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https://www.readbyqxmd.com/read/28651178/the-influence-of-impact-direction-and-axial-loading-on-the-bone-fracture-pattern
#1
Haim Cohen, Chen Kugel, Hila May, Bahaa Medlej, Dan Stein, Viviane Slon, Tamar Brosh, Israel Hershkovitz
The effect of the direction of the impact and the presence of axial loading on fracture patterns have not yet been established in experimental 3-point bending studies. PURPOSE: To reveal the association between the direction of the force and the fracture pattern, with and without axial loading. MATERIAL AND METHODS: A Dynatup Model POE 2000 (Instron Co.) low energy pendulum impact machine was utilized to apply impact loading on fresh pig femoral bones (n=50). The bone clamp shaft was adjusted to position the bone for three-point bending with and without additional bone compression...
May 22, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28645675/anatomical-considerations-of-the-iliac-crest-on-percutaneous-endoscopic-discectomy-using-a-transforaminal-approach
#2
Fumitake Tezuka, Toshinori Sakai, Mitsunobu Abe, Kazuta Yamashita, Yoichiro Takata, Kosaku Higashino, Akihiro Nagamachi, Takashi Chikawa, Koichi Sairyo
BACKGROUND CONTEXT: Percutaneous endoscopic discectomy (PED) is a minimally invasive procedure for the surgical treatment of lumbar disc herniation (LDH). It can be performed under local anesthesia and requires a skin incision of only 8 mm, with minimal disruption of the spinal structures including ligaments and muscles. However, performing PED with a transforaminal approach (TF-PED) for the lower lumbar spine is associated with some anatomical problems such as interference from the iliac crest...
June 20, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28645667/effect-of-different-restorative-crown-and-customized-abutment-materials-on-stress-distribution-in-single-implants-and-peripheral-bone-a-three-dimensional-finite-element-analysis-study
#3
Necati Kaleli, Duygu Sarac, Safak Külünk, Özgür Öztürk
STATEMENT OF PROBLEM: In recent years, the use of resin-matrix ceramics and polyetheretherketone (PEEK) abutments has been suggested to absorb excessive stresses on dental implants. However, only a few studies have evaluated the effect of these materials on stress distribution in implants and peripheral bone structure. PURPOSE: The purpose of this finite element analysis was to evaluate the biomechanical behaviors of resin-matrix ceramics and PEEK customized abutments in terms of stress distribution in implants and peripheral bone...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28645665/experimental-evaluation-of-stress-distribution-with-narrow-diameter-implants-a-finite-element-analysis
#4
Sezgi Cinel, Ersan Celik, Elcin Sagirkaya, Onur Sahin
STATEMENT OF PROBLEM: Narrow diameter implants were developed to allow placement in narrow alveolar ridges. Clinicians may have concerns about the durability and function of such implants. PURPOSE: The purpose of this finite element study was to compare the stress values occurring on the implant and at the implant bone interface after the application of the static and dynamic forces on narrow diameter, titanium and titanium-zirconia implants in the maxillary and mandibular second premolar region...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28644203/invasive-investigation-of-insular-cortex-epilepsy
#5
Philippe Ryvlin, Fabienne Picard
Invasive long-term EEG investigations of the insula have been performed since the mid-nineties in an expanding range of focal epilepsies suspected to involve the insular cortex. The various clinical forms of insular epilepsies were delineated during the last 2 decades, and include the following presentations: perisylvian epilepsy, temporal plus epilepsy, sleep hypermotor epilepsy, MRI-negative frontal and parietal lobe epilepsies, and insular lesions. In fact, a majority of complex stereoelectroencephalography procedures will include at least one electrode targeting the insula...
July 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28643127/preoperative-evaluation-of-left-common-iliac-vein-in-oblique-lateral-interbody-fusion-at-l5-s1
#6
Nam-Su Chung, Chang-Hoon Jeon, Han-Dong Lee, Heon-Ju Kweon
PURPOSE: Oblique lateral interbody fusion (OLIF) L5-S1 is essentially to perform an anterior lumbar interbody fusion (ALIF) in the lateral position. Because the surgical procedures are performed "obliquely" over the left common iliac vein (LCIV), ensuring that the vein is protected which is particularly important. We aimed to evaluate the configuration of LCIV and its risk of mobilization during anterior approach at L5-S1 segment. METHODS: This study involved 65 consecutive patients who underwent anterior lumbar fusion (ALIF, n = 39; OLIF, n = 26) at the L5-S1 segment...
