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https://www.readbyqxmd.com/read/28735464/radiation-dose-reduction-in-thoracic-and-lumbar-spine-instrumentation-using-navigation-based-on-an-intraoperative-cone-beam-ct-imaging-system-a-prospective-randomized-clinical-trial
#1
Nathalie Pireau, Virginie Cordemans, Xavier Banse, Nadia Irda, Sébastien Lichtherte, Ludovic Kaminski
PURPOSE: Spine surgery still remains a challenge for every spine surgeon, aware of the potential serious outcomes of misplaced instrumentation. Though many studies have highlighted that using intraoperative cone beam CT imaging and navigation systems provides higher accuracy than conventional freehand methods for placement of pedicle screws in spine surgery, few studies are concerned about how to reduce radiation exposure for patients with the use of such technology. One of the main focuses of this study is based on the ALARA principle (as low as reasonably achievable)...
July 22, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28733037/efficient-probabilistic-finite-element-analysis-of-a-lumbar-motion-segment
#2
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/28730548/orthopedic-infections-caused-by-obligatory-anaerobic-gram-negative-rods-report-of-two-cases
#3
Marta Kierzkowska, Piotr Pedzisz, Ireneusz Babiak, Jakub Janowicz, Mateusz Kulig, Anna Majewska, Anna Sawicka-Grzelak, Grazyna Mlynarczyk
Anaerobic bone and joint infections are uncommon, although the number of anaerobic infections is presumably underestimated because of difficulties with isolation and identification of obligate anaerobes. This study describes two cases of complicated Bacteroides fragilis peri-implant infection of the lumbar spine, infection of the hip and osteomyelitis. Bacteria were identified with the use of a mass spectrometer, VITEK MS system. Drug susceptibility was performed with the use of E-test. The EUCAST breakpoints were used for interpretation with B...
July 20, 2017: Medical Microbiology and Immunology
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/28705591/effectiveness-of-surgery-versus-conservative-treatment-for-lumbar-spinal-stenosis-a-system-review-and-meta-analysis-of-randomized-controlled-trials
#5
REVIEW
Xin-Long Ma, Xing-Wen Zhao, Jian-Xiong Ma, Fei Li, Yin Wang, Bin Lu
PURPOSE: Lumbar spinal stenosis (LSS) was a common degenerative disease that affected the lumbar spine function and quality of life, which can be treated both surgery and conservative treatment. We did this study to compare the effectiveness of surgery versus conservative treatment for LSS. METHODS: We searched PubMed as well as other databases in September.18th.2016. Randomized controlled trials compared surgery versus conservative treatment for patients with LSS were enrolled...
July 10, 2017: International Journal of Surgery
https://www.readbyqxmd.com/read/28697947/synaptic-distribution-and-plasticity-in-primary-auditory-cortex-a1-exhibits-laminar-and-cell-specific-changes-in-the-deaf
#6
H Ruth Clemo, Stephen G Lomber, M Alex Meredith
The processing sequence through primary auditory cortex (A1) is impaired by deafness as evidenced by reduced neuronal activation in A1 of cochlear-implanted deaf cats. Such a loss of neuronal excitation should be manifest as changes in excitatory synaptic number and/or size, for which the post-synaptic correlate is the dendritic spine. Therefore, the present study sought evidence for this functional disruption using Golgi-Cox/light microscopic techniques that examined spine-bearing neurons and their dendritic spine features across all laminae in A1 of early-deaf (ototoxic lesion <1 month; raised into adulthood >16 months) and hearing cats...
July 1, 2017: Hearing Research
https://www.readbyqxmd.com/read/28684347/the-adult-deformity-surgery-complexity-index-adsci-a-valid-tool-to-quantify-the-complexity-of-posterior-adult-spinal-deformity-surgery-and-predict-postoperative-complications
#7
Ferran Pellisé, Alba Vila-Casademunt, Susana Núñez-Pereira, Montse Domingo-Sàbat, Juan Bagó, Xavier Vidal, Ahmet Alanay, Emre Acaroglu, Frank Kleinstück, Ibrahim Obeid, Francisco J S Pérez-Grueso, Virginie Lafage, Shay Bess, Christopher Ames, Anne F Mannion
BACKGROUND CONTEXT: In 2008, Mirza et al. designed and validated the first and only index capable of quantifying the complexity of spine surgery. However, this index is not fully applicable to adult spinal deformity (ASD) surgery, since it does not include the surgical techniques most commonly used and most strongly associated with perioperative complications in ASD patients. PURPOSE: The objective of this study is to develop an "Adult Deformity Surgery Complexity Index" (ADSCI), to quantify objectively the complexity of the ASD posterior surgery...
