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https://www.readbyqxmd.com/read/28942683/a-comparison-of-plate-versus-screw-fixation-for-segmental-scaphoid-fractures-a-biomechanical-study
#1
Jill A Goodwin, Paulo Castañeda, Ryan P Shelhamer, Liam C Bosch, Scott G Edwards
BACKGROUND: Volar locking plate fixation may offer several advantages over headless screw fixation for scaphoid nonunion, or segmental or comminuted fractures: (1) increased surface area for bony healing; (2) preserved vascularity; and (3) maintenance of a gap for graft insertion. The purpose of this study is to compare headless screw and locking plate fixation of segmental scaphoid fractures and to determine whether either fixation provides a greater mechanical advantage in osteoporotic versus nonosteoporotic bone...
September 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28938625/predictive-value-of-preoperative-retinal-nerve-fiber-layer-thickness-for-postoperative-visual-recovery-in-patients-with-chiasmal-compression
#2
Jing Zhang, Sunfu Zhang, Yanlin Song, Chenjing Zhu, Min He, Qingqing Ren, Baoyin Shan, Ziqiong Wang, Yunhui Zeng, Jianguo Xu
The aim of this study was to evaluate the predictive role of preoperative retinal nerve fiber layer (RNFL) thickness for postoperative visual recovery in patients with chiasmal compression through performing a meta-analysis. PubMed, EMBASE, Cochrane Library and China National Knowledge Infrastructure were searched for relevant studies. The study and patient characteristics were extracted. Pooled odds ratio (OR) with 95% confidence interval (CI) was calculated to estimate the predictive value of RNFL thickness...
August 29, 2017: Oncotarget
https://www.readbyqxmd.com/read/28937456/is-1-stage-posterior-corpectomy-more-favorable-compared-with-decompression-with-fusion-to-control-thoracic-cord-compression-by-metastasis
#3
Dae Geun Kim, Jung-Ki Ha, Chang Ju Hwang, Dong-Ho Lee, Choon Sung Lee, Jae Hwan Cho
STUDY DESIGN: A retrospective comparative study OBJECTIVE:: To compare 1-stage posterior corpectomy to decompression with fusion for the control of thoracic cord compression due to a metastatic tumor. SUMMARY OF BACKGROUND DATA: Thoracic cord compression by a metastatic tumor can cause back pain, paralysis, and urinary/bowel dysfunction and is generally treated by palliative decompressive surgery. However, no studies have assessed the advantages of 1-stage posterior corpectomy compared with decompression with fusion...
October 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28937455/palliative-surgery-for-spinal-metastases-using-posterior-decompression-and-fixation-combined-with-intraoperative-vertebroplasty
#4
Liang Dong, Mingsheng Tan, Di Wu, Ping Yi, Feng Yang, Xiangsheng Tang, Qingying Hao
STUDY DESIGN: Retrospective study. OBJECTIVE: To evaluate the clinical outcome of palliative surgery using posterior decompression and fixation combined with intraoperative vertebroplasty (PDFIV) for the treatment of spinal metastases, and analyze the indications for PDFIV using a neurological, oncologic, mechanical, and systemic framework. SUMMARY OF BACKGROUND DATA: Palliative surgery is widely used to spinal metastatic patients with poor condition for enough postoperative recovery...
October 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28933244/ventricular-fibrillation-and-myocardial-depression-following-pulmonary-valve-replacement-in-tetralogy-of-fallot-with-an-intramural-coronary-artery-and-coronary-artery-compression-by-chest-tube
#5
Mubbasheer Ahmed, Nathan E Thompson, Susan R Foerster, Michele A Frommelt, Michael E Mitchell, John P Scott
We describe the case of a 10-year-old male with a history of repaired Tetralogy of Fallot and known intramural right coronary artery (RCA) who presented for bioprosthetic pulmonary valve replacement. The operation was complicated by postoperative ventricular fibrillation arrest. Selective coronary angiography revealed external compression of the mid-RCA by a mediastinal chest tube that improved immediately upon removal of the tube. Ultimately, the patient required additional unroofing of the intramural coronary for full recovery...
