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https://www.readbyqxmd.com/read/29162607/computational-study-on-the-effect-of-malalignment-of-the-tibial-component-on-the-biomechanics-of-total-knee-arthroplasty-a-finite-element-analysis
#1
D-S Suh, K-T Kang, J Son, O-R Kwon, C Baek, Y-G Koh
OBJECTIVES: Malalignment of the tibial component could influence the long-term survival of a total knee arthroplasty (TKA). The object of this study was to investigate the biomechanical effect of varus and valgus malalignment on the tibial component under stance-phase gait cycle loading conditions. METHODS: Validated finite element models for varus and valgus malalignment by 3° and 5° were developed to evaluate the effect of malalignment on the tibial component in TKA...
November 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/29162265/the-impact-of-antegrade-intramedullary-nailing-start-site-using-the-sign-nail-in-proximal-femoral-fractures-a-prospective-cohort-study
#2
Mohamed Mustafa Diab, Hao-Hua Wu, Edmund Eliezer, Billy Haonga, Saam Morshed, David W Shearer
INTRODUCTION: In many low and middle-income countries (LMICs) SIGN nail is commonly used for antegrade femoral intramedullary (IM) nailing, using a start site either at the tip of the greater trochanter or piriformis fossa. While a correct start site is considered an essential technical step; few studies have evaluated the impact of using an erroneous start site. This is particularly relevant in settings with limited access to fluoroscopy to aid in creating a nail entry point. The purpose of this study was to evaluate the impact of antegrade SIGN IM nailing start site on radiographic alignment and health-related quality of life...
November 18, 2017: Injury
https://www.readbyqxmd.com/read/29162241/influence-of-screw-combination-and-nail-materials-in-the-stability-of-anterograde-reamed-intramedullary-nail-in-distal-femoral-fractures
#3
Sergio Gabarre, Jorge Albareda, Luis Gracia, Sergio Puértolas, Elena Ibarz, Antonio Herrera
Intramedullary nailing (IM) is a technique universally accepted to treat femoral diaphyseal fractures. The treatment of fractures located in the distal third remains a controversial issue though. A finite element model of the femur has been developed, analyzing distal fractures with several gap sizes combined with different interlocking combinations of distal screws with one oblique screw proximally to stabilize the intramedullary nail. The mechanical strength of the nail against bending and compression efforts was also studied...
November 2017: Injury
https://www.readbyqxmd.com/read/29160858/hyperplanar-morphological-clustering-of-a-hippocampus-by-using-volumetric-computerized-tomography-in-early-alzheimer-s-disease
#4
Sarawut Suksuphew, Paramate Horkeaw
Background: On diagnosing Alzheimer's disease (AD), most existing imaging-based schemes have relied on analyzing the hippocampus and its peripheral structures. Recent studies have confirmed that volumetric variations are one of the primary indicators in differentiating symptomatic AD from healthy aging. In this study, we focused on deriving discriminative shape-based parameters that could effectively identify early AD from volumetric computerized tomography (VCT) delineation, which was previously almost intangible...
November 21, 2017: Brain Sciences
https://www.readbyqxmd.com/read/29160804/residual-endodontic-filling-material-after-post-space-preparation-a-confocal-microscopic-study
#5
Yu-Yao Teoh, Laurence J Walsh
This laboratory study assessed removability of endodontic alkaline cements and resin sealers using coronal cross-sectional slices of roots with single canals. Materials were labelled with 0.1% (w/w) sodium fluorescein prior to mixing so that confocal microscopy could be used to quantify material remaining on the walls of post spaces, to assess cleanliness. Roots of extracted teeth were prepared using rotary NiTi instruments then obturated using lateral condensation with gutta percha and epoxy resin sealers (AH-Plus™ or Zirmix™), or were filled by injecting mineral trioxide aggregate (MTA) cement (GC Nex™ MTA or MTAmix™) or a hard-setting calcium hydroxide cement (Supercal™)...