July 3, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28682906/one-stage-surgical-treatment-of-cervical-spine-fracture-dislocation-in-patients-with-ankylosing-spondylitis-via-the-combined-anterior-posterior-approach
#8
Axiang He, Dong Xie, Xiaomin Cai, Bo Qu, Qin Kong, Chenhui Xu, Lili Yang, Xiongsheng Chen, Lianshun Jia
The aim of the article is to investigate the efficacy and safety of 1-stage surgical therapy via combined anterior-posterior approach on cervical spine fracture in patients with ankylosing spondylitis (AS).We retrospectively analyzed profiles of 12 AS patients with severe fracture-dislocation of cervical spine received 1-stage combined anterior-posterior surgery in our hospital from October, 2013, to October, 2015, including clinical characteristics, follow-up data, and imaging records. We compared the parameters before and after surgery on the basis of neurological function, bone fusion, Cobb angles of operation segment, Barthel index (BI) score, and incidence rate of complications...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28676980/clinical-and-radiological-outcome-at-10-years-of-follow-up-after-total-cervical-disc-replacement
#9
Christoph Mehren, Franziska Heider, Christoph J Siepe, Bernhard Zillner, Ralph Kothe, Andreas Korge, H Michael Mayer
PURPOSE: Previous studies have demonstrated that total cervical disc replacement (cTDR) represents a viable treatment alternative to the 'gold standard' anterior cervical discectomy and fusion for the treatment of well-defined cervical pathologies at short- and mid-term follow-up (FU). However, the implementation and acceptance of a non-fusion philosophy is closely associated with its avoidance of adjacent segment degeneration. Proof of the functional sustainability and clinical improvement of symptoms at long-term FU is still pending...
July 4, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28676766/site-specific-variations-in-bone-mineral-density-under-systemic-conditions-inducing-osteoporosis-in-minipigs
#10
Matthias C Schulz, Jan Kowald, Sven Estenfelder, Roland Jung, Eberhard Kuhlisch, Uwe Eckelt, Ronald Mai, Lorenz C Hofbauer, Christian Stroszczynski, Bernd Stadlinger
Osteoporosis is a systemic bone disease with an increasing prevalence in the elderly population. There is conflicting opinion about whether osteoporosis affects the alveolar bone of the jaws and whether it poses a risk to the osseointegration of dental implants. The aim of the present study was to evaluate the effects of systemic glucocorticoid administration on the jaw bone density of minipigs. Thirty-seven adult female minipigs were randomly divided into two groups. Quantitative computed tomography (QCT) was used to assess bone mineral density BMD of the lumbar spine as well as the mandible and maxilla, and blood was drawn...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28668408/metal-artifact-reduction-by-dual-layer-computed-tomography-using-virtual-monoenergetic-images
#11
Victor Neuhaus, Nils Große Hokamp, Nuran Abdullayev, Robert Rau, Anastasios Mpotsaris, David Maintz, Jan Borggrefe
OBJECTIVE: The aim of the study was to investigate the performance and diagnostic value of metal artifact reduction in virtual monoenergetic images generated from dual-layer computed tomography (DLCT). METHODS: 35 patients that received a DLCT at the University Hospital Cologne and had an orthopedic implant in the examined region were included in this study. For each DLCT virtual monoenergetic images of different energy levels (64keV, 70keV, 105keV, 140keV, 200keV and an optimized photon energy) were reconstructed and analyzed by three blinded observers...
August 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28660437/optimization-of-technique-for-insertion-of-implants-at-the-supra-acetabular-corridor-in-pelvis-and-acetabular-surgery
#12
Theodoros H Tosounidis, Cyril Mauffrey, Peter V Giannoudis
The technique for application of implants at the sciatic buttress has been well described in the pelvic and acetabular fracture reconstruction literature. We described a new use of the inlet-obturator oblique view for the identification of the anterior inferior iliac spine, which is the entry point of implants, and we provide a detailed fluoroscopic and radiographic description of this view. A small series of 15 patients who underwent an application of an anterior inferior pelvic external (supra-acetabular) fixator via this technique is presented...
June 28, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28658870/failed-back-surgery-syndrome-evaluation-with-magnetic-resonance-imaging
#13
Peeyush Kumar Dhagat, Megha Jain, Satyendra Narayan Singh, Sumeet Arora, Kasukarthi Leelakanth
INTRODUCTION: Failed Back Surgery Syndrome (FBSS) is a generalized term used to describe varied spinal symptoms of patients who have had unsuccessful results after spinal surgery. The treatment of FBSS is challenging and varies from conservative management to reoperation. Imaging plays a crucial role in identifying the cause and helps to guide the appropriate therapy. Contrast enhanced Magnetic Resonance Imaging (MRI) with its superior resolution is the imaging modality of choice. AIM: To evaluate the spectrum of imaging findings on postoperative MRI in FBSS...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28658132/emergency-1-stage-anterior-approach-for-cervical-spine-infection-complicated-by-epidural-abscess
#14
Haoxi Li, Zhaoxiong Chen, Zhiyao Yong, Xinhua Li, Yufeng Huang, Desheng Wu
It was a retrospective analysis.The aim of the study was to explore the safety and reliability of emergency 1-stage radical debridement and reconstruction using titanium mesh filled with autologous bone for patients with cervical spine infection complicated by epidural abscess.At present, cervical spine infection complicated by epidural abscess is known as a severe spine disease. Recently, case report of this disease is showing quite an increasing tendency, particularly in economically undeveloped areas and countries...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28658032/assessment-of-the-change-in-alignment-of-fixed-segment-after-adult-spinal-deformity-surgery
#15
Tomohiro Banno, Tomohiko Hasegawa, Yu Yamato, Sho Kobayashi, Daisuke Togawa, Go Yoshida, Tatsuya Yasuda, Shin Oe, Yuki Mihara, Hiroki Ushirozako, Yukihiro Matsuyama
STUDY DESIGN: Retrospective study OBJECTIVE.: To determine the prevalence of loss in fixed segment alignment after surgical correction of adult spinal deformity (ASD) and identify associated risk factors. SUMMARY OF BACKGROUND DATA: Altered fixed segment alignment influences global spinal alignment; however, associated risk factors have not been determined. METHODS: Data of 63 patients with ASD (55 women; mean age, 68.0 years), who underwent corrective fusion from the lower thoracic spine to the pelvis and completed the 2-year follow-up, were retrospectively analyzed...
