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https://www.readbyqxmd.com/read/28340364/cervical-facet-force-analysis-after-disc-replacement-versus-fusion
#1
Vikas V Patel, Zachary R Wuthrich, Kirk C McGilvray, Matthew C Lafleur, Emily M Lindley, Derrick Sun, Christian M Puttlitz
BACKGROUND: Cervical total disc replacement was developed to preserve motion and reduce adjacent-level degeneration relative to fusion, yet concerns remain that total disc replacement will lead to altered facet joint loading and long-term facet joint arthrosis. This study is intended to evaluate changes in facet contact force, pressure and surface area at the treated and superior adjacent levels before and after discectomy, disc replacement, and fusion. METHODS: Ten fresh-frozen human cadaveric cervical spines were potted from C2 to C7 with pressure sensors placed into the facet joints of C3-C4 and C4-C5 via slits in the facet capsules...
March 18, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28333575/is-clinical-measurement-of-anatomic-axis-of-the-femur-adequate
#2
Chi-Chuan Wu
Background and purpose - The accuracy of using clinical measurement from the anterior superior iliac spine (ASIS) to the center of the knee to determine an anatomic axis of the femur has rarely been studied. A radiographic technique with a full-length standing scanogram (FLSS) was used to assess the adequacy of the clinical measurement. Patients and methods - 100 consecutive young adult patients (mean age 34 (20-40) years) with chronic unilateral lower extremity injuries were studied. The pelvis and intact contralateral lower extremity images in the FLSS were selected for study...
March 23, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28332992/clinical-implementation-of-a-model-based-in%C3%A2-vivo-dose-verification-system-for-stereotactic-body-radiation-therapy-volumetric-modulated-arc-therapy-treatments-using-the-electronic-portal-imaging-device
#3
Peter M McCowan, Ganiyu Asuni, Eric Van Uytven, Timothy VanBeek, Boyd M C McCurdy, Shaun K Loewen, Naseer Ahmed, Bashir Bashir, James B Butler, Amitava Chowdhury, Arbind Dubey, Ahmet Leylek, Maged Nashed
PURPOSE: To report findings from an in vivo dosimetry program implemented for all stereotactic body radiation therapy patients over a 31-month period and discuss the value and challenges of utilizing in vivo electronic portal imaging device (EPID) dosimetry clinically. METHODS AND MATERIALS: From December 2013 to July 2016, 117 stereotactic body radiation therapy-volumetric modulated arc therapy patients (100 lung, 15 spine, and 2 liver) underwent 602 EPID-based in vivo dose verification events...
April 1, 2017: International Journal of Radiation Oncology, Biology, Physics
https://www.readbyqxmd.com/read/28332867/age-related-changes-in-thoracic-skeletal-geometry-of-elderly-females
#4
Sven A Holcombe, Stewart C Wang, James B Grotberg
OBJECTIVE: Both females and the elderly have been identified as vulnerable populations with increased injury and mortality risk in multiple crash scenarios. Particularly in frontal impacts, older females show higher risk to the chest and thorax than their younger or male counterparts. Thoracic geometry plays a role in this increase, and this study aims to quantify key parts of that geometry in a way that can directly inform human body models that incorporate the concept of person age...
March 23, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28332172/quantitative-ultrasound-and-dxa-measurements-in-aromatase-inhibitor-treated-breast-cancer-women-receiving-denosumab
#5
A Catalano, A Gaudio, N Morabito, G Basile, R M Agostino, A Xourafa, M Atteritano, E Morini, G Natale, A Lasco
PURPOSE: Denosumab has been proven to reduce fracture risk in breast cancer (BC) women under aromatase inhibitors (AIs). Quantitative ultrasound (QUS) provides information on the structure and elastic properties of bone. Our aim was to assess bone health by phalangeal QUS and by dual-energy X-ray absorptiometry (DXA), and to evaluate bone turnover in AIs-treated BC women receiving denosumab. METHODS: 35 Postmenopausal BC women on AIs were recruited (mean age 61...