November 21, 2017: Materials
https://www.readbyqxmd.com/read/29160396/effect-of-intermediate-flush-using-different-devices-to-prevent-chemical-smear-layer-formation
#6
Camilla Corrêa Silva, Vivian Maria Durange Ferreira, Gustavo De-Deus, Daniel Rodrigo Herrera, Maíra do Prado, Emmanuel João Nogueira Leal da Silva
This study compared the effect of intermediate flush with distilled water delivered by conventional irrigation, EndoVac microcannula or Self-Adjusting File (SAF) system in the prevention of chemical smear layer (CSL) formation. Thirty human premolars were used. Canals were prepared with Reciproc system and 5.25% NaOCl. After chemomechanical preparation, samples were divided in 3 groups (n=10) according to the intermediate irrigation protocol with distilled water using: conventional irrigation, EndoVac microcannula or SAF...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29160020/comparison-of-quantitative-regional-ventilation-weighted-fourier-decomposition-mri-with-dynamic-fluorinated-gas-washout-mri-and-lung-function-testing-in-copd-patients
#7
Till F Kaireit, Marcel Gutberlet, Andreas Voskrebenzev, Julia Freise, Tobias Welte, Jens M Hohlfeld, Frank Wacker, Jens Vogel-Claussen
BACKGROUND: Ventilation-weighted Fourier decomposition-MRI (FD-MRI) has matured as a reliable technique for quantitative measures of regional lung ventilation in recent years, but has yet not been validated in COPD patients. PURPOSE/HYPOTHESIS: To compare regional fractional lung ventilation obtained by ventilation-weighted FD-MRI with dynamic fluorinated gas washout MRI ((19) F-MRI) and lung function test parameters. STUDY TYPE: Prospective study...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29159672/patellar-tracking-should-be-taken-into-account-when-measuring-radiographic-parameters-for-recurrent-patellar-instability
#8
Si Heng Sharon Tan, Mazen M Ibrahim, Zhaojie Joel Lee, Yen Kit Michael Chee, James H Hui
PURPOSE: To date, many radiographic parameters on patellar instability have their measurements taken statically, and have not been studied in various degrees of flexion according to the patellar tracking. There are also limited data regarding the use of these parameters in predicting recurrent patellar dislocation. The current study aims to review the radiographic parameters of the patellofemoral joint in different degrees of knee flexion and to correlate them with the presence of recurrent instability...
November 20, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29159278/comparative-evaluation-of-two-porcine-ex-vivo-models-for-training-in-endoscopic-ultrasound-guided-drainage-of-pancreatic-fluid-collections
#9
Frederick Moryoussef, Sarah Leblanc, Alice Bertucat, Arthur Laquiere, Emmanuel Coron, Luigi Mangialavori, Jean-Christophe Duchmann, Yann Le Baleur, Frederic Prat
Introduction:  EUS-guided cystoenterostomy (EUCE), a technique used for the drainage of pancreatic pseudocysts and peri-enteric collections, requires specific skills for which dedicated models are needed. Based on a compact EASIE model (Erlangen Active Simulator for Interventional Endoscopy), we developed two ex vivo porcine models of retrogastric cysts and evaluated learning performance within the frame of a structured training program. Material and methods:  The first model was made of porcine colon (i...
October 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/29159277/development-of-a-porcine-model-for-assessment-of-mucosal-repair-following-endoscopic-resection-of-the-lower-gastrointestinal-tract
#10
Nicolas Etchepare, Jérémy Bregeon, Lucille Quénéhervé, Sami Haddara, Yann Touchefeu, Michel Neunlist, Emmanuel Coron
Background and aims:  Endoscopic mucosal resection (EMR) is widely performed for the treatment of colorectal polyps. However, the pathophysiological mechanisms of mucosal repair, including in situations at high risk of post-polypectomy bleeding, remain largely unknown. The objective of our study was to develop a porcine model of EMR in the lower gastrointestinal tract to monitor mucosal wound healing over time. Methods:  Under general anesthesia, five large wounds were created in the lower gastrointestinal tract at different times, i...
