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https://www.readbyqxmd.com/read/29322984/a-device-for-three-dimensional-quantitative-assessment-and-alignment-of-c1-2-vertebrae-during-posterior-distraction-and-fusion-technique-for-atlantoaxial-dislocation-and-or-basilar-invagination
#1
P B Karthik, Jayesh Sardhara, Nachiketa Tiwari, Sanjay Behari
The most common type of congenital C1-2 dislocation is a combined type in which atlanto-axial dislocation (AAD) and basilar invagination (BI) are often associated with a rotational dislocation and coronal tilt. An optimal surgical treatment involves reduction of AAD and BI with simultaneous correction of the rotation and coronal tilt to achieve an optimal cervical canal decompression, sagittal and coronal realignment and bony fusion. The most acceptable technique to facilitate this correction is the C1-C2 distraction technique, which is accomplished by the manual joint manipulation...
January 2018: Neurology India
https://www.readbyqxmd.com/read/29318090/c1-2-fixation-approach-for-patients-with-vascular-irregularities-a-case-report
#2
Alireza K Nazemi, Stetson R Bickley, Caleb J Behrend, Jonathan J Carmouche
In posterior spinal fusion (PSF), the vertebral artery is most vulnerable to injury at C1-2. C2 pedicle screws are often placed into the dorsomedial isthmus of C2. Alternative techniques include C2 laminar screws and wiring techniques. A 67-year-old male underwent PSF for persistent severe intractable neck pain and degeneration at C1-2. The patient had an enlarged left vertebral artery with midline migration into the C2 body. This pattern was within one standard deviation of normal; however, it rendered typical placement of a C2 pedicle screw unsafe...
December 2017: Geriatric Orthopaedic Surgery & Rehabilitation
https://www.readbyqxmd.com/read/29310670/the-comparison-of-clinical-outcome-of-fresh-type-ii-odontoid-fracture-treatment-between-anterior-cannulated-screws-fixation-and-posterior-instrumentation-of-c1-2-without-fusion-a-retrospective-cohort-study
#3
Suomao Yuan, Bin Wei, Yonghao Tian, Jun Yan, Wanlong Xu, Lianlei Wang, Xinyu Liu
BACKGROUND: Recently, the excellent outcomes of temporary fixation of C1-2 without fusion in the treatment of odontoid fracture had been reported. It is still unclear if this technique could achieve the equivalent outcomes as the golden standard technique of anterior screw fixation. The objective of this study is to compare the clinical outcome of two treatments of fresh type II odontoid fracture: anterior cannulated screws fixation (ACSF) versus posterior instrumentation of C1-2 without fusion (PIWF)...
January 8, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29310380/traumatic-c1-2-posterolateral-dislocation-with-dens-fracture-injury-of-the-transverse-atlantal-ligament-and-unilateral-facet-fracture-with-subluxation-of-c6-7-a-case-report
#4
Jong-Beom Park, Sung Shik Kang, Jin S Yeom
RATIONALE: Traumatic C1-2 dislocation associated with contiguous or noncontiguous cervical spine injury is rare. Moreover, there have been no reports describing traumatic C1-2 dislocation associated with multiple contiguous and noncontiguous cervical injuries. PATIENT CONCERNS: The authors present a case of a 20-year-old male with painful limitation of motion of the neck. This complex cervical injury occurred due to hyperextension of the head in a rotated position...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29301174/comparison-of-cervical-alignment-and-clinical-outcomes-in-patients-with-os-odontoideum-versus-non-os-odontoideum-after-atlantoaxial-fixation
#5
Farid Yudoyono, Jiin Kang, Yoon Ha
OBJECTIVE: The purpose of this study was to compare the effect of atlantoaxial fixation on cervical alignment and clinical outcomes in patients with os odontoideum (OO) versus non-os odontoideum (non-OO). METHODS: A total of 119 patients who underwent atlantoaxial fixation for instability were identified between January 1998 and January 2014. Inclusion criteria included age more than 21 years and diagnosis of OO and non-OO. There were 22 OO patients, and 20 non-OO patients...
