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Spinal stability

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https://www.readbyqxmd.com/read/28746125/comparison-of-pedicle-screw-fixation-strength-among-different-transpedicular-trajectories-a-finite-element-study
#1
Keitaro Matsukawa, Yoshiyuki Yato, Richard A Hynes, Hideaki Imabayashi, Naobumi Hosogane, Yasuo Yoshihara, Takashi Asazuma, Koichi Nemoto
STUDY DESIGN: Comparative biomechanical study by finite element (FE) method. OBJECTIVE: To investigate the pullout strength of pedicle screws using different insertional trajectories. SUMMARY OF BACKGROUND DATA: Pedicle screw fixation has become the gold standard for spinal fusion, however, not much has been done to clarify how the fixation strength of pedicle screws are affected by insertional trajectories and bone properties. MATERIALS AND METHODS: Three-dimensional FE models of 20 L4 vertebrae were constructed from the computed tomographic data...
August 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28742140/short-16-mer-locked-nucleic-acid-splice-switching-oligonucleotides-restore-dystrophin-production-in-duchenne-muscular-dystrophy-myotubes
#2
Vanessa Borges Pires, Ricardo Simões, Kamel Mamchaoui, Célia Carvalho, Maria Carmo-Fonseca
Splice-switching antisense oligonucleotides (SSOs) offer great potential for RNA-targeting therapies, and two SSO drugs have been recently approved for treating Duchenne Muscular Dystrophy (DMD) and Spinal Muscular Atrophy (SMA). Despite promising results, new developments are still needed for more efficient chemistries and delivery systems. Locked nucleic acid (LNA) is a chemically modified nucleic acid that presents several attractive properties, such as high melting temperature when bound to RNA, potent biological activity, high stability and low toxicity in vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28740742/radical-surgery-of-only-the-anterior-elements-of-the-spine-at-the-posterior-element-fusion-level-due-to-metastatic-thyroid-cancer
#3
Ryuto Tsuchiya, Kazuki Fujimoto, Kazuhide Inage, Sumihisa Orita, Yasuhiro Shiga, Hiroto Kamoda, Kazuyo Yamauchi, Miyako Suzuki, Jun Sato, Koki Abe, Hirohito Kanamoto, Masahiro Inoue, Hideyuki Kinoshita, Masaki Norimoto, Tomotaka Umimura, Masao Koda, Takeo Furuya, Junichi Nakamura, Kazuhisa Takahashi, Seiji Ohtori
Spinal metastasis of differentiated thyroid cancer can have a favorable prognosis if radical surgery is performed. We encountered a case of spinal metastasis involving three anterior vertebral bodies at the posterior element fusion level and successfully achieved adequate stability by radical surgery involving only the anterior elements. A 67-year-old woman who had numbness and muscle weakness in the lower limbs caused by metastatic spinal tumor at the posterior element fusion level of L1-L3 vertebrae was treated with radical surgery of only the anterior element to gain stability...
2017: Case Reports in Orthopedics
https://www.readbyqxmd.com/read/28739313/cardiac-amyloidosis-an-update-on-pathophysiology-diagnosis-and-treatment
#4
REVIEW
Omar K Siddiqi, Frederick L Ruberg
The amyloidoses are a group of systemic diseases characterized by organ deposition of misfolded protein fragments of diverse origins. The natural history of the disease, involvement of other organs, and treatment options vary significantly based on the protein of origin. In AL amyloidosis, amyloid protein is derived from immunoglobulin light chains, and most often involves the kidneys and the heart. ATTR amyloidosis is categorized as mutant or wild-type depending on the genetic sequence of the transthyretin (TTR) protein produced by the liver...