October 2017: Endoscopy International Open
https://www.readbyqxmd.com/read/29155726/visualization-and-live-imaging-of-oligodendrocyte-organelles-in-organotypic-brain-slices-using-adeno-associated-virus-and-confocal-microscopy
#11
Lauritz Hagen Kennedy, Johanne Egge Rinholm
Neurons rely on the electric insulation and trophic support of myelinating oligodendrocytes. Despite the importance of oligodendrocytes, the advanced tools currently used to study neurons, have only partly been taken on by oligodendrocyte researchers. Cell type-specific staining by viral transduction is a useful approach to study live organelle dynamics. This paper describes a protocol for visualizing oligodendrocyte mitochondria in organotypic brain slices by transduction with adeno-associated virus (AAV) carrying genes for mitochondrial targeted fluorescent proteins under the transcriptional control of the myelin basic protein promoter...
October 23, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29153552/cervical-margin-relocation-in-indirect-adhesive-restorations-a-literature-review
#12
REVIEW
Jelena Juloski, Serhat Köken, Marco Ferrari
PURPOSE: The aim of this review was to summarize the existing scientific literature investigating on cervical margin relocation technique (CMR) performed prior to the adhesive cementation of the indirect restorations. STUDY SELECTION: An electronic search with no date restriction was conducted in the MEDLINE database, accessed through PubMed. The following main keywords were used: "cervical margin relocation", "coronal margin relocation", "deep margin elevation" and "proximal box elevation"...
November 15, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29151457/anatomical-profile-of-the-mesial-root-of-the-burmese-mandibular-first-molar-with-vertucci-s-type-iv-canal-configuration
#13
Maung Maung Kyaw Moe, Jung-Hong Ha, Myoung-Uk Jin, Young-Kyung Kim, Sung Kyo Kim
This study evaluated the anatomical profile of the mesial root canals of the Burmese mandibular first molar with Vertucci's type IV canal configuration (VT4) using microcomputed tomography analysis. Seventy-five mesial roots of extracted mandibular first molars were scanned and evaluated. Fourteen middle mesial canals (MMCs) were observed in the specimens; each specimen had an average of 1.63 lateral canals and 3.77 apical foramina. The lateral canals arising from the mesiobuccal canal, mesiolingual canal, MMC, and isthmus terminated at an average distance of 0...
November 17, 2017: Journal of Oral Science
https://www.readbyqxmd.com/read/29150745/alignment-in-the-transverse-plane-but-not-sagittal-or-coronal-plane-affects-the-risk-of-recurrent-patella-dislocation
#14
Shigeru Takagi, Takashi Sato, Satoshi Watanabe, Osamu Tanifuji, Tomoharu Mochizuki, Go Omori, Naoto Endo
PURPOSE: Abnormalities of lower extremity alignment (LEA) in recurrent patella dislocation (RPD) have been studied mostly by two-dimensional (2D) procedures leaving three-dimensional (3D) factors unknown. This study aimed to three-dimensionally examine risk factors for RPD in lower extremity alignment under the weight-bearing conditions. METHODS: The alignment of 21 limbs in 15 RPD subjects was compared to the alignment of 24 limbs of 12 healthy young control subjects by an our previously reported 2D-3D image-matching technique...
November 17, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29147655/magnetic-resonance-colonography-may-predict-the-need-for-bowel-resection-in-colorectal-endometriosis
#15
Arnaldo Scardapane, Filomenamila Lorusso, Mariantonietta Francavilla, Stefano Bettocchi, Fabiana Divina Fascilla, Giuseppe Angelelli, Marco Scioscia
Purpose: To define if MRI findings in patients with deep pelvic endometriosis (DPE) may be predictive for the need of bowel resection. Material and Methods: A retrospective survey of 196 pelvic MRIs of women who received laparoscopic procedures for DPE was carried out. A pelvic MRI was performed in all patients: it consisted in T2w-TSE sequences in axial, sagittal, and coronal planes and T1w and THRIVE sequences in the axial plane; the exam was completed by MR-Colonography...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29146509/isolated-coronal-shear-fracture-of-the-nonossified-humeral-trochlea-in-a-7-year-old-patient
#16
Michiyo Tomaru, Denju Osada, Kazuya Tamai, Hiroshi Taneichi
Coronal shear fractures of the nonossified humeral trochlea are extremely rare in skeletally immature children. This fracture is difficult to diagnose accurately on routine radiographs. In addition, the mechanism of injury and appropriate treatment methods are unknown. We present the case of a 7-year-old boy who sustained an isolated coronal shear fracture of the nonossified humeral trochlea. Internal fixation of the fracture was performed with 2 K-wires. Two and a half years after surgery, the patient had pain-free active range of motion of the elbow from 0° to 130° with full forearm rotation and magnetic resonance imaging showed healing of the chondral fragment of the trochlea...
