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Lumbar instrumentation

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https://www.readbyqxmd.com/read/28810871/effect-of-different-inner-core-diameters-on-structural-strength-of-cannulated-pedicle-screws-under-various-lumbar-spine-movements
#1
Chia-Ming Chang, Yu-Shu Lai, Cheng-Kung Cheng
BACKGROUND: Currently, cannulated pedicle screws have been widely used in minimal invasive or navigation techniques. However, the stress distribution and the strength of different core diameters of cannulated screw are not clear. This study aimed to investigate the mechanical strength of cannulated screws with different inner core diameter under various lumbar spine movements using finite element analysis. RESULTS: The results showed that the von-Mises stress of a cannulated screw was larger than that of a solid screw in all loading conditions, especially above 2 mm in cannulated core diameter...
August 15, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28808602/high-lumbar-noninstrumented-fusion-rates-using-lamina-autograft-and-nanoss-bone-marrow-aspirate
#2
Nancy E Epstein
BACKGROUND: Patients with marked osteoporosis and/or obesity/morbid obesity and severe multilevel lumbar stenosis and other pathology often undergo multilevel laminectomies with non instrumented posterolateral fusions (PLF). The other pathology may include combinations of degenerative spondylolisthesis/lysis, foraminal/far lateral discs, and/or synovial cysts requiring more extensive facet resections. Presently, spine surgeons often use bone graft expanders to supplement the lamina autograft harvested in the course of laminectomy/decompressions for the PLF mass...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28807742/a-cost-utility-analysis-of-dynesys-dynamic-stabilization-versus-instrumented-fusion-for-the-treatment-of-degenerative-lumbar-spine-diseases
#3
Kan Liu, Wei Sun, Qiang Lu, Jiying Chen, Jiaguang Tang
BACKGROUND: Symptomatic chronic low back and leg pain resulting from lumbar spine degenerative disorders is highly prevalent in China, and for some patients, surgery is the final option for improvement. Several techniques for spinal non-fusion have been introduced to reduce the side-effects of fusion methods and hasten postoperative recovery. In this study, the authors have evaluated the cost-effectiveness of Dynesys posterior dynamic stabilization system (DY) compared with lumbar fusion techniques in the treatment of single-level degenerative lumbar spinal conditions...
August 11, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28801863/pedicle-screw-fixation-in-thoracolumbar-and-lumbar-spine-assisted-by-lateral-fluoroscopic-imaging-a-study-to-evaluate-the-accuracy-of-screw-placement
#4
S P Mohanty, S N Bhat, M Pai Kanhangad, G S Gosal
BACKGROUND: The purpose of this study was to evaluate the accuracy of pedicle screw placement, its advantages, and limitations in posterior instrumentation of thoracolumbar and lumbar burst fractures assisted only by lateral fluoroscopic imaging. MATERIALS AND METHODS: Pre- and postoperative computerized tomographic (CT) scans of 117 patients with thoracolumbar and lumbar burst fractures, who underwent posterior instrumentation with pedicle screw fixation, were prospectively analyzed...
August 11, 2017: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/28800573/lumbar-degenerative-spondylolisthesis-changes-in-surgical-indications-and-comparison-of-instrumented-fusion-with-two-surgical-decompression-procedures-erratum
#5
(no author information available yet)
No abstract text is available yet for this article.
August 15, 2017: Spine
https://www.readbyqxmd.com/read/28777023/impact-of-neurosurgeon-specialization-on-patient-outcomes-for-intracranial-and-spinal-surgery-a-retrospective-analysis-of-the-nationwide-inpatient-sample-1998-2009
#6
Brandon A McCutcheon, Brian R Hirshman, Brandon C Gabel, Michael W Heffner, Logan P Marcus, Tyler S Cole, Clark C Chen, David C Chang, Bob S Carter
OBJECTIVE The subspecialization of neurosurgical practice is an ongoing trend in modern neurosurgery. However, it remains unclear whether the degree of surgeon specialization is associated with improved patient outcomes. The authors hypothesized that a trend toward increased neurosurgeon specialization was associated with improved patient morbidity and mortality rates. METHODS The Nationwide Inpatient Sample (NIS) was used (1998-2009). Patients were included in a spinal analysis cohort for instrumented spine surgery involving the cervical spine ( International Classification of Diseases, Ninth Revision, Clinical Modification [ICD-9-CM] codes 81...
