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Anatomic variations

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https://www.readbyqxmd.com/read/28732221/atrophic-mandible-fractures-are-bone-grafts-necessary-an-update
#1
Jaime Castro-Núñez, Larry L Cunningham, Joseph E Van Sickels
PURPOSE: The management of atrophic mandibular fractures poses a challenge because of anatomic variations and medical comorbidities associated with elderly patients. The purpose of this article is to review and update the literature regarding the management of atrophic mandible fractures using load-bearing reconstruction plates placed without bone grafts. MATERIALS AND METHODS: We performed a review of the English-language literature looking for atrophic mandibular fractures with or without continuity defects and reconstruction without bone grafts...
June 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28729605/evaluating-the-effects-of-material-properties-of-artificial-meniscal-implant-in-the-human-knee-joint-using-finite-element-analysis
#2
Duraisamy Shriram, Gideon Praveen Kumar, Fangsen Cui, Yee Han Dave Lee, Karupppasamy Subburaj
Artificial meniscal implants may replace severely injured meniscus and restore the normal functionality of the knee joint. Implant material stiffness and shape influence the longevity of implantations. This study, using 3D finite element analysis, aimed to evaluate the effects of material stiffness variations of anatomically shaped artificial meniscal implant in the knee joint. Finite element simulations were conducted on five different cases including intact knee, medial meniscectomized knee, and the knee joint with the meniscal implant with three distinct material stiffness...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728780/detecting-regional-stiffness-changes-in-aortic-aneurysmal-geometries-using-pressure-normalized-strain
#3
Doran S Mix, Ling Yang, Camille C Johnson, Nathan Couper, Ben Zarras, Isaac Arabadjis, Lauren E Trakimas, Michael C Stoner, Steven W Day, Michael S Richards
Transabdominal ultrasound elasticity imaging could improve the assessment of rupture risk for abdominal aortic aneurysms by providing information on the mechanical properties and stress or strain states of vessel walls. We implemented a non-rigid image registration method to visualize the pressure-normalized strain within vascular tissues and adapted it to measure total strain over an entire cardiac cycle. We validated the algorithm's performance with both simulated ultrasound images with known principal strains and anatomically accurate heterogeneous polyvinyl alcohol cryogel vessel phantoms...
July 17, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28728467/a-potential-therapeutic-pitfall-in-the-treatment-of-venous-reflux-due-to-variant-planar-anatomy-of-varicose-segments
#4
Sinan Deniz, Derya Tureli, Burcu Akpinar, Levent Oguzkurt
Purpose To elaborate on a planar anatomic variant of great saphenous vein as a potential therapeutic pitfall in the treatment of venous reflux. Materials and methods Lower extremity veins in 568 limbs with great saphenous vein insufficiency were sonographically mapped. A rather overlooked variation, the saphenous bow, was studied with emphasis on anatomic clarification and its involvement in venous insufficiency. Results This variation, observed in 5.1% (n = 29) of limbs, comprised two segments; one uninterrupted great saphenous vein proper coursing throughout saphenous compartment and one extra-compartmental segment originating distally from and proximally fusing with it...
January 1, 2017: Phlebology
https://www.readbyqxmd.com/read/28726684/low-dose-4d-cone-beam-ct-via-joint-spatiotemporal-regularization-of-tensor-framelet-and-nonlocal-total-variation
#5
Hao Han, Hao Gao, Lei Xing
Excessive radiation exposure is still a major concern in 4D cone-beam computed tomography (4D-CBCT) due to its prolonged scanning duration. Radiation dose can be effectively reduced by either under-sampling the x-ray projections or reducing the x-ray flux. However, 4D-CBCT reconstruction under such low-dose protocols is prone to image artifacts and noise. In this work, we propose a novel joint regularization-based iterative reconstruction method for low-dose 4D-CBCT. To tackle the under-sampling problem, we employ spatiotemporal tensor framelet (STF) regularization to take advantage of the spatiotemporal coherence of the patient anatomy in 4D images...
July 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28726308/the-collateral-venous-system-in-late-pregnancy-a-systematic-review-of-the-literature
#6
REVIEW
Aimee Humphries, Peter Stone, S Ali Mirjalili
INTRODUCTION: Recent literature has reported an association between maternal supine sleep position and stillbirth during late pregnancy. In this position the gravid uterus almost completely obstructs the inferior vena cava. A small number of women experience supine hypotension, thought to be due in part to inadequate collateral venous circulation. The aim of this paper is to review the literature describing the anatomy of the collateral venous system and in particular the azygos system, the abdominal portion of which has not been well studied...
July 20, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28726261/origin-and-prevalence-of-the-accessory-phrenic-nerve-a-meta-analysis-and-clinical-appraisal
#7
REVIEW
Matthew J Graves, Brandon Michael Henry, Wan Chin Hsieh, Beatrice Sanna, Przemysław A Pękala, Joe Iwanaga, Marios Loukas, Krzysztof A Tomaszewski
INTRODUCTION: The Accessory Phrenic Nerve (APN) is a common anatomical variant with differing reports of prevalence in the literature. It can be injured during operative procedures to the neck and thorax or by regional anesthetic techniques in its vicinity. Our aim was to provide a comprehensive evidence-based assessment of the prevalence and origins of the APN. MATERIALS AND METHODS: The databases PubMed, China National Knowledge Infrastructure, ScienceDirect, EMBASE, BIOSIS, SciELO, and Web of Science were searched comprehensively, followed by assessment of eligibility and extraction of data concerning the APN...
