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https://www.readbyqxmd.com/read/28733037/efficient-probabilistic-finite-element-analysis-of-a-lumbar-motion-segment
#1
Dana J Coombs, Paul J Rullkoetter, Peter J Laz
Finite element models of the lumbar spine are useful in assessing biomechanics and performance of implants. Models are often developed using the anatomy of an individual subject. Average mechanical property values for the annulus and other soft tissue structures are typically utilized from the literature, as data for the same subject are not available. However, these properties can have significant variability. While probabilistic methods enable the impact of soft tissue property variability on spine mechanics to be assessed, they often require lengthy computation times...
July 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28727709/transforaminal-percutaneous-endoscopic-discectomy-and-foraminoplasty-after-lumbar-spinal-fusion-surgery
#2
Jian-Jun Wu, Hui-Zhen Chen, Changkun Zheng
BACKGROUND: The most common causes of pain following lumbar spinal fusions are residual herniation, or foraminal fibrosis and foraminal stenosis that is ignored, untreated, or undertreated. The original surgeon may advise his patient that nothing more can be done in his opinion that the nerve was visually decompressed by the original surgery. Post-operative imaging or electrophysiological assessment may be inadequate to explain all the reasons for residual or recurrent symptoms. Treatment of failed lumbar spinal fusions by repeat traditional open revision surgery usually incorporates more extensive decompression causing increased instability and back pain...
July 2017: Pain Physician
https://www.readbyqxmd.com/read/28725916/cervical-extraforaminal-ligaments-an-anatomical-study
#3
Mehmet Arslan, Halil İbrahim Açar, Ayhan Cömert
PURPOSE: The purpose of this study was to elucidate the anatomy and clinical importance of extraforaminal ligaments in the cervical region. METHODS: This study was performed on eight embalmed cadavers. The existence and types of extraforaminal ligaments were identified. The morphology, quantity, origin, insertion, and orientation of the extraforaminal ligaments in the cervical region were observed. RESULTS: Extraforaminal ligaments could be divided into two types: transforaminal ligaments and radiating ligaments...
July 19, 2017: Surgical and Radiologic Anatomy: SRA
https://www.readbyqxmd.com/read/28710046/image-guidance-to-aid-pedicle-screw-fixation-of-a-lumbar-fracture-dislocation-injury-in-a-toddler
#4
John K Houten, Jonathan Nahkla, Shashank Ghandi
BACKGROUND: Pedicle screw fixation of the lumbar spine in children less than two years of age is particularly challenging, as successful cannulation of the small pedicle dimensions require a high level of precision and there are no implants specifically designed for the infantile spine. Image-guided navigation is commonly used in adult spinal surgery and may be particularly helpful for placement of spinal screws where the bony anatomy is small and/or anatomically complex as in the upper cervical area...
July 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28696485/repeatability-of-a-dislocation-spinal-cord-injury-model-in-a-rat-a-high-speed-biomechanical-analysis
#5
Stephen Mattucci, Jie Liu, Paul Fijal, Wolfram Tetzlaff, Thomas R Oxland
Dislocation is the most common, and severe, spinal cord injury (SCI) mechanism in humans, yet there are few preclinical models. While dislocation in the rat model has been shown to produce unique outcomes, like other closed column models it exhibits higher outcome variability. Refinement of the dislocation model will enhance the testing of neuroprotective strategies, further biomechanical understanding, and guide therapeutic decisions. The overall objective of this study is to improve biomechanical repeatability of a dislocation SCI model in the rat, through the following specific aims: i) design new injury clamps that pivot and self-align to the vertebrae; ii) measure intervertebral kinematics during injury using the existing and redesigned clamps; and iii) compare relative motion at the vertebrae-clamp interface to determine which clamps provide the most rigid connection...
