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Occiput posterior

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https://www.readbyqxmd.com/read/28278181/the-myodural-bridge-existing-in-the-nephocaena-phocaenoides
#1
Pei Liu, Chan Li, Nan Zheng, Qiang Xu, Sheng-Bo Yu, Hong-Jin Sui
Recent studies have identified that the myodural bridge (MDB) between the rectus capitis posterior minor (RCPmi) and the cervical spinal dura mater in the posterior atlanto-occipital interspace in humans. And it was supposed that the MDB may play essential physiological roles. As a result, the MDB is possibly a highly conserved structure in the evolution of mammals. However, there is little confirmative description about the existence of the MDB in marine mammals. The objective of this study was to explore the existence and the fiber property of the MDB in the Neophocaena phocaenoides...
2017: PloS One
https://www.readbyqxmd.com/read/28250638/odontoidectomy-through-posterior-midline-approach-followed-by-same-sitting-occipitocervical-fixation-a-cadaveric-study
#2
Ehab Mohamed Eissa, Mohamed Mohi Eldin
OBJECT: Atlantoaxial instability with irreducible odontoid process is one of the challenges in spine surgery. These lesions are commonly treated through anterior transoral approach which is followed by posterior atlantoaxial fusion. However, there are still many limitations, especially cerebrospinal fluid fistula with subsequent life-threatening infection, difficulty in cases with limited opening of mouth due to temporomandibular arthritis or anomalies of naso-oropharynx. Türe et al...
January 2017: Journal of Craniovertebral Junction and Spine
https://www.readbyqxmd.com/read/28222704/duration-of-second-stage-of-labor-and-instrumental-delivery-as-risk-factors-for-severe-perineal-lacerations-population-based-study
#3
Marija Simic, Sven Cnattingius, Gunnar Petersson, Anna Sandström, Olof Stephansson
BACKGROUND: We sought to investigate the impact of the duration of second stage of labor on risk of severe perineal lacerations (third and fourth degree). METHODS: This population based cohort study was conducted in the Stockholm/Gotland region, Sweden, 2008-2014. Study population included 52 211 primiparous women undergoing vaginal delivery with cephalic presentation at term. Unconditional logistic regression analysis was used to calculate crude and adjusted odds ratios (OR), using 95% confidence intervals (CI)...
February 21, 2017: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/28146571/evolution-of-a-functional-head-joint-in-deep-sea-fishes-stomiidae
#4
Nalani K Schnell, G David Johnson
The head and anterior trunk region of most actinopterygian fishes is stiffened as, uniquely within vertebrates, the pectoral girdles have a direct and often strong connection through the posttemporal to the posterior region of the skull. Members of the mesopelagic fish family Stomiidae have their pectoral girdle separated from the skull. This connection is lost in several teleost groups, but the stomiids have an additional evolutionary novelty-a flexible connection between the occiput and the first vertebra, where only the notochord persists...
2017: PloS One
https://www.readbyqxmd.com/read/28027700/management-of-persistent-occiput-posterior-position-a-substantial-role-of-instrumental-rotation-in-the-setting-of-failed-manual-rotation
#5
Paul Guerby, Mickael Allouche, Caroline Simon-Toulza, Christophe Vayssiere, Olivier Parant, Fabien Vidal
INTRODUCTION: To compare the maternal and neonatal outcomes associated with Instrumental Rotation (IR) to operative vaginal delivery in occiput posterior (OP) position with Thierry's spatulas (TS), in the setting of failed manual rotation (MR). STUDY DESIGN: We led a prospective observational cohort study in a tertiary referral hospital in Toulouse, France. All women presenting in labor with persistent OP position at full cervical dilatation and who delivered vaginally after failed MR and with IR or OP assisted delivery were included from January 2014 to December 2015...
January 23, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28018758/cervical-fracture-subluxation-in-a-patient-with-a-prior-c2-sacrum-fusion-case-report-and-review-of-literature
#6
Yi-Ren Chen, Alvin Y Chan, Kevin K Kumar, Anand Veeravagu
Traumatic injury to an adjacent segment of a previously fused spine is a rare complication of scoliosis surgery. The adjacent spinal segments may be more vulnerable to traumatic fracture or dislocation due to increased strain. We present a patient with prior C2 to sacrum fusion who suffered a C2 fracture/dislocation after falling. A 52-year-old female with a previous C2 to the sacrum fusion for idiopathic scoliosis presented with severe and progressively worsening neck pain after multiple falls. Imaging showed anterior displacement of the C2 vertebral body, fracture of C2, and anterior subluxation of the C1-2 complex on C3...
November 22, 2016: Curēus
https://www.readbyqxmd.com/read/27879507/pedicle-screw-combined-with-lateral-mass-screw-fixation-in-the-treatment-of-basilar-invagination-and-congenital-c2-c3-fusion
#7
Shenglin Wang, Chao Wang, Huijie Leng, Weidong Zhao, Ming Yan, Haitao Zhou
STUDY DESIGN: Clinical evaluation of a surgical fixation technique featuring combined use of pedicle screw and lateral mass screw (LMS). OBJECTIVE: Introduction of a novel technique for the treatment of congenital C2-C3 fusion and basilar invagination (BI). SUMMARY OF BACKGROUND: Posterior occipitocervical fixation using C2 pedicle screw was widely used for BI. However, in cases where BI is concurrent with congenital C2-C3 fusion, the C2 pedicles tend to be thinner than that in normal population and hence more likely to fail...
