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https://www.readbyqxmd.com/read/28525479/outcome-of-bilateral-c1-laminar-hooks-combined-with-c2-pedicle-screw-fixation-for-the-treatment-of-c1-c2-instability-a-report-of-18-cases-from-a-single-chinese-center
#1
Lifeng Lao, Guibin Zhong, Qianyi Li, Xinfeng Li, Bin Chen, Lie Qian, Zude Liu
STUDY DESIGN: A retrospective technical report. OBJECTIVE: To assess the effect of bilateral C1 laminar hooks combined with C2 pedicle screw fixation for the treatment of C1-C2 instability. SUMMARY OF BACKGROUND DATA: Various posterior atlantoaxial fixations for C1-C2 instability have been developed. However, due to anatomic anomalies of the vertebral artery, the smallness of the pedicle, trajectories of broken screws, or a lack of surgical experience, a simple atlantoaxial fixation technique with good safety and effectiveness is urgently needed...
June 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28524792/analysis-and-interrater-reliability-of-pb-c2-using-mri-and-ct-data-from-the-park-reeves-syringomyelia-research-consortium-on-behalf-of-the-pediatric-craniocervical-society
#2
Todd C Hankinson, Gerald F Tuite, Dagmara I Moscoso, Leslie C Robinson, James C Torner, David D Limbrick, Tae Sung Park, Richard C E Anderson
OBJECTIVE The distance to the ventral dura, perpendicular to the basion to C2 line (pB-C2), is commonly employed as a measure describing the anatomy of the craniovertebral junction. However, both the reliability among observers and the clinical utility of this measurement in the context of Chiari malformation Type I (CM-I) have been incompletely determined. METHODS Data were reviewed from the first 600 patients enrolled in the Park-Reeves Syringomyelia Research Consortium with CM-I and syringomyelia. Thirty-one cases were identified in which both CT and MRI studies were available for review...
May 19, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28522382/brain-abscess-following-halo-fixation-for-the-cervical-spine
#3
Arthur Lopes, Almir Andrade, Igor Silva, Wellingson Paiva, Roger Brock, Manoel Teixeira
BACKGROUND: Halo fixation is one of the possible treatments for cervical spine fractures. However, improper use of these devices may lead to many complications, such as pin loosening, halo dislocation, pin site infection, and intradural penetration. CASE DESCRIPTION: We report a 43-year-old man who first presented with a seizure and an altered level of consciousness five months after halo-vest placement for an odontoid fracture. Brain imaging revealed a brain abscess, under the previous left parietal pin...
May 15, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28512042/the-corona-dentis-description-of-an-anatomical-variant-with-technical-implications-for-anterior-odontoid-screw-placement
#4
Fernando Alonso, Joe Iwanaga, Jens R Chapman, Rod J Oskouian, R Shane Tubbs
INTRODUCTION: Type 2 odontoid fractures are the most common cervical fractures among the elderly. Neurological deficit is usually caused as a result of myelopathy due to posterior dens migration. Direct anterior screw placement provides stabilization and can preserve C1-C2 movement. The presence of a bony excrescence on the anterior superior tip of the dens may lead to placement of a screw of incorrect length. METHODS: Twenty C2 dry specimens were examined for the presence of a corona dentis, which is a bony excrescence in the coronal plane near the apex of the dens...
May 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28498058/endoscopic-endonasal-resection-of-the-odontoid-process-clinical-outcomes-in-34-adults
#5
Nathan T Zwagerman, Matthew J Tormenti, Zachary J Tempel, Eric W Wang, Carl H Snyderman, Juan C Fernandez-Miranda, Paul A Gardner
OBJECTIVE Treatment of odontoid disease from a ventral corridor has consisted of a transoral approach. More recently, the endoscopic endonasal approach (EEA) has been used to access odontoid pathology. METHODS A retrospective review was conducted of patients who underwent an EEA for odontoid pathology from 2004 to 2013. During our analysis, the mean follow-up duration was 42.6 months (range 1-80 months). Patient outcomes, complications, and postoperative swallowing function were assessed either by clinic visit or phone contact...