June 22, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28641973/changes-in-hip-knee-and-ankle-coronal-alignments-after-total-hip-arthroplasty-with-transverse-femoral-shortening-osteotomy-for-unilateral-crowe-type-iv-developmental-dysplasia-of-the-hip
#7
Abdulhamit Misir, Turan B Kizkapan, Kadir I Yildiz, Mehmet A Kaygusuz, Yakup Alpay, Atakan Ezici
BACKGROUND: To investigate changes in lower extremity coronal alignment in patients with unilateral Crowe type IV developmental dysplasia of the hip who underwent total hip arthroplasty with transverse femoral shortening osteotomy. METHODS: We reviewed the preoperative and 1-year postoperative full-length lower extremity radiographs of 25 patients. Femoral offset (FO), mechanical hip-knee-ankle angle, anatomical axis, mechanical axis deviation (MAD), mechanical lateral proximal femoral angle, anatomical medial proximal femoral angle, mechanical lateral distal femoral angle, anatomical lateral distal femoral angle, knee joint line congruency angle, mechanical medial proximal tibial angle, mechanical lateral distal tibial angle, ankle joint line orientation angle, tibial plafond talus angle, extremity length, and pelvic obliquity were measured on both the operative and nonoperative sides...
June 1, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28639387/determining-the-orientation-angle-of-directional-leads-for-deep-brain-stimulation-using-computed-tomography-and-digital-x-ray-imaging-a-phantom-study
#8
Alexander Sitz, Mauritius Hoevels, Alexandra Hellerbach, Andreas Gierich, Klaus Luyken, Till A Dembek, Martin Klehr, Jochen Wirths, Veerle Visser-Vandewalle, Harald Treuer
PURPOSE: Orientating the angle of directional leads for deep brain stimulation (DBS) in an axial plane introduces a new degree of freedom that is indicated by embedded anisotropic directional markers. Our aim was to develop algorithms to determine lead orientation angles from computed tomography (CT) and stereotactic x-ray imaging using standard clinical protocols, and subsequently assess the accuracy of both methods. METHODS: In CT the anisotropic marker artifact was taken as a signature of the lead orientation angle and analyzed using discrete Fourier transform of circular intensity profiles...
June 22, 2017: Medical Physics
https://www.readbyqxmd.com/read/28639113/ergonomic-strategies-to-improve-radiographers-posture-during-mammography-activities
#9
Nicolai Cernean, Florentino Serranheira, Pedro Gonçalves, Cláudia Sá Dos Reis
OBJECTIVES: To identify alternatives for radiographers' postures while performing mammography that can contribute to reduce the risk of work-related musculoskeletal disorders (WRMSDs). METHODS: Radiographers' postures to positioning craniocaudal (CC) and mediolateral oblique (MLO) views were simulated without any intervention for three scenarios: radiographer/patient with similar statures, radiographer smaller than patient and radiographer taller than patient. Actions were taken to modify the postures: seated radiographer; patient on a step; seated patient; radiographer on a step...