July 11, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28694596/cadaveric-study-for-ideal-dorsal-pedicle-screw-entry-point
#6
Sandeep Sonone, Aditya Anand Dahapute, Mahendra Pal, Siddharth Virani, Rohan Gala
OBJECTIVE: To determine the entry for the dorsal pedicular screw in relation to the notch present at the junction of base of the lateral margin of superior articular process with superior border of transverse process in dorsal spine. The advantage of this technique is a constant and easily identifiable entry point which does not involve partial resection of the inferior facet, thus maintaining stability and maintaining the well defined transverse and sagittal screw angles and decreasing the incidence of medial and inferior pedicle violation...
April 2017: Journal of Craniovertebral Junction and Spine
https://www.readbyqxmd.com/read/28681461/the-role-of-the-primitive-lateral-basilovertebral-anastomosis-of-padget-in-variations-of-the-vertebrobasilar-arterial-system
#7
Lydia Gregg, Philippe Gailloud
PURPOSE: The primitive lateral basilovertebral anastomosis (PLBA) is an embryonic longitudinal anastomotic channel that transiently interconnects the developing branches of the vertebrobasilar system. This study reviews the anatomy of the PLBA and describes several variants associated with its partial persistence. METHODS: Four types of vertebrobasilar anomalies linked to the PLBA are illustrated by 13 angiographic observations. RESULTS: The angiographic appearances of (i) typical and atypical persistent trigeminal artery variants, (ii) common trunks of origin for one, two or three cerebellar arteries, (iii) aberrant origins of the cerebellar arteries, and (iv) vertebrobasilar duplications are described...
July 6, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28671644/biosensing-motor-neuron-membrane-potential-in-live-zebrafish-embryos
#8
Lorena Benedetti, Anna Ghilardi, Laura Prosperi, Maura Francolini, Luca Del Giacco
The protocols described here are designed to allow researchers to study cell communication without altering the integrity of the environment in which the cells are located. Specifically, they have been developed to analyze the electrical activity of excitable cells, such as spinal neurons. In such a scenario, it is crucial to preserve the integrity of the spinal cell, but it is also important to preserve the anatomy and physiological shape of the systems involved. Indeed, the comprehension of the manner in which the nervous system-and other complex systems-works must be based on a systemic approach...
June 26, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28665491/feasibility-of-dynamic-adaptive-passive-scattering-proton-therapy-with-computed-tomography-image-guidance-in-the-lung
#9
Shunsuke Moriya, Hidenobu Tachibana, Kenji Hotta, Naoki Nakamura, Sakae Takeji, Tetsuo Akimoto
PURPOSE: Hypo-fractionated proton beam therapy (PBT) is an approach that has been increasingly explored over the past decade. It requires high geometric accuracy for targeting of the PBT beams. However, image-guided PBT is currently commonly performed with kV X-ray images of bony anatomy. A dynamic adaptive passive scattering PBT system using computed tomography-based three-dimensional image guidance was developed, and its effectiveness was then evaluated retrospectively in patients with non-small cell lung cancer (NSCLC)...
June 30, 2017: Medical Physics
https://www.readbyqxmd.com/read/28637483/analyzing-human-decisions-in-igrt-of-head-and-neck-cancer-patients-to-teach-image-registration-algorithms-what-experts-know
#10
Eva Maria Stoiber, Nina Bougatf, Hendrik Teske, Christian Bierstedt, Dieter Oetzel, Jürgen Debus, Rolf Bendl, Kristina Giske
BACKGROUND: In IGRT of deformable head-and-neck anatomy, patient setup corrections are derived by rigid registration methods. In practice, experienced radiation therapists often correct the resulting vectors, thus indicating a different prioritization of alignment of local structures. Purpose of this study is to transfer the knowledge experts apply when correcting the automatically generated result (pre-match) to automated registration. METHODS: Datasets of 25 head-and-neck-cancer patients with daily CBCTs and corresponding approved setup correction vectors were analyzed...
