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https://www.readbyqxmd.com/read/28342975/biomechanical-testing-of-a-peek-based-dynamic-instrumentation-device-in-a-lumbar-spine-model
#1
Christian Herren, Agnes Beckmann, Sabine Meyer, Miguel Pishnamaz, Marion Mundt, Rolf Sobottke, Andreas Prescher, Marcus Stoffel, Bernd Markert, Philipp Kobbe, Hans-Christoph Pape, Peer Eysel, Jan Siewe
BACKGROUND: The purpose of this study was to investigate the range-of-motion after posterior polyetheretherketone-based rod stabilisation combined with a dynamic silicone hinge in order to compare it with titanium rigid stabilisation. METHODS: Five human cadaveric lumbar spines with four vertebra each (L2 to L5) were tested in a temperature adjustable spine-testing set-up in four trials: (1) native measurement; (2) kinematics after rigid monosegmental titanium rod instrumentation with anterior intervertebral bracing of the segment L4/5; (3) kinematics after hybrid posterior polyetheretherketone rod instrumentation combined with a silicone hinge within the adjacent level (L3/4) and (4) kinematics after additional decompression with laminectomy of L4 and bilateral resection of the inferior articular processes (L3)...
March 18, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28332593/injections-through-skin-colonized-with-staphylococcus-aureus-biofilm-introduce-contamination-despite-standard-antimicrobial-preparation-procedures
#2
Yi Wang, Valery Leng, Viraj Patel, K Scott Phillips
While surgical site preparation has been extensively studied, there is little information about resistance of skin microbiota in the biofilm form to antimicrobial decontamination, and there are no quantitative models to study how biofilm might be transferred into sterile tissue/implant materials during injections for joint spine and tendon, aspiration biopsies and dermal fillers (DF). In this work, we develop two in vitro models to simulate the process of skin preparation and DF injection using pig skin and SimSkin (silicone) materials, respectively...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28328563/patients-without-intraoperative-neuromonitoring-ionm-alerts-during-veptr-implantation-did-not-sustain-neurological-injury-during-subsequent-routine-expansions-a-retrospective-multicenter-cohort-study
#3
Jaren LaGreca, Tara Flynn, Patrick J Cahill, Amer Samdani, Michael G Vitale, Ron El-Hawary, John T Smith, Jonathan H Phillips, John M Flynn, Michael Glotzbecker, Sumeet Garg
BACKGROUND: The purpose of this study was to determine the rate of intraoperative neurological monitoring (IONM) alerts and neurological injury during vertical expandable prosthetic titanium rib (VEPTR) treatment and evaluate the utility of IONM during VEPTR expansion procedures in patients who have not previously had neurological injury or IONM alerts. METHODS: After institutional review board approval, VEPTR procedures and IONM records were reviewed at 17 institutions for patients treated with VEPTR from 2005 to 2011...
March 21, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28324865/biomaterials-for-intervertebral-disc-regeneration-and-repair
#4
REVIEW
Robert D Bowles, Lori A Setton
The intervertebral disc contributes to motion, weight bearing, and flexibility of the spine, but is susceptible to damage and morphological changes that contribute to pathology with age and injury. Engineering strategies that rely upon synthetic materials or composite implants that do not interface with the biological components of the disc have not met with widespread use or desirable outcomes in the treatment of intervertebral disc pathology. Here we review bioengineering advances to treat disc disorders, using cell-supplemented materials, or acellular, biologically based materials, that provide opportunity for cell-material interactions and remodeling in the treatment of intervertebral disc disorders...
March 15, 2017: Biomaterials
https://www.readbyqxmd.com/read/28324184/early-outcomes-of-spinal-growth-tethering-for-idiopathic-scoliosis-with-a-novel-device-a-prospective-study-with-2-years-of-follow-up
#5
M Boudissa, A Eid, E Bourgeois, J Griffet, A Courvoisier
QUESTIONS/PURPOSES: Adolescent idiopathic scoliosis is a 3D spine deformity that worsens during the whole growth. New methods for spinal growth modulation with flexible spinal implants have been described to avoid progression of the deformity during growth spurt. The main limitations are that no specific ancillaries and devices are available, which makes the surgery technically demanding. METHODS: We have developed a new method of spinal growth tethering using minimal invasive videothoracoscopic approach...
March 21, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28323709/single-stage-transpedicular-vertebrectomy-and-expandable-cage-placement-for-treatment-of-unstable-mid-and-lower-lumbar-burst-fractures
#6
Jong-Il Choi, Bum-Joon Kim, Sung-Kon Ha, Sang-Dae Kim, Dong-Jun Lim, Se-Hoon Kim
STUDY DESIGN: Retrospective clinical and radiographic study. OBJECTIVE: To examine the efficacy and safety of vertebrectomy and expandable cage placement by a single-stage posterior approach for unstable mid and lower lumbar burst fractures (below the L3). SUMMARY OF BACKGROUND DATA: Patients with unstable mid and lower lumbar burst fractures require surgical treatment to relieve pain, address paralysis, and stabilize the spine to prevent further segmental deformity...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28322477/impact-of-insurance-provider-on-overall-costs-in-failed-back-surgery-syndrome-a-cost-study-of-122-827-patients
#7
Aladine A Elsamadicy, Samuel Harrison Farber, Siyun Yang, Syed Mohammed Qasim Hussaini, Kelly R Murphy, Amanda Sergesketter, Carter M Suryadevara, Promila Pagadala, Beth Parente, Jichun Xie, Shivanand P Lad
OBJECTIVES: Failed back surgery syndrome (FBSS) affects 40% of patients following spine surgery with estimated costs of $20 billion to the US health care system. The aim of this study was to assess the cost differences across the different insurance providers for FBSS patients. METHODS: A retrospective longitudinal study was performed using the Truven MarketScan(®) database to identify FBSS patients from 2001 to 2012. Patients were grouped into Commercial, Medicaid, or Medicare cohorts...