June 21, 2017: Insights Into Imaging
https://www.readbyqxmd.com/read/28637987/three-dimensional-finite-element-analysis-of-the-effects-of-implant-diameter-and-photofunctionalization-on-peri-implant-stress
#10
Tetsuo Ohyama, Hiroyasu Yasuda, Norio Shibuya, Satomi Tadokoro, Shinya Nakabayashi, Shunsuke Namaki, Yaeko Hara, Takahiro Ogawa, Tomohiko Ishigami
Previous finite element analyses of peri-implant stress assumed a bone-implant contact (BIC) ratio of 100%, even though the BIC ratio is known to be approximately 50% or less. However, the recent development of ultraviolet treatment of titanium immediately before use, known as photofunctionalization, significantly increased the BIC ratio, to 98.2%. We used a unique finite element analysis model that enabled us to examine the effects of different BIC ratios on peri-implant stress. A three-dimensional model was constructed under conditions of vertical or oblique loading, an implant diameter of 3...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28637153/dutch-version-of-the-fear-of-pain-questionnaire-for-adolescents-with-chronic-pain
#11
Carolien Dekker, Caroline H G Bastiaenen, Janneke E de Vries, Laura E Simons, Mariëlle E J B Goossens, Jeanine A M C F Verbunt
BACKGROUND: Fear of pain is important in the development and maintenance of chronic pain. The Fear of Pain Questionnaire-Child version has been developed to assess pain related fear in children and adolescents. OBJECTIVE: Translating the original questionnaire into Dutch, and investigating internal consistency and construct validity to enable use in the Dutch pain rehabilitation setting for treatment and research. METHODS: Cross-sectional validation study: After forward and back translation of the FOPQ-C, adolescents (11-22 years old) with chronic musculoskeletal pain completed an assessment containing the Dutch Fear of Pain Questionnaire, and questionnaires about demographics, pain catastrophizing, functional disability, and pain intensity...
March 3, 2017: Disability and Rehabilitation
https://www.readbyqxmd.com/read/28633796/cotton-osteotomy-in-flatfoot-reconstruction-a-case-report-highlighting-surgical-technique-and-modified-incision-to-protect-the%C3%A2-medial-dorsal-cutaneous-nerve
#12
Troy J Boffeli, Katherine R Schnell
The Cotton osteotomy or opening wedge medial cuneiform osteotomy is a useful adjunctive flatfoot reconstructive procedure that is rarely performed in isolation. The Cotton procedure is relatively quick to perform and effectively corrects forefoot varus deformity after rearfoot fusion or osteotomy to achieve a rectus forefoot to rearfoot relationship. Proper patient selection is critical, because preoperative findings of medial column joint instability, concomitant hallux valgus deformity, or degenerative joint disease of the medial column might be better treated with arthrodesis of the naviculocuneiform or first tarsometatarsal joints...
July 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28632896/reliability-of-a-novel-approach-for-quadriceps-motor-point-assessment
#13
Ada Weiss, Neal R Glaviano, Jacob Resch, Susan Saliba
INTRODUCTION: We studied the ability of clinicians to identify quadriceps motor points using a transcutaneous electrical stimulation unit(TENS). METHODS: Twenty-two certified athletic trainers and one expert-rater identified the seven motor points of the quadriceps at two time points separated by one week. The difference was calculated between where each participant and the expert-rater identified each motor point using an x-y coordinate system. Bland-Altman plots were used to compare differences between two testing sessions...
June 20, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28632066/differences-in-trunk-and-thigh-muscle-strength-endurance-and-thickness-between-elite-sailors-and-non-sailors
#14
Bernd Friesenbichler, Julia F Item-Glatthorn, Fabian Neunstöcklin, Nicola C Casartelli, Gaël Guilhem, Nicola A Maffiuletti
Dinghy sailors lean their upper body over the windward side of the boat ('hiking') to keep the boat's balance and maximise its speed. Sustaining the hiking position is essential for competitive performance and this study examined sport-specific differences of muscles relevant for hiking in elite sailors. Knee extensor muscle strength as well as trunk muscle strength, muscle endurance and muscle thickness were assessed in elite dinghy sailors (n = 15) and compared to matched, non-sailing controls (n = 15)...
March 1, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28631147/the-motor-cortical-representation-of-a-muscle-is-not-homogeneous-in-brain-connectivity
#15
Jo Armour Smith, Alaa Albishi, Sarine Babikian, Skulpan Asavasopon, Beth E Fisher, Jason J Kutch
Functional connectivity patterns of the motor cortical representational area of single muscles have not been extensively mapped in humans, particularly for the axial musculature. Functional connectivity may provide a neural substrate for adaptation of muscle activity in axial muscles that have both voluntary and postural functions. The purpose of this study was to combine brain stimulation and neuroimaging to both map the cortical representation of the external oblique (EO) in primary motor cortex (M1) and supplementary motor area (SMA), and to establish the resting-state functional connectivity associated with this representation...