December 2017: Korean Journal of Spine
https://www.readbyqxmd.com/read/29297555/the-in-situ-effect-of-titanium-tetrafluoride-gel-on-erosion-abrasion-progression-in-human-dentin
#6
Taís Fonseca Mantilla, Cecilia Pedroso Turssi, Thayanne Monteiro Ramos-Oliveira, Camila Vieira da Silva, Luis Cláudio Suzuki, Patricia Moreira de Freitas
Erosion incidence is increasing and its control is still a challenge in clinical practice. This study evaluated 4% TiF4-gel effects on eroded human dentin subjected to in situ erosive/abrasive episodes. Seventy-two previously eroded dentin slabs (0.05 M citric acid, pH 2.3, 20 min) were allocated to 6 groups (n=12) according to the treatment to be performed during the in situ phase and number of erosive/abrasive cycles, as follows: 4% TiF4-gel applied once (TiF41), twice (TiF42) or three times (TiF43) followed by 1, 2 and 3 erosive/abrasive cycles, respectively...
May 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29289915/-congenital-anomalies-of-craniovertebral-junction-presenting-after-50-years-of-age-an-oxymoron-or-an-unusual-variation
#7
Pravin Salunke, Madhivanan Karthigeyan, Narasimhaiah Sunil, Vasundhara Rangan
OBJECTIVES: Manifestation of congenital anomalies of cranio-vertebral junction (CVJ) in the later half of life is unusual and intriguing. Coexisting cervical spondylotic changes with multilevel compression, poorer bone quality as well as less smooth post-surgical recuperation make management of elderly Congenital Atlantoaxial Dislocation/ Basilar Invagination (CAAD/BI) challenging. The clinico-radiological presentation, pathogenesis and outcome are analysed here. PATIENTS AND METHODS: Clinico-radiological data of 20 patients of CAAD/BI (with markers of congenital anomalies) presenting after 50 years of age, the challenges faced and outcomes after C1-C2 fusion have been analysed...
December 21, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/29288330/evaluation-of-vertebral-artery-anomaly-in-basilar-invagination-and-prevention-of-vascular-injury-during-surgical-intervention-cta-features-and-analysis
#8
Shuaishuai Xu, Shidong Ruan, Xiaoyu Song, Jinyu Yu, Jianrong Xu, Ruozhen Gong
OBJECTIVE: To evaluate vertebral artery anomaly at the craniovertebral junction (CVJ) in patients with basilar invagination (BI) by computed tomographic angiography (CTA), and to discuss the prevention strategy of vascular injury. METHODS: The primary axial, multiple planar reconstruction and volume-rendering cervicocranial CTA images of 39 BI patients were analysed to evaluate vertebral artery anomaly at the CVJ: persistent first intersegmental artery (PFIA), fenestrated vertebral artery (FEN), and extracranial C1/2 origin of posterior inferior cerebellar artery (PICA), high-riding vertebral artery, side-to-side asymmetry and irregular midline carotid artery loop was determined by subjective vision...
December 29, 2017: European Spine Journal
https://www.readbyqxmd.com/read/29279983/surgical-anatomy-of-neurovascular-structures-related-to-ventral-c1-2-complex-an-anatomical-study
#9
Sibel Cirpan, Salih Sayhan, Goksin Nilufer Yonguc, Canan Eyuboglu, Mustafa Güvençer, Sait Naderi
OBJECTIVE: Transoral odontoidectomy and ventral C1-2 stabilization are important surgical procedures, performed to decompress ventral spinal cord, and to stabilize craniovertebral junction. These procedures require knowledge regarding surgical anatomy of neurovascular structures ventral to the C1-2 complex. The aim of this study is to evaluate the relationships between neurovascular structures and bony landmarks in ventral atlantoaxial complex. MATERIALS AND METHODS: This study was performed on six formaldehyde fixed cadaveric head and neck specimens...
December 26, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/29197675/homozygous-hla-c1-is-associated-with-reduced-risk-of-relapse-after-hla-matched-transplantation-in-patients-with-myeloid-leukemia
#10
Nobuyoshi Arima, Junya Kanda, Junji Tanaka, Toshio Yabe, Yasuo Morishima, Sung-Won Kim, Yuho Najima, Yukiyasu Ozawa, Tetsuya Eto, Heiwa Kanamori, Takehiko Mori, Naoki Kobayashi, Tadakazu Kondo, Hirohisa Nakamae, Naoyuki Uchida, Masami Inoue, Takahiro Fukuda, Tatsuo Ichinohe, Yoshiko Atsuta, Yoshinobu Kanda
Natural killer (NK) cells assume graft-versus-leukemia alloreactivity after hematopoietic stem cell transplantation (HSCT) through their inhibitory killer cell immunoglobulin-like receptors (KIRs). KIR2D family members recognize HLA-C alleles with Asn80 (HLA-C1) or Lys80 (HLA-C2). The predominance of HLA-C1 over HLA-C2 and the frequent presence of KIR2DL1 are characteristic of Japanese people. We compared clinical outcomes among homozygous HLA-C1 (HLA-C1/C1) patients and heterozygous HLA-C1/C2 patients who underwent HLA-matched HSCT for hematologic malignancies by assessing the data of 10,638 patients from the Japanese national registry...