March 22, 2017: Journal of Endocrinological Investigation
https://www.readbyqxmd.com/read/28331220/identification-of-biallelic-extl3-mutations-in-a-novel-type-of-spondylo-epi-metaphyseal-dysplasia
#6
Long Guo, Nursel H Elcioglu, Shuji Mizumoto, Zheng Wang, Bilge Noyan, Hatice M Albayrak, Shuhei Yamada, Naomichi Matsumoto, Noriko Miyake, Gen Nishimura, Shiro Ikegawa
Spondylo-epi-metaphyseal dysplasia (SEMD) is a group of inherited skeletal diseases characterized by the anomalies in spine, epiphyses and metaphyses. SEMD is highly heterogeneous and >20 distinct entities have been identified. Here we describe a novel type of SEMD in two unrelated Turkish patients who presented with severe platyspondyly, kyphoscoliosis, pelvic distortion, constriction of the proximal femora and brachydactyly. Although these phenotypes overlap considerably with some known SEMDs, they had a novel causal gene, exostosin-like glycosyltransferase 3 (EXTL3), that encodes a glycosyltransferase involved in the synthesis of heparin and heparan sulfate...
March 23, 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/28327433/sonographic-prediction-of-outcome-of-vacuum-deliveries-a-multicenter-prospective-cohort-study
#7
Birgitte H Kahrs, Sana Usman, Tullio Ghi, Aly Youssef, Erik A Torkildsen, Elsa Lindtjørn, Tilde B Østborg, Sigurlaug Benediktsdottir, Lis Brooks, Lotte Harmsen, Pål R Romundstad, Kjell Å Salvesen, Christoph C Lees, Torbjørn M Eggebø
BACKGROUND: Safe management of the second stage of labor is of great importance. Unnecessary interventions should be avoided and correct timing of interventions focused. Ultrasound assessment of fetal position and station has a potential to improve the precision in diagnosing and managing prolonged or arrested labors. The decision to perform vacuum delivery is traditionally based on subjective assessment by digital vaginal examination and clinical expertise and there is currently no method of objectively quantifying the likelihood of successful delivery...
March 18, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28326929/dendritic-spine-dysgenesis-in-superficial-dorsal-horn-sensory-neurons-after-spinal-cord-injury
#8
Xiaoyu C Cao, Laura W Pappalardo, Stephen G Waxman, Andrew M Tan
Neuropathic pain is a major complication of spinal cord injury, and despite aggressive efforts, this type of pain is refractory to available clinical treatment. Our previous work has demonstrated a structure-function link between dendritic spine dysgenesis on nociceptive sensory neurons in the intermediate zone, laminae IV/V, and chronic pain in central nervous system and peripheral nervous system injury models of neuropathic pain. To extend these findings, we performed a follow-up structural analysis to assess whether dendritic spine remodeling occurs on superficial dorsal horn neurons located in lamina II after spinal cord injury...
January 2017: Molecular Pain
https://www.readbyqxmd.com/read/28324978/influence-of-electrode-configuration-on-the-electric-field-distribution-during-transcutaneous-spinal-direct-current-stimulation-of-the-cervical-spine
#9
Sofia R Fernandes, Ricardo Salvador, Cornelia Wenger, Mamede A de Carvalho, Pedro C Miranda
Transcutaneous spinal direct current stimulation (tsDCS) is a recent technique with promising neuromodulatory effects on spinal neuronal circuitry. The main objective of the present study was to perform a finite element analysis of the electric field distribution in tsDCS in the cervical spine region, with varying electrode configurations and geometry. A computational model of a human trunk was generated with nine tissue meshes. Three electrode configurations were tested: A) rectangular saline-soaked sponge target and return electrodes placed over C3 and T3 spinous processes, respectively; B1) circular saline-soaked sponge target and return electrodes placed over C7 spinous process and right deltoid muscle, respectively; B2) same configuration as B1, considering circular shaped electrodes with sponge and rubber layers and a small circular connector on the top surface...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324216/new-classification-for-the-treatment-of-pyogenic-spondylodiscitis-validation-study-on-a-population-of-250-patients-with-a-follow-up-of-2%C3%A2-years
#10
Enrico Pola, G Autore, V M Formica, V Pambianco, D Colangelo, R Cauda, M Fantoni
PURPOSE: Pyogenic spondylodiscitis (PS) is still burdened by a high rate of orthopedic and neurological complications. Despite the rising incidence, the choice of a proper orthopedic treatment is often delayed by the lack of clinical data. The aim of this study was to propose a clinical-radiological classification of pyogenic spondylodiscitis to define a standard treatment algorithm. METHODS: Based on data from 250 patients treated from 2008 to 2015, a clinical-radiological classification of pyogenic spondylodiscitis was developed...