June 21, 2017: Radiation Oncology
https://www.readbyqxmd.com/read/28625308/the-role-of-ultrasonography-in-obstetric-anesthesia
#11
REVIEW
Allison Lee, John P R Loughrey
Ultrasonography is increasingly being viewed as an everyday tool in obstetric anesthesia. For the administration of spinal or epidural anesthesia, it reduces needle redirection attempts in patients with difficult anatomy. In the less frequent scenario of a collapsed patient, it helps with assessment in the form of transthoracic echocardiography. Abdominal blocks require ultrasound guidance for safe and anatomically correct placement. Accurate assessment of gastric volume status with ultrasound would be a useful everyday skill if it is adopted into mainstream practice...
March 2017: Best Practice & Research. Clinical Anaesthesiology
https://www.readbyqxmd.com/read/28616343/debranching-aortic-surgery
#12
REVIEW
Manuel Alonso Pérez, José Manuel Llaneza Coto, José Antonio Del Castro Madrazo, Carlota Fernández Prendes, Mario González Gay, Amer Zanabili Al-Sibbai
Conventional open surgery still remains as the gold standard of care for aortic arch and thoracoabdominal pathology. In centers of excellence, open repair of the arch has been performed with 5% immediate mortality and a low rate of complications; however overall mortality rates are around 15%, being up to 40% of all patients rejected for treatment due to their age or comorbidities. For thoracoabdominal aortic pathology, data reported from centers of excellence show immediate mortality rates from 5% to 19%, spinal cord ischemia from 2...
May 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28609321/change-in-lung-volume-following-thoracoscopic-anterior-spinal-fusion-surgery-a-3-dimensional-computed-tomography-investigation
#13
Caroline G Yu, Caroline A Grant, Maree T Izatt, Robert D Labrom, Geoffrey N Askin, Clayton J Adam, J Paige Little
STUDY DESIGN: Lung volumes and thoracic anatomy were measured from low-dose computed tomography (CT) scans preoperatively and 2 years following thoracoscopic anterior spinal fusion (TASF) for adolescent idiopathic scoliosis (AIS). OBJECTIVE: The aim of this study was to assess changes in lung volume after TASF surgical correction. SUMMARY OF BACKGROUND DATA: AIS patients are known to have decreased pulmonary function as a consequence of their spinal and ribcage deformity...
June 15, 2017: Spine
https://www.readbyqxmd.com/read/28604466/unique-considerations-in-spinal-cord-stimulator-placement-in-pediatrics-a-case-report
#14
Eugene Kim, Giovanni Cucchiaro
Spinal cord stimulation can be a valuable treatment option in the management of neuropathic pain in select pediatric patients. We present a unique case of a 16-year-old girl with Klippel-Trenaunay-Weber syndrome and scoliosis who required the placement of a spinal cord stimulator (SCS) for severe sciatic nerve neuropathic pain after a right above-knee amputation. Several attempts at lead placement were required before successful pain coverage was achieved because of late recognition of significant vertebral body rotation...
June 8, 2017: A & A Case Reports
https://www.readbyqxmd.com/read/28603566/current-concepts-in-pediatric-cervical-spine-trauma
#15
Kunal Shah, Agnivesh Tikoo, Manish K Kothari, Abhay Nene
BACKGROUND: Pediatric spinal trauma is rare and challenging entity. Although cervical spine is commonly affected, it is often missed on routine imaging investigations. Therefore better understanding of growing spine and its patho-physiology is crucial. METHODS: Articles related to pediatric cervical trauma were searched on Pubmed and other online research data banks. We have summarized unique anatomy of pediatric spine, investigations followed by common injury patterns, their diagnostic challenges and management...
