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https://www.readbyqxmd.com/read/28343372/east-of-the-andes-the-genetic-profile-of-the-peruvian-amazon-populations
#1
T Di Corcia, C Sanchez Mellado, T J Davila Francia, G Ferri, S Sarno, D Luiselli, O Rickards
OBJECTIVES: Assuming that the differences between the Andes and the Amazon rainforest at environmental and historical levels have influenced the distribution patterns of genes, languages, and cultures, the maternal and paternal genetic reconstruction of the Peruvian Amazon populations was used to test the relationships within and between these two extreme environments. MATERIALS AND METHODS: We analyzed four Peruvian Amazon communities (Ashaninka, Huambisa, Cashibo, and Shipibo) for both Y chromosome (17 STRs and 8 SNPs) and mtDNA data (control region sequences, two diagnostic sites of the coding region, and one INDEL), and we studied their variability against the rest of South America...
March 25, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28343339/bound-pahs-in-sediment-and-related-environmental-significance
#2
Jian-Yang Guo, Jing-An Chen, Jing-Fu Wang, Feng-Chang Wu
Extractable polycyclic aromatic hydrocarbons (EPAHs) and bound PAHs (BPAHs) were measured in a sediment core using conventional Soxhlet extraction and a more astringent extraction method, with the objectives of determining the influence of BPAHs on the historical reconstruction of PAHs and exploring the formation of BPAHs and long-term behaviors of PAHs in sediment. The results indicated that the formation of BPAHs was clearly sediment-depth and molecular-size dependent. BPAHs represents an important portion of PAHs in sediment and cannot be extracted by conventional Soxhlet extraction...
March 25, 2017: Archives of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28343325/mri-can-accurately-detect-meniscal-ramp-lesions-of-the-knee
#3
Justin W Arner, Elmar Herbst, Jeremy M Burnham, Ashish Soni, Jan-Hendrik Naendrup, Adam Popchak, Freddie H Fu, Volker Musahl
PURPOSE: Posterior horn meniscal tears are commonly found in conjunction with anterior cruciate ligament (ACL) injury. Some believe tears in the posterior meniscocapsular zone, coined ramp lesions, are important to knee stability. The purpose of this study was to determine whether pre-operative MRI evaluation was able to accurately and reproducibly identify ramp lesions. METHODS: Three blinded reviewers assessed MRIs twice for the presence of ramp lesions in patients undergoing ACL reconstruction...
March 25, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28343304/geometry-calibration-between-x-ray-source-and-detector-for-tomosynthesis-with-a-portable-x-ray-system
#4
Kohei Sato, Takashi Ohnishi, Masashi Sekine, Hideaki Haneishi
PURPOSE: Tomosynthesis is attracting attention as a low-dose tomography technology compared with X-ray CT. However, conventional tomosynthesis imaging devices are large and stationary. Furthermore, there is a limitation in the working range of the X-ray source during image acquisition. We have previously proposed the use of a portable X-ray device for tomosynthesis that can be used for ward rounds and emergency medicine. The weight of this device can be reduced by using a flat panel detector (FPD), and flexibility is realized by the free placement of the X-ray source and FPD...
March 25, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28343303/can-real-time-rgbd-enhance-intraoperative-cone-beam-ct
#5
Javad Fotouhi, Bernhard Fuerst, Wolfgang Wein, Nassir Navab
PURPOSE: Cone-Beam Computed Tomography (CBCT) is an important 3D imaging technology for orthopedic, trauma, radiotherapy guidance, angiography, and dental applications. The major limitation of CBCT is the poor image quality due to scattered radiation, truncation, and patient movement. In this work, we propose to incorporate information from a co-registered Red-Green-Blue-Depth (RGBD) sensor attached near the detector plane of the C-arm to improve the reconstruction quality, as well as correcting for undesired rigid patient movement...
