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Dali Yin, Gerald Oh, Sergey Neckrysh
Background: For C2 pedicle screw placement/instrumentation, it is critical to adequately measure the axial and oblique C2 pedicle diameters utilizing the intraoperative O-arm. Methods: Thirty-three patients who underwent C2 pedicle screw placement (2013-2016) utilizing the O-arm with tri-planar reconstruction. As O-arm software does not allow calibrated measurements with the application's measurement tool, we directly measured axial and oblique widths of the C2 pedicles on the screen with a regular ruler (e...
2018: Surgical Neurology International
Ron N Alkalay, Robert Adamson, Michael W Groff
BACKGROUND CONTEXT: In the lumbar spine, end plate preparation for the interbody fusion cages may critically affect the cage's long term performance. This study investigated the effect of the interbody cage design on the compliance and cage subsidence of instrumented spines under cyclic compression. PURPOSE: To quantify the role of cage geometry and bone density on the stability of the spinal construct in response to cyclic compressive loads. STUDY DESIGN: Changes in the cage-bone interface and the effect of bone density on these changes were evaluated in a human cadaveric model for three intervertebral cage designs...
March 8, 2018: Spine Journal: Official Journal of the North American Spine Society
Wenjuan Ma, Yumei Zhao, Yu Ji, Xinpeng Guo, Xiqi Jian, Peifang Liu, Shandong Wu
RATIONALE AND OBJECTIVES: This study aimed to investigate whether quantitative radiomic features extracted from digital mammogram images are associated with molecular subtypes of breast cancer. MATERIALS AND METHODS: In this institutional review board-approved retrospective study, we collected 331 Chinese women who were diagnosed with invasive breast cancer in 2015. This cohort included 29 triple-negative, 45 human epidermal growth factor receptor 2 (HER2)-enriched, 36 luminal A, and 221 luminal B lesions...
March 8, 2018: Academic Radiology
Ahmet Emrah Acan, Onur Hapa, Levent Horoz, Aylin Kara, Hasan Havıtçıoğlu
OBJECTIVES: This study aims to evaluate the effects of anchor positions on the suture holding strength of a double-row knotless fixation in rotator cuff repair. MATERIALS AND METHODS: Four different double-row fixation techniques were assessed. In group 1, a 15-mm-wide mattress suture was fixed using a knotless lateral row anchor, horizontal to the shaft. In group 2, the medial sutures were fixed with a 5-mm more lateral anchor that was placed at 45° to the long axis of the humeral shaft...
April 2018: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
Murat Oto, İlker Abdullah Sarıkaya, Ozan Ali Erdal, Ali Şeker
OBJECTIVES: This study aims to review the efficacy of femoral varus derotation osteotomy (VDRO) and Dega transiliac osteotomy in the treatment of hip subluxation and dislocation of cerebral palsy (CP) patients. PATIENTS AND METHODS: This retrospective study included 25 hips of 22 CP patients (9 males, 13 females; mean age 8.7 years; range 4 to 18 years) who were operated due to hip subluxation and dislocation between July 2010 and December 2015. The mean follow-up period was 36...
April 2018: Eklem Hastalıkları Ve Cerrahisi, Joint Diseases & related Surgery
Carmen Canovas, Aixa Alarcon, Robert Rosén, Sanjeev Kasthurirangan, Joseph J K Ma, Douglas D Koch, Patricia Piers
PURPOSE: To assess the accuracy of toric intraocular lens (IOL) power calculations of a new algorithm that incorporates the effect of posterior corneal astigmatism (PCA). SETTING: Abbott Medical Optics, Inc., Groningen, the Netherlands. DESIGN: Retrospective case report. METHODS: In eyes implanted with toric IOLs, the exact vergence formula of the Tecnis toric calculator was used to predict refractive astigmatism from preoperative biometry, surgeon-estimated surgically induced astigmatism (SIA), and implanted IOL power, with and without including the new PCA algorithm...