August 4, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28770402/kinematic-efficacy-of-supplemental-anterior-lumbar-interbody-fusion-at-lumbosacral-levels-in-thoracolumbosacral-deformity-correction-with-and-without-pedicle-subtraction-osteotomy-at-l3-an-in-vitro-cadaveric-study
#7
Benny T Dahl, Jonathan A Harris, Manasa Gudipally, Mark Moldavsky, Saif Khalil, Brandon S Bucklen
PURPOSE: Pedicle subtraction osteotomy (PSO) is performed to treat rigid, sagittal spinal deformities, but high rates of implant failure are reported. Anterior lumbar interbody fusion has been proposed to reduce this risk, but biomechanical investigation is lacking. The goal of this study was to quantify the (1) destabilizing effects of a lumbar osteotomy and (2) contribution of anterior lumbar interbody fusion (ALIF) at the lumbosacral junction as recommended in literature. METHODS: Fourteen fresh human thoracolumbosacral spines (T12-S1) were tested in flexion-extension (FE), lateral bending (LB), and axial rotation (AR)...
August 2, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28768786/posterior-spinal-fusion-for-adolescent-idiopathic-scoliosis-using-a-convex-pedicle-screw-technique-a-novel-concept-of-deformity-correction
#8
A I Tsirikos, G Mataliotakis, N Bounakis
AIMS: We present the results of correcting a double or triple curve adolescent idiopathic scoliosis using a convex segmental pedicle screw technique. PATIENTS AND METHODS: We reviewed 191 patients with a mean age at surgery of 15 years (11 to 23.3). Pedicle screws were placed at the convexity of each curve. Concave screws were inserted at one or two cephalad levels and two caudal levels. The mean operating time was 183 minutes (132 to 276) and the mean blood loss 0...
August 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/28767629/modic-changes-and-disc-degeneration-of-non-fused-segments-27-to-45-years-after-harrington-instrumentation-for-adolescent-idiopathic-scoliosis-comparison-to-healthy-controls
#9
Tsutomu Akazawa, Toshiaki Kotani, Tsuyoshi Sakuma, Shohei Minami, Sumihisa Orita, Kazuhide Inage, Kazuki Fujimoto, Yasuhiro Shiga, Yoshiaki Torii, Tasuku Umehara, Masahiro Iinuma, Shingo Kuroya, Hisateru Niki, Seiji Ohtori, Kazuhisa Takahashi
STUDY DESIGN: A case control study. OBJECTIVE: To investigate the long-term prevalence of the Modic changes and disc degeneration in the non-fused segments of the surgically treated adolescent idiopathic scoliosis (AIS) patients and compare with age- and sex-matched healthy controls. SUMMARY OF BACKGROUND DATA: No studies have looked at the association between Modic changes and low back pain in patients who underwent AIS surgery many years ago...
August 1, 2017: Spine
https://www.readbyqxmd.com/read/28767626/a-detailed-comparative-analysis-of-anterior-versus-posterior-approach-to-lenke-5c-curves
#10
Firoz Miyanji, Luigi A Nasto, Tracey Bastrom, Amer F Samdani, Burt Yaszay, David Clements, Suken A Shah, Baron Lonner, Randal R Betz, Harry L Shufflebarger, Peter O Newton
STUDY DESIGN: Prospective cohort study OBJECTIVE.: To prospectively compare radiographic, perioperative and functional outcomes between anterior spinal instrumented fusion (ASIF) and posterior spinal instrumented fusion (PSIF) in Lenke 5C curves. SUMMARY OF BACKGROUND DATA: Historically, ASIF has been the treatment of choice for treatment of thoracolumbar adolescent idiopathic scoliosis (AIS). More recently, PSIF has gained popularity for its ease, versatility and amount of correction achieved...
August 1, 2017: Spine
https://www.readbyqxmd.com/read/28765804/integrated-fixation-cage-loosening-under-fatigue-loading
#11
Srinidhi Nagaraja, Vivek Palepu
BACKGROUND: Screw loosening is a well-known adverse event in traditional spinal fusion instrumentation. This phenomenon may hinder segmental stability of the spine leading to bony non-union. In recent years numerous lumbar integrated fixation cages (IFC) have been introduced that offer a low profile alternative to a standard cage with an anterior plate (AP+C). The fixation approach for IFCs is different than a traditional anterior approach; therefore, it is unclear whether IFCs may loosen from the surrounding bone over time...