November 14, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29145964/does-the-position-of-the-scapula-in-relation-to-the-glenopolar-angle-change-the-preferred-treatment-of-extra-articular-fractures
#17
Pedro José Labronici, Augusto Khede Tavares, Erasmo Cavalheiro Canhoto, Vincenzo Giordano, Robinson Esteves Santos Pires, Luiz Henrique Penteado da Silva, Marcelo Bezerra Mathias, Isabela de Miranda Rosa
OBJECTIVE: To analyse the glenopolar angle (GPA) at different inclinations of the scapula using 3D CT, to test the hypothesis that the result could change the indication from conservative treatment to surgery. MATERIALS AND METHODS: Analysis of 30 3D CT images of patients' scapulae, measuring the GPA. The GPA was measured with scapulae at 0(°) and at 20(°) and 30(°) of internal and external rotation. Angles were compared by age, sex and examiner for the different angles of rotation of the scapulae...
October 2017: Injury
https://www.readbyqxmd.com/read/29145877/trajectory-of-instantaneous-axis-of-rotation-in-fixed-lumbar-spine-with-instrumentation
#18
Masataka Inoue, Tetsutaro Mizuno, Toshihiko Sakakibara, Takaya Kato, Takamasa Yoshikawa, Tadashi Inaba, Yuichi Kasai
BACKGROUND: Several studies showed instantaneous axis of rotation (IAR) in the intact spine. However, there has been no report on the trajectory of the IAR of a damaged spine or that of a fixed spine with instrumentation. It is the aim of this study to investigate the trajectory of the IAR of the lumbar spine using the vertebra of deer. METHODS: Functional spinal units (L5-6) from five deer were evaluated with six-axis material testing machine. As specimen models, we prepared a normal model, a damaged model, and a pedicle screw (PS) model...
November 16, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29145830/differences-in-vertebral-morphology-around-the-apical-vertebrae-between-neuromuscular-scoliosis-and-idiopathic-scoliosis-in-skeletally-immature-patients-a-three-dimensional-morphometric-analysis
#19
Takahiro Makino, Yusuke Sakai, Masafumi Kashii, Shota Takenaka, Kazuomi Sugamoto, Hideki Yoshikawa, Takashi Kaito
BACKGROUND: Recent morphological analyses of vertebrae in patients with scoliosis have revealed three-dimensional (3D) deformities in the vertebral bodies. However, it remains controversial whether these deformities are secondary changes caused by asymmetrical vertebral loading or primary changes caused by aberrant asymmetrical vertebral growth. Furthermore, the difference in vertebral morphology between scoliosis with different pathogeneses remains unclear. This study was aimed to investigate the difference in the coronal asymmetry of vertebral bodies between neuromuscular scoliosis (NS) in Duchenne muscular dystrophy (DMD) and idiopathic scoliosis (IS) using in vivo 3D analysis...
November 16, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29145286/bilateral-discoid-medial-meniscus-associated-with-meniscal-tears-and-hypoplasia-of-the-medial-femoral-condyle-a-case-report
#20
Hong-De Wang, Shi-Jun Gao
RATIONALE: Bilateral discoid medial menisci is an extremely rare abnormality of the knee joint. The presence of a discoid medial meniscus has been associated with magnetic resonance imaging (MRI) and radiographic changes in the tibial region, such as cupping of the medial tibial plateau and tibial physis collapse. While discoid medial meniscal tears with hypoplasia of the femoral medial condyles have not been previously reported. Herein, we report a case of bilateral discoid medial menisci associated with meniscal tears and femoral bone changes...
November 2017: Medicine (Baltimore)
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