July 13, 2017: Trends in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28736791/control-of-standing-balance-at-leaning-postures-with-functional-neuromuscular-stimulation-following-spinal-cord-injury
#5
Musa L Audu, Brooke M Odle, Ronald J Triolo
This study systematically explored the potential of applying feedback control of functional neuromuscular stimulation (FNS) for stabilizing various erect and leaning standing postures after spinal cord injury (SCI). Perturbations ranging from 2 to 6% body weight were applied to two subjects with motor complete thoracic level SCI who were proficient at standing with implanted multichannel neural stimulators to activate the ankle, knee, hip and trunk muscles. The subjects stood with four different postures: erect, forward, forward-right and forward-left...
July 24, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28732510/protective-and-therapeutic-role-of-2-carba-cyclic-phosphatidic-acid-in-demyelinating-disease
#6
Shinji Yamamoto, Kota Yamashina, Masaki Ishikawa, Mari Gotoh, Sosuke Yagishita, Kensuke Iwasa, Kei Maruyama, Kimiko Murakami-Murofushi, Keisuke Yoshikawa
BACKGROUND: Multiple sclerosis is a neuroinflammatory demyelinating and neurodegenerative disease of the central nervous system characterized by recurrent and progressive demyelination/remyelination cycles, neuroinflammation, oligodendrocyte loss, demyelination, and axonal degeneration. Cyclic phosphatidic acid (cPA) is a natural phospholipid mediator with a unique cyclic phosphate ring structure at the sn-2 and sn-3 positions of the glycerol backbone. We reported earlier that cPA elicits a neurotrophin-like action and protects hippocampal neurons from ischemia-induced delayed neuronal death...
July 21, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28728573/splicing-arrays-reveal-novel-rbm10-targets-including-smn2-pre-mrna
#7
Leslie C Sutherland, Philippe Thibault, Mathieu Durand, Elvy Lapointe, Jose M Knee, Ariane Beauvais, Irina Kalatskaya, Sarah C Hunt, Julie J Loiselle, Justin G Roy, Sarah J Tessier, Gustavo Ybazeta, Lincoln Stein, Rashmi Kothary, Roscoe Klinck, Benoit Chabot
BACKGROUND: RBM10 is an RNA binding protein involved in message stabilization and alternative splicing regulation. The objective of the research described herein was to identify novel targets of RBM10-regulated splicing. To accomplish this, we downregulated RBM10 in human cell lines, using small interfering RNAs, then monitored alternative splicing, using a reverse transcription-PCR screening platform. RESULTS: RBM10 knockdown (KD) provoked alterations in splicing events in 10-20% of the pre-mRNAs, most of which had not been previously identified as RBM10 targets...
July 20, 2017: BMC Molecular Biology
https://www.readbyqxmd.com/read/28728077/comparison-of-spinal-stability-following-motor-control-and-general-exercises-in-nonspecific-chronic-low-back-pain-patients
#8
MohammadBagher Shamsi, Javad Sarrafzadeh, Aliashraf Jamshidi, Navid Arjmand, Farshid Ghezelbash
BACKGROUND: Motor control exercise was claimed to improve spinal stability in patients with chronic non-specific back pain, but to investigate the effectiveness of this exercise, other outcome measures have been used rather than spinal stability itself. The aim of our study is to assess motor control exercise effects on spinal stability using a biomechanical model. METHODS: Fifty-one patients were assigned to either motor control or general exercises. Before and after trainings, participants were tested for spinal stability at seven isometric tasks...