December 2016: Clinical Spine Surgery
https://www.readbyqxmd.com/read/27832335/a-new-method-for-measurement-of-occipitocervical-angle-by-occiput-c3-angle
#8
Sombat Kunakornsawat, Tinnakorn Pluemvitayaporn, Pritsanai Pruttikul, Suppachai Punpichet, Chaiwat Piyasakulkaew, Alisara Arirachakaran, Jatupon Kongtharvonskul
BACKGROUND: The description of the measurement technique of the posterior occiput-third cervical spine (OC3) angle-before performing occipitocervical fusion is still controversial. Setting an appropriate alignment in occipitocervical instrumentation is important for successful fixation surgery. Several methods were used for quantifying occipitocervical alignment on the lateral radiograph. This study was performed to describe a measurement technique of OC3 angle and comparing reliability and reproducibility in the measurement of occipitocervical angle with previous method...
November 10, 2016: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/27830891/morphometric-multislice-computed-tomography-examination-of-the-craniovertebral-junction-in-neck-flexion-and-extension
#9
Slobodan Marinkovic, Ivan Milić, Igor Djorić, Luciano Brigante, Aleksandar Miljatović, Laslo Puškaš, Slobodan Kapor, Jelena Boljanović
BACKGROUND: Detailed study of the craniovertebral junction (CVJ) is necessary to completely understand the mechanism of its flexion and extension. MATERIALS AND METHODS: One cadaver head was sectioned in the sagittal plane. Also, in 22 volunteers, examined using the multislice computerized tomography (MSCT), 14 parameters and 2 angles were measured in the neutral position, flexion and extension. RESULTS: The obtained measurements showed the anterior part of the occiput to move inferiorly in flexion, and the anterior atlas arch and the tip of the dens to get closer to the basion...
November 10, 2016: Folia Morphologica (Warsz)
https://www.readbyqxmd.com/read/27757567/traumatic-atlanto-occipital-dislocation-in-children-a-case-based-update-on-clinical-characteristics-management-and-outcome
#10
REVIEW
Thomas Beez, Jennifer Brown
BACKGROUND: Atlanto-occipital dislocation (AOD) is a rare but severe sequela of high energy trauma. Children are at increased risk, due to their immature spine and biomechanical characteristics. LITERATURE REVIEW: The prevailing mechanism of injury is motor vehicle collision as passenger. AOD commonly presents with cardiorespiratory arrest, spinal cord injury or cranial nerve deficits. Concomitant injuries, such as traumatic brain injury, are frequently encountered...
January 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/27704673/re-narrow-subpubic-arch-angle-is-associated-with-higher-risk-of-persistent-occiput-posterior-position-at-delivery-t-ghi-a-youssef-f-martelli-f-bellussi-e-aiello-g-pilu-n-rizzo-t-frusca-d-arduini-and-g-rizzo-ultrasound-obstet-gynecol-2016-48-511-515
#11
COMMENT
https://www.readbyqxmd.com/read/27615281/cranial-ontogeny-of-the-early-triassic-basal-cynodont-galesaurus-planiceps
#12
Sandra C Jasinoski, Fernando Abdala
Ontogenetic changes in the skull and mandible of thirty-one specimens of Galesaurus planiceps, a basal non-mammaliaform cynodont from the Early Triassic of South Africa, are documented. The qualitative survey indicated eight changes in the craniomandibular apparatus occurred during growth, dividing the sample into three ontogenetic stages: juvenile, subadult, and adult. Changes in the temporal region, zygomatic arch, occiput, and mandible occurred during the transition from the subadult to adult stage at a basal skull length of 90 mm...
September 12, 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27609143/persistent-occiput-posterior-position-associated-to-asynclitism-solved-by-manual-rotation-is-always-possible-to-perform-safely-this-maneuver
#13
Antonio Malvasi, Andrea Tinelli
No abstract text is available yet for this article.
September 9, 2016: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/27559456/postoperative-increase-in-occiput-c2-angle-negatively-impacts-subaxial-lordosis-after-occipito-upper-cervical-posterior-fusion-surgery
#14
Taigo Inada, Takeo Furuya, Koshiro Kamiya, Mitsutoshi Ota, Satoshi Maki, Takane Suzuki, Kazuhisa Takahashi, Masashi Yamazaki, Masaaki Aramomi, Chikato Mannoji, Masao Koda
STUDY DESIGN: Retrospective case series. PURPOSE: To elucidate the impact of postoperative occiput-C2 (O-C2) angle change on subaxial cervical alignment. OVERVIEW OF LITERATURE: In the case of occipito-upper cervical fixation surgery, it is recommended that the O-C2 angle should be set larger than the preoperative value postoperatively. METHODS: The present study included 17 patients who underwent occipito-upper cervical spine (above C4) posterior fixation surgery for atlantoaxial subluxation of various etiologies...