May 12, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28459776/postoperative-regression-of-retro-odontoid-pseudotumor-after-atlantoaxial-posterior-fixation-11-years-of-experience-in-patients-with-atlantoaxial-instability
#6
Jung Hyun Park, Eugene Lee, Joon Woo Lee, Yusuhn Kang, Joong Mo Ahn, Jin S Yeom, Heung Sik Kang
STUDY DESIGN: Case series study. OBJECTIVE: The aim was to investigate the incidence of retro-odontoid pseudotumor in patients with atlantoaxial instability (AAI) and evaluate pseudotumor regression after posterior fixation. SUMMARY OF BACKGROUND DATA: The incidence of retro-odontoid pseudotumor in atlantoaxial instability patients remains uncertain. Moreover, the regression of retro-odontoid pseudotumor after posterior fixation in patients with various underlying diseases needs to be further investigated...
April 28, 2017: Spine
https://www.readbyqxmd.com/read/28457924/surgical-intervention-for-unstable-craniovertebral-junction-anomalies-with-a-narrow-c2-pedicle
#7
Rami Darwazeh, Qiang Liu, Lei Deng, Jiajie Xia, Mohammed A Elzain, Mazhar Darwazeh, Piyush Sharma, Bo Zhang, Yi Yan
OBJECTIVE: To investigate and report a novel surgical technique of screws insertion and posterior surgical reduction as well as explore its clinical results. METHODS: From September 2008 to September 2012, 41 cases of unstable craniovertebral junction anomalies with a narrow C2 pedicle were treated at our department. All patients underwent "posterior reduction and internal fixation of the occipital bone with superior or inferior articular process of C2 and lateral mass of C3 on the narrowed C2 pedicle side -for non-narrowed C2 pedicle side, the screw was only inserted into C2 pedicle without extending the fixation to C3 vertebrae- using a titanium screw-rod (plate) fixation system"...
April 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28440697/the-prevalence-of-calcification-around-odontoid-process-and-the-incidence-of-crowned-dens-syndrome-in-the-neurosurgical-ward-a-single-institution-s-analysis
#8
Masakazu Sano, Shinya Yamashita, Toyotaka Aiba
OBJECTIVE: The objective of this study is to assess the prevalence and natural history of odontoid calcification and to identify factors related to its progression to crowned dens syndrome (CDS). METHODS: We reviewed a consecutive series of patients who underwent head CT upon admission to the neurosurgical ward of Niigata Prefectural Shibata Hospital. We evaluated the relationship between the presence of odontoid calcification and the patient's age, sex, and primary disorder for admission...
April 25, 2017: Modern Rheumatology
https://www.readbyqxmd.com/read/28422889/an-in-vitro-biomechanical-evaluation-of-an-expansive-double-threaded-bi-directional-compression-screw-for-fixation-of-type-ii-odontoid-process-fractures-a-squire-compliant-article
#9
Ning Liu, Li Tian, Rong-Xian Jiang, Chao Xu, Lei Shi, Wei Lei, Yang Zhang
Odontoid process fracture accounts for 5% to 15% of all cervical spine injuries, and the rate is higher among elderly people. The anterior cannulated screw fixation has been widely used in odontoid process fracture, but the fixation strength may still be limited under some circumstances. This study aims to investigate the biomechanical fixation strength of expansive double-threaded bi-directional compression screw (EDBCS) compared with cannulated lag screw (CLS) and improved Herbert screw (IHS) for fixation of type II odontoid process fracture...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28419881/the-effects-of-clinical-factors-and-retro-odontoid-soft-tissue-thickness-on-atlantoaxial-instability-in-patients-with-rheumatoid-arthritis
#10
Je Il Ryu, Myung Hoon Han, Jin Hwan Cheong, Jae Min Kim, Choong Hyun Kim, Hyoung Joon Chun, Koang Hum Bak
No abstract text is available yet for this article.