July 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28727709/transforaminal-percutaneous-endoscopic-discectomy-and-foraminoplasty-after-lumbar-spinal-fusion-surgery
#9
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/28723772/anatomic-investigation-of-lumbar-transforaminal-fenestration-approach-and-its-clinical-application-in-far-lateral-disc-herniation
#10
Baoshan Xu, Haiwei Xu, Jean Destandau, Xinlong Ma, Jian He, Qun Xia, Ning Ji, Qiang Yang, Yue Liu, Hongfeng Jiang
Treating lumbar disease at the intervertebal foramina is controversial because we lack an approach providing sufficient exposure and preserving spinal stability. The primary objective of this study was to investigate the feasibility of the transforaminal fenestration (TFF) approach for treating lumbar disease involving the intervertebal foramina.In the anatomic study of 30 adult cadaveric lumbar spine specimens, the TFF approach was used from L1 to S1. The scope of resection was measured manually and on 3D CT images...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28722336/evidence-for-the-modulation-of-nociception-in-mice-by-central-mast-cells
#11
C L Kissel, K J Kovács, A A Larson
BACKGROUND: Hyperalgesia that develops following nerve ligation corresponds temporally and in magnitude with the number of thalamic mast cells located contralateral to the ligature. We tested the possibility that mast cells modulate nociception centrally, similar to their role in the periphery. METHODS: We examined the central effect of two hyperalgesic compounds that induce mast cell degranulation and of stabilized mast cells using cromolyn. RESULTS: Thermal hyperalgesia (tail flick) induced by nerve growth factor (NGF, a neurotrophic compound) and mechanical hyperalgesia (von Frey) induced by dynorphin A (1-17) (opioid compound) each correlated with the per cent of thalamic mast cells that were degranulated...
July 19, 2017: European Journal of Pain: EJP
https://www.readbyqxmd.com/read/28721206/a-bipedal-mammalian-model-for-spinal-cord-injury-research-the-tammar-wallaby
#12
Norman R Saunders, Katarzyna M Dziegielewska, Sophie C Whish, Lyn A Hinds, Benjamin J Wheaton, Yifan Huang, Steve Henry, Mark D Habgood
Background: Most animal studies of spinal cord injury are conducted in quadrupeds, usually rodents. It is unclear to what extent functional results from such studies can be translated to bipedal species such as humans because bipedal and quadrupedal locomotion involve very different patterns of spinal control of muscle coordination. Bipedalism requires upright trunk stability and coordinated postural muscle control; it has been suggested that peripheral sensory input is less important in humans than quadrupeds for recovery of locomotion following spinal injury...
2017: F1000Research
https://www.readbyqxmd.com/read/28720987/management-of-post-traumatic-neglected-cervical-facet-dislocation
#13
Vinay Prabhat, Tankeshwar Boruah, Hitesh Lal, Ramesh Kumar, Ashish Dagar, Harekrushna Sahu
BACKGROUND: Post-traumatic unilateral or bilateral sub-axial cervical spine dislocations with locked facets are quite common. In developing countries like India, many patients with cervical injuries report late due to many reasons like rural backgrounds, lack of infrastructures and skilled surgeons, unawareness, poor socioeconomic status, lack of transportation to the specialized center with proper facility, etc. Early management is essential to maximize better neurological outcome. Delayed or neglected presentation makes treatment more challenging...
April 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28720984/spinal-cord-injury-the-role-of-surgical-treatment-for-neurological-improvement
#14
REVIEW
N Rath, B Balain
Acute spinal cord injury (ASCI) is common and no consensuses have been reached regarding timing of surgical decompression. This article highlights the main issues regarding surgical management of ASCI patients. The importance of timing of surgery along with physiological stability of the cord, and indications for surgery has been discussed to facilitate better understanding of the condition. The importance of the type of injury to the spinal column, besides the cord injury, is also discussed. A brief review of relevant literature has been done to try and answer the question whether early or late surgical treatment for ASCI is better than conservative management, reflecting the ethos of treatment for these problems in Robert Jones And Agnes Hunt Orthopaedic Hospital in Oswestry...
April 2017: Journal of Clinical Orthopaedics and Trauma
https://www.readbyqxmd.com/read/28719806/effect-of-cage-design-supplemental-posterior-instrumentation-and-approach-on-primary-stability-of-a-lumbar-interbody-fusion-a-biomechanical-in-vitro-study
#15
Werner Schmoelz, Sabrina Sandriesser, Oded Loebl, Marlies Bauer, Dietmar Krappinger
BACKGROUND: There are various techniques and approaches for lumbar interbody fusion differing in access, cage type and type of supplemental posterior instrumentation. While a transforaminal access usually includes a hemifacetectomy, the facet joint can be preserved with a more lateral extraforaminal access. The supplemental posterior instrumentation required for both fusion techniques is still debated. The purpose of the present study was to compare primary stability of the two accesses for two different cage types with none, unilateral and bilateral supplemental posterior instrumentation...