March 21, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28324031/sex-steroid-hormones-and-fracture-in-a-multi-ethnic-cohort-of-women-the-women-s-health-initiative-study-whi
#11
Jane A Cauley, Michelle E Danielson, Guru Rajesh Jammy, Doug C Bauer, Rebecca Jackson, Jean Wactawski-Wende, Rowan T Chlebowski, Kristine E Ensrud, Robert Boudreau
CONTEXT: We hypothesize that endogenous sex steroids are associated with fracture risk independent of race/ethnicity. DESIGN AND SETTING: We performed a nested case-control study within the prospective Women's Health Initiative Observational Study (WHI-OS). Incident non-spine fractures were identified in 381 Black, 192 Hispanic, 112 Asian, and 46 Native American women over an average of 8.6 years. A random sample of 400 White women who experienced an incident fracture was chosen...
January 25, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323797/local-antibiotic-therapy-to-reduce-infection-after-operative-treatment-of-fractures-at-high-risk-of-infection-a-multicenter-randomized-controlled-trial-vanco-study
#12
Robert V OʼToole, Manjari Joshi, Anthony R Carlini, Clinton K Murray, Lauren E Allen, Daniel O Scharfstein, Joshua L Gary, Michael J Bosse, Renan C Castillo
A number of clinical studies in the spine literature suggest that the use of local vancomycin powder may substantially reduce surgical site infections (SSIs). These studies are primarily retrospective and observational and few focus on orthopaedic trauma patients. This study is a phase III, prospective, randomized, clinical trial to assess the efficacy of locally administered vancomycin powder in the prevention of SSI after fracture surgery. The primary goal of the VANCO Study is to compare the proportion of deep SSI 6 months after fracture fixation surgery...
April 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28323709/single-stage-transpedicular-vertebrectomy-and-expandable-cage-placement-for-treatment-of-unstable-mid-and-lower-lumbar-burst-fractures
#13
Jong-Il Choi, Bum-Joon Kim, Sung-Kon Ha, Sang-Dae Kim, Dong-Jun Lim, Se-Hoon Kim
STUDY DESIGN: Retrospective clinical and radiographic study. OBJECTIVE: To examine the efficacy and safety of vertebrectomy and expandable cage placement by a single-stage posterior approach for unstable mid and lower lumbar burst fractures (below the L3). SUMMARY OF BACKGROUND DATA: Patients with unstable mid and lower lumbar burst fractures require surgical treatment to relieve pain, address paralysis, and stabilize the spine to prevent further segmental deformity...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28323283/treadmill-exercise-suppressed-stress-induced-dendritic-spine-elimination-in-mouse-barrel-cortex-and-improved-working-memory-via-bdnf-trkb-pathway
#14
K Chen, L Zhang, M Tan, C S W Lai, A Li, C Ren, K-F So
Stress-related memory deficit is correlated with dendritic spine loss. Physical exercise improves memory function and promotes spinogenesis. However, no studies have been performed to directly observe exercise-related effects on spine dynamics, in association with memory function. This study utilized transcranial two-photon in vivo microscopy to investigate dendritic spine formation and elimination in barrel cortex of mice under physical constrain or naive conditions, followed by memory performance in a whisker-dependent novel texture discrimination task...
March 21, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28323239/biomechanical-analysis-of-lateral-interbody-fusion-strategies-for-adjacent-segment-degeneration-in-the-lumbar-spine
#15
Melodie F Metzger, Samuel T Robinson, Ruben C Maldonado, Jeremy Rawlinson, John Liu, Frank L Acosta
BACKGROUND CONTEXT: Surgical treatment of symptomatic adjacent segment disease (ASD) typically involves extension of previous instrumentation to include the newly-affected level(s). Disruption of the incision-site can present challenges and increases the risk of complication. Lateral-based interbody fusion techniques may provide a viable surgical alternative that avoids these risks. This study is the first to analyze the biomechanical effect of adding a lateral-based construct to an existing fusion...