April 15, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28409288/temporary-fusionless-posterior-occipitocervical-fixation-for-a-proximal-junctional-type-ii-odontoid-fracture-after-previous-c2-pelvis-fusion-case-report-description-of-a-new-surgical-technique-and-review-of-the-literature
#11
Alexander A Theologis, Vedat Deviren, Bobby Tay
PURPOSE: Axial fractures in patients with a previous C2-pelvis posterior instrumented fusion are rare and may be challenging to manage. Motion preservation in the axial spine for these patients is important, as the C1-2 and Occipit-C1 joints are their only remaining mobile spinal segments. In this unique report, we present for the first time the use of a fusionless occipitocervical operation for the treatment of a type II odontoid fracture and unilateral C2 pars fracture adjacent to a previous C2-pelvis posterior instrumented fusion...
April 13, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28403693/anterior-retropharyngeal-plate-screw-fixation-with-bilateral-anterior-transarticular-screws-for-odontoid-fractures-a-new-comprehensive-technique
#12
Sushil Patkar
INTRODUCTION: A certain group of odontoid fractures (Anderson and D' Alonzo Type-2) are usually offered surgical treatment. Common surgical option is an anterior odontoid screw. Some of the fractures are not suitable for anterior odontoid screw (anterior oblique, displaced distal fragments and those with atlantoaxial instability) and these are usually offered posterior transarticular screws (Magerl's) or posterior atlantoaxial screw rod/plate fixation (Goel-Harms technique). Posterior surgery involves atlantoaxial fixation with an indirect attempt to reduce and fuse the fracture ...
April 13, 2017: Neurological Research
https://www.readbyqxmd.com/read/28399555/management-of-unusual-atlantoaxial-dislocation
#13
Ruipeng Song, Daoyang Fan, Han Wu, Zhen Zhang, Liang Zhao, Yilin Liu, Wensheng Liao, Hongyu Tan, Limin Wang, Weidong Wang
STUDY DESIGN: A case report and review of the literature. OBJECTIVE: The aim of this study was to describe the successful treatment of one posterior atlantoaxial dislocation without fracture and to review the relevant literature. SUMMARY OF BACKGROUND DATA: Posterior atlantoaxial dislocation without fracture of the odontoid process is extremely rare. Management of these patients is still unknown. METHODS: A posterior atlantoaxial dislocation without fracture in a 58-year-old man with incomplete quadriplegia was treated surgically with posterior atlantoaxial pedicle screws internal fixation and fusion after closed reduction...
April 15, 2017: Spine
https://www.readbyqxmd.com/read/28387614/reduction-of-atlantoaxial-dislocation-prevented-by-pathological-position-of-the-transverse-ligament-in-fixed-irreducible-os-odontoideum-operative-illustrations-and-radiographic-correlates-in-41-patients
#14
Brian J Dlouhy, Bruno A Policeni, Arnold H Menezes
OBJECTIVE Os odontoideum (OO) is a craniovertebral junction (CVJ) abnormality in which an ossicle (small bone) is cranial to a hypoplastic dens by a variable gap. This abnormality can result in instability, which may be reducible or irreducible. What leads to irreducibility in OO is unclear. Therefore, the authors sought to better understand the causes of irreducibility in OO. METHODS A retrospective review was conducted, which identified more than 200 patients who had undergone surgical treatment for OO between 1978 and 2015 at the University of Iowa Hospitals and Clinics...
April 7, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28361020/role-of-dynamic-computed-tomography-scans-in-patients-with-congenital-craniovertebral-junction-malformations
#15
Otávio Turolo da Silva, Enrico Ghizoni, Helder Tedeschi, Andrei Fernandes Joaquim
AIM: To evaluate the role of dynamic computed tomography (CT) scan imaging in diagnosing craniovertebral junction (CVJ) instability in patients with congenital CVJ malformations. METHODS: Patients with symptomatic congenital CVJ malformations who underwent posterior fossa decompression and had a preoperative dynamic CT scan in flexion and extended position were included in this study. Measurements of the following craniometrical parameters were taken in flexed and extended neck position: Atlanto-dental interval (ADI), distance of the odontoid tip to the Chamberlain's line, and the clivus-canal angle (CCA)...