March 7, 2018: Journal of Cataract and Refractive Surgery
Emine Caliskan, Shamil Aliyev, Hatice Arioz Habibi, Zuhal Bayramoglu, Ravza Yilmaz, Ibrahim Adaletli
OBJECTIVE: To evaluate the utility of radiodensity ratio between lungs on chest X-ray for the diagnosis of radiolucent foreign body aspiration (FBA) in children. METHODS: X-rays of 33 patients with confirmed diagnosis of FBA by bronchoscopy were compared to 66 control patients. We divided the study group into three subgroups: symmetric (13-patients), right-oblique (RO;12-patients) and left-oblique (LO;8-patients). RESULTS: When we compared FBA-symmetric-subgroup to symmetric-control-group, FBA-RO-subgroup to RO-control-group and FBA-LO-subgroup to LO-control-group, radiodensity ratios were significantly higher in the FBA subgroups...
March 4, 2018: Clinical Imaging
Soichi Otsuki
The reduced effective Mueller matrices of forward scattering from birefringent turbid slab media were calculated using a Monte Carlo simulation and were factorized in two dimensions by the Lu-Chipman polar decomposition. For a slab medium with the birefringence axis parallel to the y axis, the polarization parameters have second- or fourth-order rotational symmetry. Especially, the absolute value of linear retardance |δ| shows a characteristic variation; it becomes maximal at the azimuths of 0° and 180° but minimal at 90° and 270°...
March 1, 2018: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Taylor J Jackson, Burt Yaszay, Joshua M Pahys, Anuj Singla, Firoz Miyanji, Suken A Shah, Paul D Sponseller, Peter O Newton, John M Flynn, Patrick J Cahill
BACKGROUND: For large scoliosis, 2 strategies to maximize correction include intraoperative traction and/or anterior release. It is unclear which patients will benefit the most form either approach. The purpose of our study is to compare the radiographic, perioperative clinical outcomes, and health-related quality of life (HRQoL) outcomes of 2 approaches when used in severe neuromuscular scoliosis in the setting of cerebral palsy (CP). METHODS: In total, 23 patients with minimum 2-year follow-up, major curves ≥100 degrees, and in whom treatment included posterior spinal fusion were evaluated...
March 8, 2018: Journal of Pediatric Orthopedics
Gustavo Assis de Paula, Guilherme Carvalho Silva, Ênio Lacerda Vilaça, Tulimar Machado Cornacchia, Cláudia Silami de Magalhães, Allyson Nogueira Moreira
PURPOSE: Biomechanical behavior of tooth-implant-supported prostheses (TISPs) with external and internal implants was compared. MATERIALS AND METHODS: Two 3-D models of TISP were designed by varying the implant: external (Model EH) and internal hexagons (Model IH). After loading, von Mises stresses were obtained in implants, abutments, and screws. Principal maximum (σmax) and minimum (σmin) stresses were analyzed in periodontal ligament (PL), alveolar bone, and periimplant bone...
March 7, 2018: Implant Dentistry
Nino Andricevic, Mirko Junge, Jonas Krampe
OBJECTIVE: Construction of Injury risk functions (IRF) for front row occupants in oblique frontal crashes and a comparison to IRF of non-oblique frontal crashes from the same dataset. METHOD: Crashes of modern vehicles from the GIDAS (German In-depth Accident Study) were used as the basis for the construction of a logistic injury risk model. Static deformation, measured via displaced voxels on the post-crash vehicles, was used to calculate the energy dissipated in the crash...
March 9, 2018: Traffic Injury Prevention
Magdalena Grzonkowska, Mateusz Badura, Mariusz Baumgart, Anna Wiczołek, Jakub Lisiecki, Maciej Biernacki, Michał Szpinda
BACKGROUND: The inferior lumbar triangle of Petit is bounded by the iliac crest, lateral border of the latissimus dorsi and the medial border of the external oblique. OBJECTIVES: In the present study, we aimed to quantitatively examine the base, sides, area, and interior angles of the inferior lumbar triangle in the human fetus so as to provide their growth dynamics. MATERIAL AND METHODS: Using anatomical dissection, digital image analysis (NIS-Elements AR 3...
February 2018: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
Mingsong Li, Linda A Hinnov, Chunju Huang, James G Ogg
In ancient hothouses lacking ice sheets, the origins of large, million-year (myr)-scale sea-level oscillations remain a mystery, challenging current models of sea-level change. To address this mystery, we develop a sedimentary noise model for sea-level changes that simultaneously estimates geologic time and sea level from astronomically forced marginal marine stratigraphy. The noise model involves two complementary approaches: dynamic noise after orbital tuning (DYNOT) and lag-1 autocorrelation coefficient (ρ1 )...