March 17, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28323183/calcified-spinal-meningiomas
#16
Andrea Gennaro Ruggeri, Benedetta Fazzolari, Davide Colistra, Martina Cappelletti, Nicola Marotta, Roberto Delfini
OBJECTIVE: This study has been undertaken to analyse outcome of patients surgically treated for calcified spinal meningiomas and to determine factors associated with surgical morbidity. METHODS: Between January 2000 and June 2013 a total of 54 patients underwent surgical resection of a spinal meningioma: 37 of these cases have shown various degrees of calcification, confirmed by histopathological analysis. The clinical evaluation have been performed according to the ASIA Impairment Scale...
March 18, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28321993/metatropic-dysplasia-a-skeletal-dysplasia-with-challenging-airway-and-other-anesthetic-concerns
#17
Mary C Theroux, Martha Lopez, Patricia J Olszewsky, Sabina DiCindio, Lynda Arai, Colleen Ditro, Michael B Bober, Olubukola Opeyemi Olla, Tetsu Uejima, David W West, William G Mackenzie
BACKGROUND: Metatropic dysplasia is a rare form of skeletal dysplasia requiring multiple anesthetics for surgical and imaging procedures, most of which are orthopedic procedures. We provide centralized care to patients with skeletal dysplasia at our tertiary care pediatric hospital, and we were able to collect the largest number of metatropic dysplasia patients reported to date. AIM: The aim of this retrospective study was to describe and characterize the anesthetic difficulties in this high-risk population...
March 21, 2017: Paediatric Anaesthesia
https://www.readbyqxmd.com/read/28321371/anatomic-variations-in-pituitary-endocrinopathies-implications-for-the-surgical-corridor
#18
Edward C Kuan, Frederick Yoo, Won Kim, Karam W Badran, Thomas E Heineman, Ali R Sepahdari, Marvin Bergsneider, Marilene B Wang
Objectives/Hypotheses Functioning pituitary adenomas may produce endocrinopathies such as acromegaly and Cushing syndrome. Both conditions lead to characteristic anatomic variations as a result of hormonally induced abnormal soft tissue deposition. We evaluate the anatomic differences between acromegalics and Cushing disease patients and compare these dimensions to controls. Design Radiographic review of preoperative magnetic resonance images (MRI) of the pituitary gland. Setting Tertiary academic medical center...
April 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28319550/continuous-transversus-abdominis-plane-nerve-blocks-does-varying-local-anesthetic-delivery-method-automatic-repeated-bolus-versus-continuous-basal-infusion-influence-the-extent-of-sensation-to-cold-a-randomized-triple-masked-crossover-study-in-volunteers
#19
Bahareh Khatibi, Engy T Said, Jacklynn F Sztain, Amanda M Monahan, Rodney A Gabriel, Timothy J Furnish, Johnathan T Tran, Michael C Donohue, Brian M Ilfeld
BACKGROUND: It remains unknown whether continuous or scheduled intermittent bolus local anesthetic administration is preferable for transversus abdominis plane (TAP) catheters. We therefore tested the hypothesis that when using TAP catheters, providing local anesthetic in repeated bolus doses increases the cephalad-caudad cutaneous effects compared with a basal-only infusion. METHODS: Bilateral TAP catheters (posterior approach) were inserted in 24 healthy volunteers followed by ropivacaine 2 mg/mL administration for a total of 6 hours...
April 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28318784/kinetics-of-endogenous-camkii-required-for-synaptic-plasticity-revealed-by-optogenetic-kinase-inhibitor
#20
Hideji Murakoshi, Myung Eun Shin, Paula Parra-Bueno, Erzsebet M Szatmari, Akihiro C E Shibata, Ryohei Yasuda
Elucidating temporal windows of signaling activity required for synaptic and behavioral plasticity is crucial for understanding molecular mechanisms underlying these phenomena. Here, we developed photoactivatable autocamtide inhibitory peptide 2 (paAIP2), a genetically encoded, light-inducible inhibitor of CaMKII activity. The photoactivation of paAIP2 in neurons for 1-2 min during the induction of LTP and structural LTP (sLTP) of dendritic spines inhibited these forms of plasticity in hippocampal slices of rodents...
March 8, 2017: Neuron
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