March 25, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28343291/intercalary-frozen-autograft-for-reconstruction-of-malignant-bone-and-soft-tissue-tumours
#6
Karem M Zekry, Norio Yamamoto, Katsuhiro Hayashi, Akihiko Takeuchi, Takashi Higuchi, Kensaku Abe, Yuta Taniguchi, Ali Zein A A Alkhooly, Ahmed Saleh Abd-Elfattah, Ezzat H Fouly, Adel Refaat Ahmed, Hiroyuki Tsuchiya
PURPOSE: In 1999, we developed a technique using frozen autografts-tumour-containing bone treated with liquid nitrogen-for the reconstruction of malignant bone tumours. The purpose of this study was to evaluate the functional and oncological outcomes of frozen autografts for intercalary reconstruction of malignant bones and soft tissue tumours. METHODS: This retrospective study was designed to assess 34 patients of mean age 35 (range, 6-79) years. The mean follow-up period was 62 (24-214) months...
March 25, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28343096/sd-sem-sparse-dense-correspondence-for-3d-reconstruction-of-microscopic-samples
#7
Ahmadreza Baghaie, Ahmad P Tafti, Heather A Owen, Roshan M D'Souza, Zeyun Yu
Scanning electron microscopy (SEM) imaging has been a principal component of many studies in biomedical, mechanical, and materials sciences since its emergence. Despite the high resolution of captured images, they remain two-dimensional (2D). In this work, a novel framework using sparse-dense correspondence is introduced and investigated for 3D reconstruction of stereo SEM images. SEM micrographs from microscopic samples are captured by tilting the specimen stage by a known angle. The pair of SEM micrographs is then rectified using sparse scale invariant feature transform (SIFT) features/descriptors and a contrario RANSAC for matching outlier removal to ensure a gross horizontal displacement between corresponding points...
March 20, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28342923/giant-intracranial-aneurysms-surgical-treatment-and-risk-factors-analysis
#8
Long Xu, Xiaofeng Deng, Shuo Wang, Yong Cao, Yuanli Zhao, Dong Zhang, Yan Zhang, Rong Wang, Wei Qi, Jizong Zhao
OBJECTIVE: The surgical treatment of giant intracranial aneurysms (GIAs; diameter≥25mm) is challenging. The objective of this paper is to study the clinical outcome of GIAs treated with different surgical modalities and to analyze the factors affecting prognosis. METHODS: A consecutive series of 204 patients with GIAs who received surgical treatment in our department from 1995 to 2008 were analyzed retrospectively. The clinical outcome was evaluated with the Glasgow Outcome Scale (GOS)...
March 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28342884/oral-cancer-reconstruction-using-the-supraclavicular-artery-island-flap-comparison-to-free-radial-forearm-flap
#9
Christian Welz, Martin Canis, Sabina Schwenk-Zieger, Jennifer L Spiegel, Bernhard G Weiß, Yiannis Pilavakis
PURPOSE: To evaluate whether the pedicled supraclavicular artery island flap (SCAIF) is a sufficient alternative to the fasciocutaneous radial forearm free flap (RFFF) for oral reconstruction in cancer surgery. PATIENTS AND METHODS: The authors designed and implemented a retrospective cohort study composed of all consecutive patients who underwent head and neck reconstruction after cancer surgery at their tertiary university hospital from 2013 to 2016. Demographics and peri- and postoperative information were recorded and statistically analyzed...
March 2, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28342820/injury-of-the-obturator-nerve-in-the-modified-stoppa-approach-for-acetabular-fractures
#10
Ji Wan Kim, Hyun Chul Shon, Jai Hyung Park
INTRODUCTION: The modified Stoppa approach for acetabular fractures has become popular. However, the possibility of injury to the obturator nerve with this approach has not been sufficiently considered. We have experienced a case of nerve entrapment in severely displaced fractures. Therefore we performed a retrospective study to: 1) evaluate the incidence of obturator nerve injury in the modified Stoppa approach for acetabular fractures, 2) analyze the relationship between the extent of displacement of the quadrilateral plate and injury to the obturator nerve HYPOTHESIS: We hypothesized that obturator nerve injury would be related to a marked medial displacement of the quadrilateral plate PATIENTS AND METHODS: We conducted a retrospective cohort study of 22 patients with acetabular fractures that were surgically treated with the modified Stoppa approach...