December 27, 2017: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/29192878/motion-preserving-2-stage-transoral-and-posterior-treatment-of-an-unstable-jefferson-fracture-in-a-professional-football-player
#11
Gerald E Rodts, Griffin R Baum, Fermin G Stewart, John G Heller
The authors report the case of a patient who suffered a Jefferson fracture during a professional football game. The C-1 (atlas) fracture was widely displaced anteriorly, but the transverse ligament was intact. In an effort to enable a return to play and avoid intersegmental (C1-2) fusion, the patient underwent a transoral approach for open reduction and internal fixation of the fracture. The associated posterior ring fracture displacement widened after this procedure, and a subsequent posterior arthrodesis and fixation of the fracture site was performed 6 months later when the fracture failed to heal with rigid collar immobilization...
December 1, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29185209/value-of-the-oxford-classification-of-iga-nephropathy-in-children-with-henoch-sch%C3%A3-nlein-purpura-nephritis
#12
Ke Xu, Lili Zhang, Jie Ding, Suxia Wang, Baige Su, Huijie Xiao, Fang Wang, Xuhui Zhong, Yanming Li
BACKGROUND: The widely used International Study of Kidney Disease in Children (ISKDC) classification for Henoch-Schönlein purpura nephritis (HSPN) does not completely correlate with the clinical presentation and long-term prognosis of this disease. Primary IgA nephropathy (IgAN) and HSPN share common features; thus, the Oxford classification of IgAN might be useful in predicting the long-term outcomes of HSPN. However, its value has not been confirmed in children with HSPN. METHODS: We selected children with HSPN diagnosed between 2003 and 2015, and reclassified their renal biopsies according to the Oxford classification scoring system...
November 28, 2017: Journal of Nephrology
https://www.readbyqxmd.com/read/29184713/posterior-atlantoaxial-fusion-using-a-c2-transverse-foramen-penetrating-screw-a-technical-note
#13
Yasuhiro Takeshima, Hideki Shigematsu, Kengo Konishi, Ichiro Nakagawa, Yasushi Motoyama, Hiroyuki Nakase
Background: Although recent development of screw instrumentation techniques for rigid fixation of the atlantoaxial joint has increased surgical options, patients in whom screws of any type cannot be safely placed are sometimes encountered. We present a unique surgical technique for C1-2 transarticular screw placement utilizing a novel trajectory. Methods: A 35-year-old male with a history of Down's syndrome and cognitive dysfunction with hyperkinesis spontaneously developed rapid onset of tetraparesis and gait disturbance...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/29174476/brown-sequard-syndrome-caused-by-hyperextension-in-a-patient-with-atlantoaxial-subluxation-due-to-an-os-odontoideum
#14
Dong-Yeong Lee, Soon-Taek Jeong, Tae-Ho Lee, Dong-Hee Kim
Brown-Sequard syndrome is an uncommon complication of atlantoaxial arthrodesis. A 50-year-old female visited our emergency department after falling from a ladder. Radiologic evaluations revealed chronic C1-2 instability with acute spinal cord injury. The day after atlantoaxial fusion was performed, she developed left-sided motor weakness and the loss of right-sided pain and temperature sensation. Based on physical examination and radiologic findings, we diagnosed her as having Brown-Sequard syndrome. Spine surgeons performing this procedure should therefore consider Brown-Sequard syndrome if a patient displays signs of postoperative hemiplegia...
November 23, 2017: Acta Orthopaedica et Traumatologica Turcica
https://www.readbyqxmd.com/read/29101046/structural-and-functional-insights-into-thermostable-and-organic-solvent-stable-variant-pro247-ser-of-bacillus-lipase
#15
Nisha Chopra, Arbind Kumar, Jagdeep Kaur
Thermostability of enzymes is an important issue in protein engineering and has been studied in detail. Still there is no hard and fast rule to define the conditions which will provide thermal stability. Understanding the various factors and mechanism responsible for thermal stability will add on new insights into our present knowledge in this area. Pro247-Ser variant was constructed based on homology modelling and rational design. It exhibited 60 fold increase in thermal stability at 60°C and+0.7M shift in C1/2 value for urea denaturation as compared to WT...