January 1, 2017: World Journal for Pediatric & Congenital Heart Surgery
https://www.readbyqxmd.com/read/28932236/quantitative-evaluation-of-temporal-regularizers-in-compressed-sensing-dynamic-contrast-enhanced-mri-of-the-breast
#6
Dong Wang, Lori R Arlinghaus, Thomas E Yankeelov, Xiaoping Yang, David S Smith
PURPOSE: Dynamic contrast enhanced magnetic resonance imaging (DCE-MRI) is used in cancer imaging to probe tumor vascular properties. Compressed sensing (CS) theory makes it possible to recover MR images from randomly undersampled k-space data using nonlinear recovery schemes. The purpose of this paper is to quantitatively evaluate common temporal sparsity-promoting regularizers for CS DCE-MRI of the breast. METHODS: We considered five ubiquitous temporal regularizers on 4...
2017: International Journal of Biomedical Imaging
https://www.readbyqxmd.com/read/28923319/mechanics-of-pharmaceutical-pellets-constitutive-properties-deformation-and-breakage-behavior-%C3%A2
#7
Alexander Russell, Rok Šibanc, Rok Dreu, Peter Müller
To ensure robust manufacturing of unit-based oral solid dosage forms with minimal structural imperfections and high mechanical reliability across subsequent processing unit operations (for e.g. withstanding mechanical stresses during coating, optional axial compression, handling, packaging, storage and transport conditions), process design should include consideration of precise limits of accurate micro, macro and bulk properties of the constituent pellets. This communication presents a comprehensive intricate database of micro-mechanical properties' and breakage probability distribution functions of pellets, illustrating the stiffening and strengthening effects of coatings and the softening and weakening effects of structural moisture...
September 15, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28917232/compressed-food-with-added-functional-oligopeptides-improves-performance-during-military-endurance-training
#8
Zhi-Qiang Zheng, Zhan-Hui Geng, Jia-Xi Liu, Shun-Tang Guo
BACKGROUND AND OBJECTIVES: Oligosaccharide or oligopeptide supplementation may have a significant impact on endurance performance. This study evaluated the effects of adding maltooligosaccharides (MO) or soy oligopeptides (SO) to compressed food (CF) on the physical response of soldiers to daily military training. METHODS AND STUDY DESIGN: Twelve soldiers were randomized to four diet groups: regular meals, CF, CFMO, and CFSO (crossover design). They participated in exercise tests including 90 minutes running at 55-65% VO2max and exhaustive running...
2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28914655/percutaneous-nucleoplasty-for-the-treatment-of-a-contained-cervical-disk-herniation
#9
Judith D de Rooij, Pravesh S Gadjradj, John S Soria van Hoeve, Frank J Huygen, Hans A Aukes, Biswadjiet S Harhangi
Cervical radiculopathy is characterized by compression of the roots of the nerve. When conservative treatment fails and symptoms persist or increase in severity, surgical treatment is considered. Anterior cervical discectomy with or without fusion is regarded as the standard treatment for cervical disk herniation. Recently, there is an evolving trend in spinal surgery towards less invasive techniques. Nucleoplasty is a minimally invasive technique in which radiofrequency technology is used for percutaneous decompression...
September 13, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28912650/the-effects-combining-cryocompression-therapy-following-an-acute-bout-of-resistance-exercise-on-performance-and-recovery
#10
William H DuPont, Brek J Meuris, Vincent H Hardesty, Emily C Barnhart, Landon H Tompkins, Morricia J P Golden, Clayton J Usher, Paul A Spence, Lydia K Caldwell, Emily M Post, Matthew K Beeler, William J Kraemer
Compression and cold therapy used separately have shown to reduce negative effects of tissue damage. The combining compression and cold therapy (cryocompression) as a single recovery modality has yet to be fully examined. To examine the effects of cryocompression on recovery following a bout of heavy resistance exercise, recreationally resistance trained men (n =16) were recruited, matched, and randomly assigned to either a cryocompression group (CRC) or control group (CON). Testing was performed before and then immediately after exercise, 60 minutes, 24 hours, and 48 hours after a heavy resistance exercise workout (barbell back squats for 4 sets of 6 reps at 80% 1RM, 90 sec rest between sets, stiff legged deadlifts for 4 sets of 8 reps at 1...