July 20, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28726244/computed-tomographic-morphometry-of-tympanic-bulla-shape-and-position-in-brachycephalic-and-mesaticephalic-dog-breeds
#8
Ben Mielke, Richard Lam, Gert Ter Haar
Anatomic variations in skull morphology have been previously described for brachycephalic dogs; however there is little published information on interbreed variations in tympanic bulla morphology. This retrospective observational study aimed to (1) provide detailed descriptions of the computed tomographic (CT) morphology of tympanic bullae in a sample of dogs representing four brachycephalic breeds (Pugs, French Bulldogs, English Bulldog, and Cavalier King Charles Spaniels) versus two mesaticephalic breeds (Labrador retrievers and Jack Russell Terriers); and (2) test associations between tympanic bulla morphology and presence of middle ear effusion...
July 20, 2017: Veterinary Radiology & Ultrasound
https://www.readbyqxmd.com/read/28725918/a-comprehensive-review-of-motor-innervation-of-the-hand-variations-and-clinical-significance
#9
REVIEW
Sacha Wynter, Lakal Dissabandara
PURPOSE: The objective of the present review is to assemble the recognized anatomical variations, classifications, and clinical evidence with regard to innervation of the hand and discuss the clinical significance of these variations. METHODS: The material for this review was obtained by exploring PubMed and Google Scholar (search terms: hand innervation, variations of ulnar nerve, variations of median nerve, variations of radial nerve) as well as from standard anatomy texts...
July 19, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28724970/classification-of-skin-phenotypes-caused-by-diabetes-mellitus-using-complex-scattering-parameters-in-the-millimeter-wave-frequency-range
#10
Fabian Dornuf, Pedro Martín-Mateos, Blanca Duarte, Bernhard Hils, Oscar Elias Bonilla-Manrique, Fernando Larcher, Pablo Acedo, Viktor Krozer
The pathological skin phenotype caused by hyperglycemia is an important indicator for the progress of diabetes mellitus. An early detection of diabetes assures an early intervention to regulate the carbohydrate metabolism. In this publication a non-invasive detection principle based on the measurement of complex scattering parameters in the millimeter-wave frequency range is presented. The measurement principle provides evidence of the applicability for the identification of different glycemic states in animal models...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28723942/comparative-analysis-of-vaginal-microbiota-sampling-using-16s-rrna-gene-analysis
#11
Seppo Virtanen, Ilkka Kalliala, Pekka Nieminen, Anne Salonen
BACKGROUND: Molecular methods such as next-generation sequencing are actively being employed to characterize the vaginal microbiota in health and disease. Previous studies have focused on characterizing the biological variation in the microbiota, and less is known about how factors related to sampling contribute to the results. Our aim was to investigate the impact of a sampling device and anatomical sampling site on the quantitative and qualitative outcomes relevant for vaginal microbiota research...
2017: PloS One
https://www.readbyqxmd.com/read/28722697/bifid-mandibular-canals-incidence-and-anatomical-variations-in-the-population-of-shanghai-area-by-cone-beam-computed-tomography
#12
Xiaoli Yang, Chengqi Lyu, Derong Zou
OBJECTIVE: The aim of this study was to analyze the rate, location, and characteristics of bifid mandibular canals (BMCs) in the population of the Shanghai area using cone beam computed tomography to avoid complications during surgical procedures. METHODS: Two hundred eighty patients were recruited for this study, and the presence and morphology of BMCs were evaluated. RESULTS: The occurrence rate of BMCs in the Shanghai area was relatively high compared with that in other populations, reaching 31...
July 2017: Journal of Computer Assisted Tomography
https://www.readbyqxmd.com/read/28722002/report-of-occurrence-and-endodontic-management-of-three-rooted-maxillary-first-and-second-premolars-in-the-same-individual
#13
Kothandaraman Sathyanarayanan, Manali Ramakrishnan Srinivasan, Sundaresan Balagopal, Lingeswaran Poornima
Anatomical variations should be kept in mind in clinical and carefully looked for in radiographic evaluation during endodontic treatment of maxillary premolars. These teeth have highly variable root canal morphology. Although three separate roots in the maxillary first premolars have been reported, it is a rarity to find both the first and second premolars possessing three separate roots. This case report describes the diagnosis and endodontic management of maxillary first and second premolars with three canals and three separate roots...