August 2016: Asian Spine Journal
https://www.readbyqxmd.com/read/27436209/muscle-insertion-line-as-a-simple-landmark-to-identify-the-transverse-sinus-when-neuronavigation-is-unavailable
#15
Juri Kivelev, Riku Kivisaari, Mika Niemelä, Juha Hernesniemi
OBJECTIVE: Skull opening in occipital and suboccipital regions might be associated with risk of damage to the transverse venous sinus and the confluence of sinuses. We analyze the value of magnetic resonance (MR) imaging in localizing the venous sinuses in relation to the superior muscle insertion line (MIL) on the occipital bone. METHODS: We retrospectively analyzed head MR images of 100 consecutive patients imaged for any reason from 1 January 2013. All MR images were interpreted by a radiologist (R...
October 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27396377/modified-skin-incision-for-avoiding-the-lesser-occipital-nerve-and-occipital-artery-during-retrosigmoid-craniotomy-potential-applications-for-enhancing-operative-working-distance-and-angles-while-minimizing-the-risk-of-postoperative-neuralgias-and-intraoperative
#16
R Shane Tubbs, Fabian N Fries, Charles Kulwin, Martin M Mortazavi, Marios Loukas, Aaron A Cohen-Gadol
Chronic postoperative neuralgias and headache following retrosigmoid craniotomy can be uncomfortable for the patient. We aimed to better elucidate the regional nerve anatomy in an effort to minimize this postoperative complication. Ten adult cadaveric heads (20 sides) were dissected to observe the relationship between the lesser occipital nerve and a traditional linear versus modified U incision during retrosigmoid craniotomy. Additionally, the relationship between these incisions and the occipital artery were observed...
October 2016: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/27373937/stabilization-of-the-craniovertebral-junction-with-clivus-plate-constructs-biomechanical-comparison-with-conventional-technique
#17
Wei Ji, Jie Tong, Zhiping Huang, Minghui Zheng, Xiuhua Wu, Jianting Chen, Qingan Zhu
BACKGROUND: Ventral defect caused by resection of the lesions involving the upper cervical spine was commonly reconstructed with a fabricated mesh cage. Recently, a clival screw and plate fitted to the osseous anatomy of the craniovertebral junction was developed for this pathological state. OBJECTIVE: To evaluate the stability a clivus plate system fixation (CPSF) for the craniovertebral junction and compared with a conventional fashioned mesh cage fixation (FMCF)...
June 30, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27355085/-clinical-triad-findings-in-pediatric-klippel-feil-patients
#18
Dino Samartzis, Prakasam Kalluri, Jean Herman, John P Lubicky, Francis H Shen
BACKGROUND: It has been propagated that patients with Klippel-Feil syndrome (KFS) exhibit "clinical triad" findings (CTFs), known as a short neck, low posterior hairline, and limited cervical range of motion (ROM). However, the literature has noted that up to 50 % of KFS cases may not present with such findings and the reasoning behind such assertions remains speculative. As such, the following study addressed the association between CTFs to that of congenitally-fused cervical segments and other risk factors in KFS patients...
2016: Scoliosis and Spinal Disorders
https://www.readbyqxmd.com/read/27341056/ct-based-morphometric-analysis-of-the-occipital-condyle-focus-on-occipital-condyle-screw-insertion
#19
Jinsong Zhou, Alejandro A Espinoza Orías, Xia Kang, Jade He, Zhihai Zhang, Nozomu Inoue, Howard S An
OBJECTIVE The segmental occipital condyle screw (OCS) is an alternative fixation technique in occipitocervical fusion. A thorough morphological study of the occipital condyle (OC) is critical for OCS placement. The authors set out to introduce a more precise CT-based method for morphometric analysis of the OC as it pertains to the placement of the segmental OCS, and they describe a novel preoperative simulation method for screw placement. Two new clinically relevant parameters, the height available for the OCS and the warning depth, are proposed...
November 2016: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/27261967/chronic-c1-c2-rotatory-subluxation-reduced-by-c1-lateral-mass-screws-and-c2-translaminar-screws-a-case-report
#20
William F Lavelle, Kathryn Palomino, Siddharth A Badve, Stephen A Albanese
BACKGROUND: C1-C2 rotatory subluxation can result from a variety or etiologies. Pediatric patients are particularly susceptible to C1-C2 rotatory subluxation. If left untreated the condition is termed an atlantoaxial rotatory fixation (AARF) and chronic neck pain and deformity can result. Patients failing conservative treatment or those with recurrent or chronic rotatory subluxation may require halo treatment or surgical intervention. This illustrative case report is about a patient with chronic C1-C2 AARF who was treated with C1 lateral mass screws and C2 translaminar screws, a treatment that has not been addressed by this technique in a pediatric population...
June 2, 2016: Journal of Pediatric Orthopedics
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