2017: International Journal of Spine Surgery
https://www.readbyqxmd.com/read/28760035/minimally-invasive-versus-open-fusion-for-grade-i-degenerative-lumbar-spondylolisthesis-analysis-of-the-quality-outcomes-database
#12
Praveen V Mummaneni, Erica F Bisson, Panagiotis Kerezoudis, Steven Glassman, Kevin Foley, Jonathan R Slotkin, Eric Potts, Mark Shaffrey, Christopher I Shaffrey, Domagoj Coric, John Knightly, Paul Park, Kai-Ming Fu, Clinton J Devin, Silky Chotai, Andrew K Chan, Michael Virk, Anthony L Asher, Mohamad Bydon
OBJECTIVE Lumbar spondylolisthesis is a degenerative condition that can be surgically treated with either open or minimally invasive decompression and instrumented fusion. Minimally invasive surgery (MIS) approaches may shorten recovery, reduce blood loss, and minimize soft-tissue damage with resultant reduced postoperative pain and disability. METHODS The authors queried the national, multicenter Quality Outcomes Database (QOD) registry for patients undergoing posterior lumbar fusion between July 2014 and December 2015 for Grade I degenerative spondylolisthesis...
August 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28760032/minimally-invasive-transforaminal-lumbar-interbody-fusion-with-expandable-versus-static-interbody-devices-radiographic-assessment-of-sagittal-segmental-and-pelvic-parameters
#13
Ammar H Hawasli, Jawad M Khalifeh, Ajay Chatrath, Chester K Yarbrough, Wilson Z Ray
OBJECTIVE Minimally invasive transforaminal lumbar interbody fusion (MIS-TLIF) has been adopted as an alternative technique to hasten recovery and minimize postoperative morbidity. Advances in instrumentation technologies and operative techniques have evolved to maximize patient outcomes as well as radiographic results. The development of expandable interbody devices allows a surgeon to perform MIS-TLIF with minimal tissue disruption. However, sagittal segmental and pelvic radiographic outcomes after MIS-TLIF with expandable interbody devices are not well characterized...
August 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28760028/correction-of-severe-spinopelvic-mismatch-decreased-blood-loss-with-lateral-hyperlordotic-interbody-grafts-as-compared-with-pedicle-subtraction-osteotomy
#14
Jean-Christophe Leveque, Vijay Yanamadala, Quinlan D Buchlak, Rajiv K Sethi
OBJECTIVE Pedicle subtraction osteotomy (PSO) provides extensive correction in patients with fixed sagittal plane imbalance but is associated with high estimated blood loss (EBL). Anterior column realignment (ACR) with lateral graft placement and sectioning of the anterior longitudinal ligament allows restoration of lumbar lordosis (LL). The authors compare peri- and postoperative measures in 2 groups of patients undergoing correction of a sagittal plane imbalance, either through PSO or the use of lateral lumbar fusion and ACR with hyperlordotic (20°-30°) interbody cages, with stabilization through standard posterior instrumentation in all cases...
August 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28751241/flexibility-assessment-of-the-unfused-thoracic-segments-above-the-potential-upper-instrumented-vertebra-using-the-supine-side-bending-radiographs-in-lenke-5-and-6-curves-for-adolescent-idiopathic-scoliosis-patients
#15
Mun Keong Kwan, Chee Kidd Chiu, Teik Seng Chan, Siti Mariam Abd Gani, Tan Shurn Heng, Chris Yin Wei Chan
BACKGROUND CONTEXT: Selection of UIV for Lenke 5 and 6 curves remains debatable, and several authors had described different selection strategies. OBJECTIVE: This study analyzed the flexibility of the unfused thoracic segments above the 'potential upper instrumented vertebrae (UIV)' (T1 to T12) and its compensatory ability in Lenke 5 and 6 curves using supine side bending (SSB) radiographs. STUDY DESIGN: Retrospective study PATIENT SAMPLE: 100 patients OUTCOME MEASURES: The ability of the unfused thoracic segments above the 'potential upper instrumented vertebrae (UIV)' i...