2017: Open Orthopaedics Journal
https://www.readbyqxmd.com/read/28598291/spinal-navigation-for-posterior-instrumentation-of-c1-2-instability-using-a-mobile-intraoperative-ct-scanner
#16
Marcus Czabanka, Julien Haemmerli, Nils Hecht, Bettina Foehre, Klaus Arden, Thomas Liebig, Johannes Woitzik, Peter Vajkoczy
OBJECTIVE Spinal navigation techniques for surgical fixation of unstable C1-2 pathologies are challenged by complex osseous and neurovascular anatomy, instability of the pathology, and unreliable preoperative registration techniques. An intraoperative CT scanner with autoregistration of C-1 and C-2 promises sufficient accuracy of spinal navigation without the need for further registration procedures. The aim of this study was to analyze the accuracy and reliability of posterior C1-2 fixation using intraoperative mobile CT scanner-guided navigation...
June 9, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/28593553/prenatal-diagnosis-of-spina-bifida-from-intracranial-translucency-to-intrauterine-surgery
#17
Waldo Sepulveda, Amy E Wong, Francisco Sepulveda, Juan L Alcalde, Juan C Devoto, Felipe Otayza
Accurate and timely prenatal diagnosis of spina bifida (SB) is a major goal of modern antenatal care. Prenatal screening for open SB should be first performed at the time of routine first-trimester ultrasound by examining the posterior fossa for obliteration or non-visualization of the fourth ventricle ("intracranial translucency") and cisterna magna. The second step of screening is the second-trimester anatomy scan, at which time the features of the Chiari type II malformation should be looked for, including ventriculomegaly, scalloping of the frontal bones ("lemon" sign), and backward and caudal displacement of the cerebellar vermis with obliteration of the cisterna magna ("banana" sign)...
June 7, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28583042/cervical-cord-decompression-following-embolisation-of-a-giant-cervical-vertebro-vertebral-arteriovenous-fistula
#18
George H Tse, Umang J Patel, Stuart C Coley, Richard A Dyde
Arteriovenous fistulation between the vertebral arteries to extradural (epidural) veins, termed vertebro-vertebral arteriovenous fistulae, are uncommon diagnoses without established diagnostic algorithms or treatment options. Minimal evidence exists describing the management of this pathology. Endovascular treatment was performed under general anaesthesia by coil occlusion of the vertebral artery from the point of the fistula to the mid-vertebral artery. Repeat magnetic resonance angiographic imaging one week following the procedure confirmed an 80% reduction in the size of the epidural vein and decompression of the cervical spinal cord...
January 1, 2017: Interventional Neuroradiology
https://www.readbyqxmd.com/read/28580526/deformable-appearance-pyramids-for-anatomy-representation-landmark-detection-and-pathology-classification
#19
Qiang Zhang, Abhir Bhalerao, Charles Hutchinson
PURPOSE: Representation of anatomy appearance is one of the key problems in medical image analysis. An appearance model represents the anatomies with parametric forms, which are then vectorised for prior learning, segmentation and classification tasks. METHODS: We propose a part-based parametric appearance model we refer to as a deformable appearance pyramid (DAP). The parts are delineated by multi-scale local feature pyramids extracted from an image pyramid. Each anatomy is represented by an appearance pyramid, with the variability within a population approximated by local translations of the multi-scale parts and linear appearance variations in the assembly of the parts...
June 3, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28578699/treating-lung-cancer-with-dynamic-conformal-arc-therapy-a-dosimetric-study
#20
Primož Peterlin, Karmen Stanič, Ignasi Méndez, Andrej Strojnik
BACKGROUND: Lung cancer patients are often in poor physical condition, and a shorter treatment time would reduce their discomfort. Dynamic conformal arc therapy (DCAT) offers a shorter treatment time than conventional 3D conformal radiotherapy (3D CRT) and is usually available even in departments without inverse planning possibilities. We examined its suitability as a treatment modality for lung cancer patients. METHODS: On a cohort of 35 lung cancer patients, relevant dosimetric parameters were compared in respective DCAT and 3D CRT treatment plans...
June 2, 2017: Radiation Oncology
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