-first-case-report
#19
Kurdow Nader, Saleh Lamin, Joseph Leyon, Swarupsinh Chavda, Allan Thomas, Sarin Kuruvath
BACKGROUND AND IMPORTANCE: Microguidewire entrapment and failure related to endovascular therapy is a rare complication with limited case reports available, most of which are from cardiac endovascular intervention. Migration of the microguidewire has been reported in coronary intervention with some resulting in severe complications, but there are no reported cases of spontaneous extrusion of wire fragment following a neurointerventional procedure. We report the first case of a microguidewire entrapment with subsequent fracture, followed by spontaneous extrusion of the wire fragment...
November 29, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29211625/anterior-inferior-iliac-spine-deformity-as-a-cause-for-extra-articular-hip-impingement-in-young-athletes-after-an-avulsion-fracture-a-case-report
#20
Eduardo N Novais, Mark F Riederer, Aaron J Provance
Extra-articular hip impingement from prior traumatic injury to the anterior inferior iliac spine (AIIS) is an uncommon cause of groin pain in young athletes. Currently, the most common treatment for this injury is arthroscopic decompression. However, hip arthroscopy is not universally available and requires advanced skills. We report 2 cases of the development of extra-articular hip impingement from unusual bony exostoses off the AIIS after traumatic injury in 2 young athletes who underwent open surgical resection...
December 1, 2017: Sports Health
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