May 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28721082/effectiveness-evaluation-of-two-volumizing-hyaluronic-acid-dermal-fillers-in-a-controlled-randomized-double-blind-split-face-clinical-study
#14
Martina Kerscher, Karla Agsten, Maria Kravtsov, Welf Prager
BACKGROUND: Enhancement of the midface can be achieved with volumizing hyaluronic acid (HA) fillers. OBJECTIVE: The objective of this study was to compare the safety and effectiveness of Cohesive Polydensified Matrix(®) 26 mg/mL HA gel (CPM-26) and Vycross(®) 20 mg/ml HA gel (VYC-20) in a controlled, randomized, evaluator-blind, split-face clinical study. PATIENTS AND METHODS: Subjects with moderate-to-severe malar volume loss on the Merz Aesthetics Scale (MAS) received CPM-26 on one side and VYC-20 on the contralateral side of the face...
2017: Clinical, Cosmetic and Investigational Dermatology
https://www.readbyqxmd.com/read/28720406/mri-anatomical-preoperative-evaluation-of-distally-based-peroneus-brevis-muscle-flap-in-reconstructive-surgery-of-the-lower-limb
#15
Federico Barbera, Fulvio Lorenzetti, Ricccardo Marsili, Matteo Ragoni, Andrea Lisa, Virna Zampa, Marcello Pantaloni
BACKGROUND: The distally based peroneus brevis muscle flap has proved to be a simple solution for small- to moderate-sized wounds of the lower limb. The length of the muscle belly suitable for coverage is a crucial parameter. In this study, we evaluated the capability of 3D MRI of the lower limb to measure it preoperatively. METHODS: Between 2008 and 2017, 32 patients with lower limb defects underwent preoperative MRI to measure the peroneus brevis muscle length...
June 27, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28717288/cone-beam-computed-tomographic-analysis-of-the-course-and-position-of-mandibular-canal
#16
Hooman Khorshidi, Saeed Raoofi, Janan Ghapanchi, Shoaleh Shahidi, Maryam Paknahad
PURPOSE: Estimation of the relative position of infra alveolar nerve (IAN) canal and its relation to the mandibular anatomical landmarks can be clinically useful in minimizing the risk of surgery complications such as neurosensory disturbances that may occur after invasive mandibular surgical procedures. The purpose of the present study was to investigate the anatomic location and radiographic course of the mandibular canal compared to anatomic landmarks on CBCT and to discuss its clinical significance and also to determine the possible correlations between the mandibular position and the age of the patients...
September 2017: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/28716213/imaging-of-endoscopic-approaches-to-the-anterior-and-central-skull-base
#17
REVIEW
I M Schmalfuss
Sinonasal endoscopy for treatment of benign sinonasal diseases is a well-established procedure. Recent advances in endoscope technology have substantially expanded its application with many institutions now offering resection of skull base lesions and sinonasal malignancies via the endoscopic approach. Its minimally invasive nature leads to faster recovery time, better cosmetic results, and fewer complications. Unfortunately, not all lesions involving the sinonasal region and skull base are accessible to sinonasal endoscopy...
July 14, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/28715298/assessment-of-in%C3%A2-vivo-3d-kinematics-of-cervical-spine-manipulation-influence-of-practitioner-experience-and-occurrence-of-cavitation-noise
#18
Bernard Van Geyt, Pierre-Michel Dugailly, Paul Klein, Yves Lepers, Benoît Beyer, Véronique Feipel
BACKGROUND: Investigations on 3D kinematics during spinal manipulation are widely reported for assessing motion data, task reliability and clinical effects. However the link between cavitation occurrence and specific kinematics remains questionable. OBJECTIVES: This paper investigates the 3D head-trunk kinematics during high velocity low amplitude (HVLA) manipulation for different practitioners with respect to the occurrence of cavitation. METHODS: Head-trunk 3D motions were sampled during HVLA manipulation in twenty asymptomatic volunteers manipulated by four practitioners with different seniority (years of experience)...
April 2017: Musculoskeletal Science & Practice
https://www.readbyqxmd.com/read/28713632/radiographic-assessment-of-the-presigmoid-retrolabyrinthine-approach
#19
Andrew K Wong, Melissa M Stamates, Anita P Bhansali, Michael Shinners, Ricky H Wong
BACKGROUND: Lesions of the petroclival fissure are difficult to access surgically. Both retrosigmoid and presigmoid retrolabyrinthine approaches have been described to successfully treat these complex tumors. The retrosigmoid approach offers quick and familiar access, whereas the presigmoid retrolabyrinthine approach reduces the operative distance and the need for cerebellar retraction. The presigmoid retrolabyrinthine approach, however, is constrained by anatomical limits that can be subject to patient variation...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28713114/retrospective-assessment-of-healing-outcome-of-endodontic-treatment-for-mandibular-molars-with-c-shaped-root-canal
#20
Anika Bansal, Anuj Singh Parihar, Achla Sethi, Kishore Kumar Majety, Jaina Panjabi, Basanta Kumar Choudhury
INTRODUCTION: A thorough knowledge of the anatomic morphology of the root canal system is necessary for the long-term success of the root canal therapy. The occurrence of C-shaped root canal configuration is one such variation. Achievement of favorable prognosis after commencing root canal therapy in such teeth is one of the challenges imposed on the endodontist. Hence, we evaluated the healing occurring after endodontic therapy in patients with C-shaped root canals in mandibular molars...
July 1, 2017: Journal of Contemporary Dental Practice
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