June 19, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28630862/influence-of-deformation-and-stress-between-bone-and-implant-from-various-bite-forces-by-numerical-simulation-analysis
#16
Hsin-Chung Cheng, Boe-Yu Peng, May-Show Chen, Chiung-Fang Huang, Yi Lin, Yung-Kang Shen
Endosseous oral implant is applied for orthodontic anchorage in subjects with multiple tooth agenesis. Its effectiveness under orthodontic loading has been demonstrated clinically and experimentally. This study investigates the deformation and stress on the bone and implant for different bite forces by three-dimensional (3D) finite element (FE) methods. A numerical simulation of deformation and stress distributions around implants was used to estimate the survival life for implants. The model was applied to determine the pattern and distribution of deformations and stresses within the endosseous implant and on supporting tissues when the endosseous implant is used for orthodontic anchorage...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28630854/stacked-flexible-nailing-for-radius-ulna-fractures-revival-of-a-lost-technique
#17
Qaed Dhariwal, Parvez Inamdar, Pankush Arora, Ashok Shyam
INTRODUCTION: Simultaneous radius and ulna fractures are common in adults and generally osteosynthesis with plating is the treatment of choice. Nailing of such fractures is infrequently advocated. We present our unique technique of radius ulna nailing in adults to achieve closed reduction and early predictable union with minimal or no complications. CASE REPORT: Case 1: 22 year old male with midshaft both bones forearm fracture was treated with stacked nailing. Two 2...
January 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28630496/analytical-solutions-of-the-radiative-transport-equation-for-turbid-and-fluorescent-layered-media
#18
André Liemert, Dominik Reitzle, Alwin Kienle
Accurate and efficient solutions of the three dimensional radiative transport equation were derived in all domains for the case of layered scattering media. Index mismatched boundary conditions based on Fresnel's equations were implemented. Arbitrary rotationally symmetric phase functions can be applied to characterize the scattering in the turbid media. Solutions were derived for an obliquely incident beam having arbitrary spatial profiles. The derived solutions were successfully validated with Monte Carlo simulations and partly compared with analytical solutions of the diffusion equation...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28629157/wuhan-ionospheric-oblique-backscattering-sounding-system-and-its-applications-a-review
#19
REVIEW
Shuzhu Shi, Guobin Yang, Chunhua Jiang, Yuannong Zhang, Zhengyu Zhao
For decades, high-frequency (HF) radar has played an important role in sensing the Earth's environment. Advances in radar technology are providing opportunities to significantly improve the performance of HF radar, and to introduce more applications. This paper presents a low-power, small-size, and multifunctional HF radar developed by the Ionospheric Laboratory of Wuhan University, referred to as the Wuhan Ionospheric Oblique Backscattering Sounding System (WIOBSS). Progress in the development of this radar is described in detail, including the basic principles of operation, the system configuration, the sounding waveforms, and the signal and data processing methods...
June 18, 2017: Sensors
https://www.readbyqxmd.com/read/28628645/effect-of-horizontal-rectus-surgery-for-the-correction-of-intermittent-exotropia-on-sub-a-or-sub-v-pattern
#20
Young Bok Lee, Soolienah Rhiu, Joo Yeon Lee, Mi Young Choi, Hae Jung Paik, Key Hwan Lim, Dong Gyu Choi
We evaluated effect of horizontal rectus surgery on sub-A or sub-V pattern intermittent exotropia. We enrolled patients with sub-A or sub-V pattern intermittent exotropia. The sub-A pattern was diagnosed when the eyes diverged less than 10 prism diopters (PD) from upgaze to downgaze, and sub-V pattern when the divergence was 14 PD or less from downgaze to upgaze. Patients had undergone horizontal rectus surgery without vertical transposition of horizontal rectus muscle or oblique muscle weakening. The patients were divided into two groups: sub-A pattern (group A) and sub-V pattern (group V)...
2017: PloS One
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