March 8, 2018: Nature Communications
S Ozturk, H Cakin, K Karabulut, R Pasahan, M Kaplan
Lumboperitoneal shunts are widely used for the treatment of patients diagnosed with pseudotumor cerebri (PTC). Obesity is a risk factor for PTC. In particular, catheter migration out of the abdominal cavity is more commonly observed in morbidly obese patients. The aim of this study was to discuss the underlying mechanisms of catheter migration and treatment modalities in morbidly obese patients with PTC. The present study included four morbidly obese patients. All cases had undergone the previous laparotomy for insertion of a distal catheter into the abdominal cavity...
March 2018: Nigerian Journal of Clinical Practice
Reza Khorramirouz, Jason L Go, Christopher Noble, Soumen Jana, Eva Maxson, Amir Lerman, Melissa D Young
OBJECTIVES: Subcutaneous implantations in small animal models are currently required for preclinical studies of acellular tissue to evaluate biocompatibility, including host recellularization and immunogenic reactivity. METHODS: Three rat subcutaneous implantation methods were evaluated in six Sprague Dawley rats. An acellular xenograft made from porcine pericardium was used as the tissue-scaffold. Three implantation methods were performed; 1) Suture method is where a tissue-scaffold was implanted by suturing its border to the external oblique muscle, 2) Control method is where a tissue-scaffold was implanted without any suturing or support, 3) Frame method is where a tissue-scaffold was attached to a circular frame composed of polycaprolactone (PCL) biomaterial and placed subcutaneously...
March 5, 2018: Acta Histochemica
Kazuto Tsukita, Haruhi Sakamaki-Tsukita
No abstract text is available yet for this article.
March 6, 2018: QJM: Monthly Journal of the Association of Physicians
Hakan Arinc
PURPOSE: To evaluate the effects of prosthetic material on the degree of stress to the cortical bone, trabecular bone, framework, and implants using finite element analysis (FEA). MATERIALS AND METHODS: A mandibular implant-supported fixed prosthesis was designed. Different prosthetic materials [cobalt-chromium-supported ceramic, zirconia-supported ceramic, and zirconia-reinforced polymethyl methacrylate (ZRPMMA)-supported resin] were used. FEA was used to evaluate stress under different loading conditions...
March 5, 2018: Implant Dentistry
George S Chrysant, Anita A Phancao, Douglas A Horstmanshof, Susie Jones, James W Long
Evaluation of left ventricular devices is becoming increasingly important as the implantation of these devices increases. Cardiac computed tomography angiography (CCTA) has many potential advantages compared with plain radiographs and echocardiography to troubleshoot these devices and potentially help guide therapy. Heart failure (HF) remains a deadly, progressive disease with substantive and increasing morbidity, mortality, cost, and prevalence. Use of left ventricular assist devices (LVAD) as treatment for refractory HF has been steadily rising during the last decade...
March 5, 2018: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
Stephen J Jenkins
The long-range periodic order of a crystalline surface is generally represented by means of a two-dimensional Bravais lattice, of which only five symmetrically distinct types are possible. Here, we explore the circumstances under which each type may or may not be found at the surfaces of face-centred cubic materials, and provide means by which the type of lattice may be determined with reference only to the Miller indices of the surface; the approach achieves formal rigour by focussing upon the number theory of integer variables rather than directly upon real geometry...
March 8, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Rui Zhu, Wen-Xin Niu, Zhi-Peng Wang, Xiao-Long Pei, Bin He, Zhi-Li Zeng, Li-Ming Cheng
The normal physiological loads from muscles experienced by the spine are largely unknown due to a lack of data. The aim of this study is to investigate the effects of varying muscle directions on the outcomes predicted from finite element models of human lumbar spine. A nonlinear finite element model of L3-L5 was employed. The force of the erector spinae muscle, the force of the rectus abdominis muscle, follower loads, and upper body weight were applied. The model was fixed in a neural standing position and the direction of the force of the erector spinae muscle and rectus abdominis muscle was varied in three directions...
2018: BioMed Research International
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