September 2017: Journal of Sports Science & Medicine
https://www.readbyqxmd.com/read/28900263/physicochemical-stability-and-transfection-efficiency-of-cationic-amphiphilic-copolymer-pdna-polyplexes-for-spinal-cord-injury-repair
#11
So-Jung Gwak, Christian Macks, Sooneon Bae, Noah Cecil, Jeoung Soo Lee
Multiple age-related and injury-induced characteristics of the adult central nervous system (CNS) pose barriers to axonal regeneration and functional recovery following injury. In situ gene therapy is a promising approach to address the limited availability of growth-promoting biomolecules at CNS injury sites. The ultimate goal of our work is to develop, a cationic amphiphilic copolymer for simultaneous delivery of drug and therapeutic nucleic acids to promote axonal regeneration and plasticity after spinal cord injury...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28894816/evaluation-of-peripheral-nerve-regeneration-through-biomaterial-conduits-via-micro-ct-imaging
#12
Sarah K Pixley, Tracy M Hopkins, Kevin J Little, David B Hom
OBJECTIVE: Hollow nerve conduits made of natural or synthetic biomaterials are used clinically to aid regeneration of peripheral nerves damaged by trauma or disease. To support healing, conduit lumen patency must be maintained until recovery occurs. New methods to study conduit structural integrity would provide an important means to optimize conduits in preclinical studies. We explored a novel combined technique to examine structural integrity of two types of nerve conduits after in vivo healing...
December 2016: Laryngoscope Investigative Otolaryngology
https://www.readbyqxmd.com/read/28894681/preoperative-computed-tomography-myelography-parameters-as-predictors-of-outcome-in-patients-with-degenerative-cervical-myelopathy-results-of-a-systematic-review
#13
Feras J Waly, Fahad H Abduljabbar, Maryse Fortin, Anas Nooh, Michael Weber
STUDY DESIGN: Systematic review. OBJECTIVES: To determine the preoperative computed tomography (CT) myelogram imaging parameters in patients diagnosed with degenerative cervical myelopathy (DCM) that correlate with severity of DCM and predict postoperative patients' functional outcome. METHODS: An electronic database search was performed using Ovid Medline and Embase. CT myelogram studies investigating the correlation between imaging characteristics and DCM severity or postoperative outcomes were included...
September 2017: Global Spine Journal
https://www.readbyqxmd.com/read/28893337/optimization-of-three-dimensional-3d-chemical-imaging-by-soft-x-ray-spectro-tomography-using-a-compressed-sensing-algorithm
#14
Juan Wu, Mirna Lerotic, Sean Collins, Rowan Leary, Zineb Saghi, Paul Midgley, Slava Berejnov, Darija Susac, Juergen Stumper, Gurvinder Singh, Adam P Hitchcock
Soft X-ray spectro-tomography provides three-dimensional (3D) chemical mapping based on natural X-ray absorption properties. Since radiation damage is intrinsic to X-ray absorption, it is important to find ways to maximize signal within a given dose. For tomography, using the smallest number of tilt series images that gives a faithful reconstruction is one such method. Compressed sensing (CS) methods have relatively recently been applied to tomographic reconstruction algorithms, providing faithful 3D reconstructions with a much smaller number of projection images than when conventional reconstruction methods are used...
September 12, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28888318/under-pressure-applying-practice-based-learning-and-improvement-to-the-treatment-of-chronic-neuropathic-pain-in-patients-with-burns
#15
REVIEW
Mihaela Rapolti, Cindy Wu, Olga A Schuth, Charles Scott Hultman
Chronic neuropathic pain after burn injury may have multiple causes, such as direct nerve injury, nerve compression, or neuroma formation, and can significantly impair quality of life and limit functional recovery. Management includes a team-based approach that involves close collaboration between occupational and physical therapists, plastic surgeons, and experts in chronic pain, from neurology, anesthesia, psychiatry, and physiatry. Carefully selected patients with an anatomic cause of chronic neuropathic pain unequivocally benefit from surgical intervention...