March 22, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28342819/ankylosis-of-the-knee-after-septic-arthritis-following-anterior-cruciate-ligament-reconstruction-in-a-13-year-old-male
#11
Bastian Mester, Falk Ullerich, Tobias Ohmann, Martin Glombitza, Christian Schoepp
We present the case of an adolescent male developing anankylosis of the knee after septic arthritis following anterior cruciate ligamentreconstruction (ACLR).The patientwas shifted to our institutionwithpostoperative septic arthritis associated with a systemic septic condition. Before, repeated arthroscopic surgery had beenconductedwithoutany improvement. MRI showed a concomitant osteomyelitis. The infection (Gächter IV, S. aureus) was controlled by an open surgical approach and graft removal.An increasing joint stiffness wasdocumented...
March 22, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28342738/american-brachytherapy-society-consensus-statement-for-soft-tissue-sarcoma-brachytherapy
#12
A O Naghavi, D C Fernandez, N Mesko, A Juloori, A Martinez, J G Scott, C Shah, L B Harrison
PURPOSE: Radiation therapy represents an essential treatment option in the management of soft tissue sarcomas (STS). Brachytherapy represents an important subset of radiation therapy techniques used for STS, with evolving indications and applications. Therefore, the purpose of this guideline was to update clinicians regarding the data surrounding brachytherapy (BT) and provide recommendations for the utilization of BT in patients with STS. METHODS AND MATERIALS: Members of the American Brachytherapy Society with expertise in STS, and STS BT in particular, created an updated guideline for the use of BT in STS based on a literature review and clinical experience...
March 22, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28342722/the-effects-of-graft-size-and-insertion-site-location-during-anterior-cruciate-ligament-reconstruction-on-intercondylar-notch-impingement
#13
Alexander D Orsi, Paul K Canavan, Askhan Vaziri, Ruben Goebel, Onaly A Kapasi, Hamid Nayeb-Hashemi
BACKGROUND: Intercondylar notch impingement is detrimental to the anterior cruciate ligament (ACL). Notchplasty is a preventative remodeling procedure performed on the intercondylar notch during ACL reconstruction (ACLR). This study investigates how ACL graft geometry and both tibial and femoral insertion site location may affect ACL-intercondylar notch interactions post ACLR. A range of ACL graft sizes are reported during ACLR, from six millimeters to 11mm in diameter. Variability of three millimeters in ACL insertion site location is reported during ACLR...
March 22, 2017: Knee
https://www.readbyqxmd.com/read/28342647/recurrence-patterns-after-a-decreased-dose-of-40gy-to-the-elective-treated-neck-in-head-and-neck-cancer
#14
Daan Nevens, Fréderic Duprez, Jean-François Daisne, Julie Schatteman, Aline Van der Vorst, Wilfried De Neve, Sandra Nuyts
PURPOSE: To investigate the patterns of regional recurrences with emphasis on recurrences in the electively irradiated lymph node regions after dose de-escalation to 40Gy (EQD2Gy) in head and neck cancer. METHODS AND MATERIALS: Two hundred thirty-three patients treated with radio(chemo)therapy using 40Gy (EQD2Gy) to the elective lymph node regions were included. All regional recurrences were reconstructed and projected on the initial radiotherapy planning Computed Tomography studies to identify the localization of recurrence...
March 22, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28342638/-rationale-and-complications-of-the-anterior-lateral-extrapleural-retroperitoneal-approach-for-unstable-thoracolumbar-fractures-experience-in-86-consecutive-patients
#15
Pedro David Delgado-López, Antonio Rodríguez-Salazar, Vicente Martín-Velasco, Javier Martín-Alonso, José Manuel Castilla-Díez, Ana Galacho-Harriero, Elena Araús-Galdós
OBJECTIVES: To describe the rationale, pros and cons, and complications of the anterior-lateral extrapleural retroperitoneal approach for unstable (TLICS>4) thoracolumbar fractures. PATIENTS AND METHODS: Clinical and radiological data and outcomes from a cohort treated surgically via said approach were retrospectively reviewed. All patients were operated on exclusively by 5 neurosurgeons trained in spine surgery. RESULTS: Between June 1999 and December 2015, 86 patients underwent surgery (median age 42years, most common level: L1)...