June 27, 2017: Spine
https://www.readbyqxmd.com/read/28657157/cyberknife-with-integrated-ct-on-rails-system-description-and-first-clinical-application-for-pancreas-sbrt
#16
Chrysi Papalazarou, Gijsbert J Klop, Maaike T W Milder, Johannes P A Marijnissen, Vikas Gupta, Ben J M Heijmen, Joost J M E Nuyttens, Mischa S Hoogeman
PURPOSE: This paper reports on the integration of a sliding-gantry CT-on-rails with a robotic linear accelerator. METHODS: The system consists of a SOMATOM Definition AS CT scanner (Siemens Healthcare, Forchheim, Germany) and a CyberKnife M6 FIM (Accuray, Inc., Sunnyvale, CA, USA). Additional movement programs were implemented in the robotic treatment table (RoboCouch, Accuray Inc.) to move between CT and treatment position. Acceptance testing was performed on the CT scanner according to AAPM83 guidelines, as well as safety tests for collision avoidance and electromagnetic (EM) compatibility...
June 28, 2017: Medical Physics
https://www.readbyqxmd.com/read/28637120/is-tutobone-an-efficient-alternative-to-other-implants-used-in-anterior-cervical-discectomy-and-fusion-surgeries
#17
Savithru Kumar Prakash, Nitin Mukerji, Fredrik Prem Nath
BACKGROUND: The graft site morbidity following iliac crest harvesting is significant. To overcome this, different bone substitutes like coral dowels, solvent dissolved bovine/human bone substitutes, and carbon fiber/titanium cages have been used. This study was undertaken to assess the postoperative radiological fusion rates and symptom relief in patients who had Tutobone used as an interbody spacer compared to autologous bone graft (ABG), cages, surgibone and coral dowels. METHODS: This was a retrospective, observational study...
March 6, 2017: British Journal of Neurosurgery
https://www.readbyqxmd.com/read/28632563/why-lumbar-artificial-disk-replacements-ladrs-fail
#18
Kenneth Pettine, Robert Ryu, Fernando Techy
STUDY DESIGN: A retrospective review of prospectively collected data. OBJECTIVE: To determine why artificial disk replacements (ADRs) fail by examining results of 91 patients in FDA studies performed at a single investigational device exemption (IDE) site with minimum 2-year follow-up. SUMMARY OF BACKGROUND DATA: Patients following lumbar ADR generally achieve their 24-month follow-up results at 3 months postoperatively. MATERIALS AND METHODS: Every patient undergoing ADR at 1 IDE site by 2 surgeons was evaluated for clinical success...
July 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28631069/-s2-ala-iliac-screws-for-extended-pelvic-fixation-in-longer-lumbar-instrumentations-description-of-a-freehand-technique
#19
REVIEW
F Lattig, S Weckbach
OBJECTIVE: To reduce the rate of implant failures at the lumbosacral junction in polysegmental lumbar fusions. INDICATIONS: Spinal fusion with deformity correction including L5/S1, revision surgery for pseudoarthrosis L5/S1, screw pull-out and pedicle fractures in S1, and S1/S2 fractures after polysegmental fusions. CONTRAINDICATIONS: Osteosynthesis of complex pelvic ring fractures, tumors of the ilium. Relative contraindication: infection, to avoid contamination of the iliosacral joint...
June 19, 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28630851/vacuum-assisted-closure-in-patients-with-post-operative-infections-after-instrumented-spine-surgery-a-series-of-12-cases
#20
Maya Kale, Pravin Padalkar, Varshil Mehta
INTRODUCTION: Post-operative wound infections after spinal surgery is a very serious problem, leading to a risk of significant morbidity which may even lead to prolonged hospitalization. Various treatment protocols have been recommended for debridement, antibiotic, and soft-tissue management, but with mixed results. However, the risk of morbidity is still high with these treatment options. Vacuum-assisted closure (VAC) system has been gaining popularity recently in the management of subacute, acute, and chronic wounds...
January 2017: Journal of Orthopaedic Case Reports
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