March 18, 2017: World Journal of Orthopedics
https://www.readbyqxmd.com/read/28345069/an-uncommon-case-mimicking-cervical-trauma-os-odontoideum
#16
Idiris Altun, Kasim Zafer Yuksel
Os odontoideum is a separate odontoid process from the body of the axis. It is the most common anomaly of the odontoid process. Patients with this condition can be asymptomatic or present with a wide range of neurological dysfunctions. It may cause cervical instability, atlantoaxial dislocation and myelopathy. This anomaly can mimic Type I and II odontoid fractures. There is a role for conservative treatment of an asymptomatic incidentally found, radiologically stable and non-compressive os odontoideum. However, surgical treatment has a definitive role in symptomatic cases...
March 2017: Turkish Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28344179/first-gross-anatomic-findings-of-an-os-odontoideum
#17
Juan P Sardi, Joe Iwanaga, Rod J Oskouian, R Shane Tubbs
BACKGROUND: Os odontoideum is an uncommon abnormality of the craniovertebral junction where the tip of the odontoid process lacks continuity with the body of C2. The clinical presentation is variable, but severe neurologic impairment can result. CASE DESCRIPTION: We report the gross and radiologic findings of a cadaver found to harbor an os odontoideum. CONCLUSIONS: To our knowledge, there are no cadaveric reports in the literature regarding an os odontoideum...
May 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28338574/rigid-occipitocervical-instrumented-fusion-for-atlantoaxial-instability-in-an-18-month-old-toddler-with-brachytelephalangic-chondrodysplasia-punctata-a-case-report
#18
Hiroki Oba, Jun Takahashi, Kyoko Takano, Yuji Inaba, Mitsuo Motobayashi, Gen Nishimura, Shugo Kuraishi, Masayuki Shimizu, Shota Ikegami, Toshimasa Futatsugi, Masashi Uehara, Tomoki Kosho, Hiroyuki Kato, Koki Uno
STUDY DESIGN: Case report OBJECTIVE.: We report here on an 18-month-old boy with brachytelephalangic chondrodysplasia punctata (BCDP), whose atlantoaxial instability was successfully managed with occipitocervical instrumented fusion (OCF) using screw and rod instrumentations. SUMMARY OF BACKGROUND DATA: Recently, there have been a number of reports on BCDP with early onset of cervical myelopathy. Surgical OCF is a vital intervention to salvage affected individuals from the life-threatening morbidity...
March 23, 2017: Spine
https://www.readbyqxmd.com/read/28279770/transoral-decompression-and-anterior-stabilization-of-atlantoaxial-joint-in-patients-with-basilar-impression-and-chiari-malformation-type-i-a-technical-report-2-clinical-cases
#19
Alexey Nikolaevich Shkarubo, Alexander Alekseevich Kuleshov, Ilia Valerievich Chernov, Marchel Stepanovich Vetrile
OBJECT: presentation of clinical cases involving successful anterior stabilization of the C1-C2 segment in patients with invaginated C2 odontoid process and Chiari malformation type I. STUDY DESIGN: clinical case description. RESULTS: two patients with C2 odontoid processes invagination and Chiari malformation type I were surgically treated using the transoral approach. In both cases, anterior decompression of the upper cervical region was performed, followed by anterior stabilization of the C1-C2 segment...
March 6, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28264274/a-new-species-of-i-phyllodytes-i-wagler-1830-anura-hylidae-from-the-atlantic-forest-of-southern-bahia-brazil
#20
Euvaldo Marciano-Jr, Amanda Santiago F Lantyer-Silva, Mirco Solé
We describe a new species of Phyllodytes from Ilhéus (15º04'S, 39º03'W; 95 m above sea level), south of state of Bahia, in the northeastern Atlantic Forest of Brazil. Phyllodytes megatympanum sp. nov. is diagnosable by the following combination of characters: (1) dorsum of body, arms, and legs uniformly light brown; (2) groin yellow; (3) snout pointed in dorsal view, protruding in profile; (4) tympanum large with a round distinct tympanic annulus; (5) adult males with two anterior large odontoids followed by a series of smaller odontoids on each side of the mandible; (6) well-developed tubercle near tibio-tarsal joint; (7) advertisement call composed of a series of 12 to 19 unpulsed notes, with harmonic structure and (8) mean dominant frequency of 3...
March 2, 2017: Zootaxa
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