March 22, 2017: Neurocirugía
https://www.readbyqxmd.com/read/28342545/distal-tibial-nonunion-using-a-contralateral-anterior-l-shaped-locking-compression-plate-through-a-posterior-lateral-approach-a-retrospective-case-series
#16
Chuanlu Lin, Lixiang Lin, Lutchooman Vinesh, Xiwen Shao, Xiaolang Lu, Jianjun Hong
BACKGROUND: Distal tibial nonunion is usually due to severe open distal tibial fractures with high energy injury. The best surgical treatment is not well established because of the poor soft tissue condition. We retrospectively analyzed a series of patients with distal tibial nonunion after severe open distal tibial fractures; our purpose was to introduce a treatment using a contralateral anterior L-shaped locking compression plate through a posterior-lateral approach with Iliac crest bone graft and evaluate the outcomes of patients...
March 19, 2017: Injury
https://www.readbyqxmd.com/read/28342360/ensemble-based-release-estimation-for-accidental-river-pollution-with-known-source-position
#17
Xiaole Zhang, Meng Huang
Dispersion model is an important tool for decision makers to accurately assess risks and effectively plan countermeasures during river pollution accidents, but their applications suffer from significant modeling uncertainties, primarily due to the scarce information of the source. A fully sequential inverse estimation method is proposed to reconstruct the temporal release for accidental river pollution. The method is based on a one-dimensional advection-dispersion model in conjunction with the augmented ensemble Kalman filter method...
March 15, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28340490/a-novel-method-of-neo-osseous-flap-prefabrication-induction-of-free-calvarial-periosteum-with-bioactive-glass
#18
Ali Aliyev, Omer Ekin, Ozan Bitik, Gokhan Tuncbilek
Background Reconstruction of craniofacial bone defects is a primary focus of craniofacial surgery. Although autogenous bone grafts remain as the gold standard, alloplastic materials have also gained widespread popularity due to their off-the-shelf availability, ease of use, and durability. In addition to replacing the missing bone, some of these alloplastic materials have also been found to induce new bone formation. Objectives In this study, the phenomenon of neo-osseous induction with bioactive glass was investigated for different implant-soft tissue configurations...
March 24, 2017: Journal of Reconstructive Microsurgery
https://www.readbyqxmd.com/read/28340394/assessment-of-engineered-surfaces-roughness-by-high-resolution-3d-sem-photogrammetry
#19
L C Gontard, J D López-Castro, L González-Rovira, J M Vázquez-Martínez, F M Varela-Feria, M Marcos, J J Calvino
We describe a methodology to obtain three-dimensional models of engineered surfaces using scanning electron microscopy and multi-view photogrammetry (3DSEM). For the reconstruction of the 3D models of the surfaces we used freeware available in the cloud. The method was applied to study the surface roughness of metallic samples patterned with parallel grooves by means of laser. The results are compared with measurements obtained using stylus profilometry (PR) and SEM stereo-photogrammetry (SP). The application of 3DSEM is more time demanding than PR or SP, but it provides a more accurate representation of the surfaces...
March 7, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28339918/can-clinically-relevant-dose-errors-in-patient-anatomy-be-detected-by-gamma-passing-rate-or-modulation-complexity-score-in-volumetric-modulated-arc-therapy-for-intracranial-tumors
#20
Shingo Ohira, Yoshihiro Ueda, Masaru Isono, Akira Masaoka, Misaki Hashimoto, Masayoshi Miyazaki, Masaaki Takashina, Masahiko Koizumi, Teruki Teshima
We investigated whether methods conventionally used to evaluate patient-specific QA in volumetric-modulated arc therapy (VMAT) for intracranial tumors detect clinically relevant dosimetric errors. VMAT plans with coplanar arcs were designed for 37 intracranial tumors. Dosimetric accuracy was validated by using a 3D array detector. Dose deviations between the measured and planned doses were evaluated by gamma analysis. In addition, modulation complexity score for VMAT (MCSv) for each plan was calculated. Three-dimensional dose distributions in patient anatomy were reconstructed using 3DVH software, and clinical deviations in dosimetric parameters between the 3DVH doses and planned doses were calculated...
March 3, 2017: Journal of Radiation Research
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