July 8, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28715333/wheelchair-neuroprosthesis-for-improving-dynamic-trunk-stability
#16
Kramay Patel, Matija Milosevic, Kimitaka Nakazawa, Milos R Popovic, Kei Masani
Trunk instability is a major problem for individuals with thoracic and cervical spinal cord injury. Functional electrical stimulation (FES) neuroprosthesis, a technology that uses small electrical currents to artificially contract muscles, has previously been utilized to improve trunk stability during quasistatic and dynamic sitting. The aim of this study was to develop the first powered wheelchair-based neuroprosthesis and to test its feasibility for improving trunk stability. Eleven male, able-bodied individuals participated in the feasibility study...
July 14, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28713634/pedicle-screw-placement-accuracy-impact-and-comparison-between-grading-systems
#17
Theologou Marios, Theologou Theologos, Zevgaridis Dimitrios, Skoulios Nikolaos, Matejic Slavisa, Tsonidis Christos
BACKGROUND: Pedicle screw instrumentation is widely used for spinal stabilization. However, the accuracy for free-hand screw placement ranges from 69% to 94%. This study assesses the value of the existing classification systems, and investigates their impact on the ability to assess the accuracy of free-hand screw placement. METHODS: Data were collected retrospectively from the medical records of 34 patients who received 224 pedicle screws placed utilizing a free-hand technique...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28713049/patient-reported-outcomes-after-surgical-stabilization-of-spinal-tumors-symptom-based-validation-of-the-spinal-instability-neoplastic-score-sins-and-surgery
#18
Ibrahim Hussain, Ori Barzilai, Anne S Reiner, Natalie DiStefano, Lily McLaughlin, Shahiba Ogilvie, Mark Bilsky, Ilya Laufer
BACKGROUND CONTEXT: Neoplastic spinal instability is movement-related pain or neurologic compromise under physiologic loads with the Spinal Instability Neoplastic Score (SINS) developed to facilitate diagnosis. There is a paucity of evidence that mechanical instability correlates with patient-reported symptoms and that surgical stabilization significantly improves these patient-reported outcomes (PRO). PURPOSE: The objective of this study was to determine if SINS correlates with patient-reported preoperative pain and disability and if surgical stabilization significantly improves PRO...
July 13, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28712900/surgical-treatment-of-segmental-spinal-dysgenesis-selection-of-an-optimal-type-of-fusion
#19
Olga M Pavlova, Sergey O Ryabykh, Danil A Kozyrev, Alexander V Gubin
OBJECTIVE: The aim of this study is to select optimal fusion type for segmental spinal dysgenesis (SSD). METHODS: We analyzed 45 patients with SSD (37 from the literature and eight from our institution). Each case was evaluated for specific clinical and radiological criteria, types and results of the treatment. RESULT: Anterior fusion (AF) was perfomed in two patients (4.4%), posterior fusion (PF) in 11 patients (24.4%) and antero-posterior fusion (APF) in 33 patients (73...
July 13, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28712731/cervical-dystonia-patients-display-subclinical-gait-changes
#20
Marcello Esposito, Raffaele Dubbioso, Silvio Peluso, Antonio Picone, Bruno Corrado, Clemente Servodio Iammarone, Roberto Allocca, Fiore Manganelli, Lucio Santoro, Alfonso Fasano
INTRODUCTION: Gait disorders in cervical dystonia (CD) are reported in patients under DBS or in severe cases complicated with spinal deformities. OBJECTIVE: to assess walking motor pattern in CD patients without DBS and not presenting scoliosis. METHODS: Computerized gait analysis (CGA) was performed in CD patients, before and after botulinum toxin (BoNT) injections, and in healthy controls (HC). Spatiotemporal (ST) parameters were compared between CD and HC groups...
July 10, 2017: Parkinsonism & related Disorders
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