October 31, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29090212/metabolism-of-citrate-and-other-carboxylic-acids-in-erythrocytes-as-a-function-of-oxygen-saturation-and-refrigerated-storage
#16
Travis Nemkov, Kaiqi Sun, Julie A Reisz, Tatsuro Yoshida, Andrew Dunham, Edward Y Wen, Alexander Q Wen, Rob C Roach, Kirk C Hansen, Yang Xia, Angelo D'Alessandro
State-of-the-art proteomics technologies have recently helped to elucidate the unanticipated complexity of red blood cell metabolism. One recent example is citrate metabolism, which is catalyzed by cytosolic isoforms of Krebs cycle enzymes that are present and active in mature erythrocytes and was determined using quantitative metabolic flux analysis. In previous studies, we reported significant increases in glycolytic fluxes in red blood cells exposed to hypoxia in vitro or in vivo, an observation relevant to transfusion medicine owing to the potential benefits associated with hypoxic storage of packed red blood cells...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29075136/outcomes-of-c1-2-joint-injections
#17
Christopher M Aiudi, W Michael Hooten, Rebecca A Sanders, James C Watson, Susan M Moeschler, Halena M Gazelka, Bryan C Hoelzer, Jason S Eldrige, Wenchun Qu, Tim J Lamer
OBJECTIVE: Intra-articular injections of the C1-2 joint are an effective therapeutic option for pain generated from degenerative and inflammatory conditions affecting the joint. Limited information exists about the adverse events (AEs) associated with these injections. The primary aim of this study is to describe the frequency and type of AEs associated with C1-2 joint injections. The secondary aim is to identify clinical factors associated with the occurrence of AEs of C1-2 joint injections...
2017: Journal of Pain Research
https://www.readbyqxmd.com/read/29018650/surgical-treatment-of-rotational-vertebral-artery-syndrome-induced-by-spinal-tumor-a-case-report-and-literature-review
#18
Shoichi Haimoto, Yusuke Nishimura, Masahito Hara, Yuu Yamamoto, Toshiki Fukuoka, Ryuichi Fukuyama, Toshihiko Wakabayashi, Howard J Ginsberg
Vertebrobasilar insufficiency (VBI) provoked by physiological head rotation is known as rotational vertebral artery syndrome (RVAS) or Bow Hunter syndrome. RVAS most often occurs at C1-2 level with head rotation and presents with symptoms of VBI. Several previously published studies have reported RVAS at subaxial sites (V2 segment), however, tumor-induced RVAS has never been reported. The authors report the first case of RVAS at V2 segment due to compression from a spinal tumor. A 71-year-old man presented with symptoms of dizziness provoked by head rotation or neck extension...
October 2017: NMC Case Report Journal
https://www.readbyqxmd.com/read/28962628/percutaneous-anterior-c1-2-transarticular-screw-fixation-salvage-of-failed-percutaneous-odontoid-screw-fixation-for-odontoid-fracture
#19
Ai-Min Wu, Hai-Ming Jin, Zhong-Ke Lin, Yong-Long Chi, Xiang-Yang Wang
BACKGROUND: The objective of this study is to investigate the outcomes and safety of using percutaneous anterior C1/2 transarticular screw fixation as a salvage technique for odontoid fracture if percutaneous odontoid screw fixation fails. METHODS: Fifteen in 108 odontoid fracture patients (planned to be treated by percutaneous anterior odontoid screw fixation) were failed to introduce satisfactory odontoid screw trajectory. To salvage this problem, we chose the percutaneous anterior C1/2 transarticular screw fixation technique in treatment of these patients...
September 29, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28942742/atlanto-axial-rotatory-fixation-a-serious-potential-complication-of-paediatric-ent-surgery-that-requires-prompt-diagnosis-and-treatment
#20
G James, D N P Thompson
BACKGROUND: Atlanto-axial rotatory fixation is a persistent deformity of the C1-2 vertebral relationship caused by subluxation of the articular surfaces, and can occur after positioning for ENT procedures where the head is rotated - for example to access the ear or posterior triangle of the neck. If promptly recognised, it can usually be managed successfully with conservative methods, without long-lasting sequelae, but delayed or inappropriate management may lead to permanent neck deformity, neurological problems and pain...
September 25, 2017: Journal of Laryngology and Otology
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