July 24, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28746140/are-there-3d-changes-in-spine-and-rod-shape-in-the-2-years-after-adolescent-idiopathic-scoliosis-instrumentation
#16
Franck Le Navéaux, Hubert Labelle, Stefan Parent, Peter O Newton, Carl-Eric Aubin
STUDY DESIGN: Retrospective analysis of spine and rods 3D shape in the 2 years after adolescent idiopathic scoliosis (AIS) posterior surgical instrumentation. OBJECTIVE: To evaluate spine and rod shape 3D changes in the 2 years after AIS instrumentation with different rod materials. SUMMARY OF BACKGROUND DATA: Postoperative loss of correction has been reported with modern segmental instrumentation. The postoperative 3D rod shape changes of different rod materials and their implication in postoperative loss of correction have never been studied...
August 1, 2017: Spine
https://www.readbyqxmd.com/read/28746132/three-dimensional-cross-platform-planning-for-complex-spinal-procedures-a-new-method-adaptive-to-different-navigation-systems
#17
Michael Kosterhon, Angelika Gutenberg, Sven R Kantelhardt, Jens Conrad, Amr Nimer Amr, Joachim Gawehn, Alf Giese
STUDY DESIGN: A feasibility study. OBJECTIVE: To develop a method based on the DICOM standard which transfers complex 3-dimensional (3D) trajectories and objects from external planning software to any navigation system for planning and intraoperative guidance of complex spinal procedures. SUMMARY OF BACKGROUND DATA: There have been many reports about navigation systems with embedded planning solutions but only few on how to transfer planning data generated in external software...
August 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28743671/impact-of-gender-disparities-on-short-and-long-term-patient-reported-outcomes-and-satisfaction-measures-after-elective-lumbar-spine-surgery-a-single-institutional-study-of-384-patients
#18
Aladine A Elsamadicy, Gireesh B Reddy, Gautum Nayer, Amanda Sergesketter, Rasheedat Zakare-Fagbamila, Isaac O Karikari, Oren N Gottfried
BACKGROUND: There is a paucity of data determining the impact that gender disparities have on spine outcomes, particularly perception of health and satisfaction. The aim of this study was to determine whether there is a difference in three-month and one-year PROs and satisfaction after elective lumbar-spine surgery. METHODS: This was a retrospectively analyzed study from a maintained prospective database of 384 patients who underwent elective lumbar-spine surgery...
July 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28741218/asymmetric-pedicle-subtractionosteotomy-apso-guided-by-a-3d-printed-model-to-correct-a-combined-fixed-sagittal-and-coronal-imbalance
#19
Pierre-Pascal Girod, S Hartmann, P Kavakebi, J Obernauer, M Verius, C Thomé
Surgical correction of fixed thoracolumbar deformity is usually achieved by estimating the preoperatively planned correction angles during surgery and is therefore prone to inaccuracy. This is particularly problematic in biplanar deformities. To overcome these difficulties, 3D model for planning, preparation, and simulation of an asymmetric pedicle subtraction osteotomy (aPSO) was printed and used to realign coronal and sagittal balance in case of rigid degenerative kyphoscoliosis. A 59-year-old woman presented with severe back pain and spinal claudication and was diagnosed with a rigid kyphoscoliosis with multilevel spinal stenosis...
July 24, 2017: Neurosurgical Review
https://www.readbyqxmd.com/read/28741148/simultaneous-navigated-cervico-thoracic-and-thoraco-lumbar-fixation
#20
Krunal Patel, Tamara Tajsic, Karol P Budohoski, Mathew R Guilfoyle, Rikin A Trivedi
STUDY DESIGN: Case report. OBJECTIVE: To investigate the feasibility of using two independent image guidance systems to simultaneously fix multiple segment spine fractures. Image guidance is increasingly used to aid spinal fixation. We describe the first use of multiple navigation systems during a single procedure allowing for multi-segment spinal fixations to be performed simultaneously and capitalizing the advantages of navigation. METHOD: Two Medtronic Stealth Station S7™ systems with O-arm image capture were used to guide fixation of C6 and T12, unstable, AO A4, three-column fractures, in a patient with ankylosing spondylitis...
July 24, 2017: European Spine Journal
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