October 2017: Clinics in Plastic Surgery
https://www.readbyqxmd.com/read/28881116/surgical-roles-for-spinal-involvement-of-hematological-malignancies
#16
Sang-Il Kim, Young-Hoon Kim, Kee-Yong Ha, Jae-Won Lee, Jin-Woo Lee
OBJECTIVE: Patients with hematological malignancies frequently encounter spine-related symptoms, which are caused by disease itself or process of treatment. However, there is still lack of knowledge on their epidemiology and clinical courses. The purpose of this article is to review clinical presentations and surgical results for spinal involvement of hematologic malignancies. METHODS: From January 2011 to September 2014, 195 patients (98 males and 97 females) suffering from hematological malignancies combined with spinal problems were retrospectively analyzed for clinical and radiological characteristics and their clinical results...
September 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28880433/the-effect-of-hydroxyapatite-nanoparticles-on-mechanical-behavior-and-biological-performance-of-porous-shape-memory-polyurethane-scaffolds
#17
Juhong Yu, Hong Xia, Akira Teramoto, Qing-Qing Ni
The scaffold which provides space for cell growth, proliferation and differentiation, is a key factor in bone tissue engineering. However, improvements in scaffold design are needed to precisely match the irregular boundaries of bone defects as well as facilitate clinical application. In this study, controllable three-dimensional (3D) porous shape memory polyurethane/nano-hydroxyapatite (SMPU/nHAP) composite scaffold was successfully fabricated for bone defect reparation. Detailed studies were performed to evaluate its structure, apparent density, porosity and mechanical properties, emphasizing the contribution of nHAP particles on shape recovery behaviors and biological performance in vitro...
September 7, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28877036/recovery-from-ropivacaine-induced-or-levobupivacaine-induced-cardiac-arrest-in-rats-comparison-of-lipid-emulsion-effects
#18
Masashi Yoshimoto, Takashi Horiguchi, Tetsu Kimura, Toshiaki Nishikawa
BACKGROUND: Lipid emulsion treatment appears to have application in the treatment of local anesthetic-induced cardiac arrest. To examine whether the efficacy of lipid resuscitation in the treatment of local anesthetic-induced cardiac arrest is affected by lipophilicity, the effects of lipid infusions were compared between levobupivacaine-induced (high lipophilicity) and ropivacaine-induced (lower lipophilicity) rat cardiac arrest model. METHODS: A total of 28 female Sprague-Dawley rats were anesthetized using sevoflurane, which subsequently underwent tracheostomy, followed by femoral artery and vein cannulation...
September 2, 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28874746/rgma-inhibition-with-human-monoclonal-antibodies-promotes-regeneration-plasticity-and-repair-and-attenuates-neuropathic-pain-after-spinal-cord-injury
#19
Andrea J Mothe, Nardos G Tassew, Alirezha P Shabanzadeh, Romeo Penheiro, Robin J Vigouroux, Lili Huang, Christine Grinnell, Yi-Fang Cui, Emma Fung, Philippe P Monnier, Bernhard K Mueller, Charles H Tator
Traumatic spinal cord injury (SCI) causes a cascade of degenerative events including cell death, axonal damage, and the upregulation of inhibitory molecules which prevent regeneration and limit recovery. Repulsive guidance molecule A (RGMa) is a potent neurite growth inhibitor in the central nervous system, exerting its repulsive activity by binding the Neogenin receptor. Here, we show for the first time that inhibitory RGMa is markedly upregulated in multiple cell types after clinically relevant impact-compression SCI in rats, and importantly, also in the injured human spinal cord...
September 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28872596/survey-of-veterinarians-using-a-novel-physical-compression-squeeze-procedure-in-the-management-of-neonatal-maladjustment-syndrome-in-foals
#20
Monica Aleman, Kalie M Weich, John E Madigan
Horses are a precocious species that must accomplish several milestones that are critical to survival in the immediate post-birth period for their survival. One essential milestone is the successful transition from the intrauterine unconsciousness to an extrauterine state of consciousness or awareness. This transition involves a complex withdrawal of consciousness inhibitors and an increase in neuroactivating factors that support awareness. This process involves neuroactive hormones as well as inputs related to factors such as cold, visual, olfactory, and auditory stimuli...
September 5, 2017: Animals: An Open Access Journal From MDPI
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