March 21, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28316056/temporary-stabilization-of-unstable-spine-fractures
#8
REVIEW
Aaron P Danison, Darrin J Lee, Ripul R Panchal
PURPOSE OF REVIEW: We will review the recent literature concerning the necessity of supplemental fusion to spinal instrumentation and discuss if temporal spinal fixation is a viable option for the treatment of unstable spine fractures. Advancements in minimally invasive techniques offer an alternative approach to traditional open stabilization for unstable spine fractures. The use of minimally invasive surgery offers many advantages concerning operative morbidly; fusion is not utilized and instrumentation can be removed in a delayed fashion...
March 18, 2017: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/28286524/mesenchymal-stem-cells-for-the-treatment-of-spinal-arthrodesis-from-preclinical-research-to-clinical-scenario
#9
REVIEW
F Salamanna, M Sartori, G Barbanti Brodano, C Griffoni, L Martini, S Boriani, M Fini
The use of spinal fusion procedures has rapidly augmented over the last decades and although autogenous bone graft is the "gold standard" for these procedures, alternatives to its use have been investigated over many years. A number of emerging strategies as well as tissue engineering with mesenchymal stem cells (MSCs) have been planned to enhance spinal fusion rate. This descriptive systematic literature review summarizes the in vivo studies, dealing with the use of MSCs in spinal arthrodesis surgery and the state of the art in clinical applications...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28286279/management-of-esophageal-and-pharyngeal-perforation-as-complications-of-anterior-cervical-spine-surgery
#10
Moo Sung Kang, Kyung Hyun Kim, Jeong Yoon Park, Sung Uk Kuh, Dong Kyu Chin, Byung Ho Jin, Keun Su Kim, Yong Eun Cho
OBJECTIVE: To describe our experience in treating esophageal and pharyngeal perforation after anterior cervical spine surgery. METHODS: Six patients with esophageal injury and one patient with pharyngeal injury after anterior cervical spinal surgery, managed at our department between 2000 and 2015, were retrospectively analyzed. RESULTS: During the study period, seven patients (six male and one female; mean age, 45 years) presented with esophageal perforation...
March 9, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28281004/selective-hemivertebrae-resection-in-a-congenital-scoliosis-patient-with-multiple-hemivertebrae-deformities
#11
Yangpu Zhang, Jincai Yang, Lijin Zhou, Aixing Pan, Yong Hai
PURPOSE: To report the surgical experience of selective hemivertebrae resection for a case of congenital scoliosis with multiple hemivertebrae deformities. METHODS: A 14-year-old male presented with progressive rib hump, tilted torso and spine deformity was admitted in our department. No abnormalities were detected in neurological examination and the comprehensive imaging study demonstrated congenital scoliosis of multiple hemivertebrae in T5, T10, L1 and L3. Treatment of the patient commenced with a 10-day skin traction therapy prior to the surgery...
March 9, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28276193/assessment-of-corrosion-in-retrieved-spine-implants
#12
V C Panagiotopoulou, H S Hothi, H A Anwar, S Molloy, H Noordeen, K Rezajooi, J Sutcliffe, J A Skinner, A J Hart
Recently the use of dissimilar metals in spine instrumentation has increased, especially in the case of adult deformities, where rods made from Cobalt Chrome alloys (CoCr) are used with Titanium (Ti) screws. The use of dissimilar metals increases the risk of galvanic corrosion and patients have required revision spine surgery due to severe metallosis that may have been caused by corrosion. We aimed to assess the presence of corrosion in spine implant retrievals from constructs with two types of material combinations: similar (Ti/Ti) and dissimilar (CoCr/Ti)...
March 9, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28268411/automatic-lumbar-vertebrae-detection-based-on-feature-fusion-deep-learning-for-partial-occluded-c-arm-x-ray-images
#13
Yang Li, Wei Liang, Yinlong Zhang, Haibo An, Jindong Tan
Automatic and accurate lumbar vertebrae detection is an essential step of image-guided minimally invasive spine surgery (IG-MISS). However, traditional methods still require human intervention due to the similarity of vertebrae, abnormal pathological conditions and uncertain imaging angle. In this paper, we present a novel convolutional neural network (CNN) model to automatically detect lumbar vertebrae for C-arm X-ray images. Training data is augmented by DRR and automatic segmentation of ROI is able to reduce the computational complexity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28266756/high-frequency-spinal-cord-stimulation-in-surgery-na%C3%A3-ve-patients-a-prospective-single-center-study
#14
Sebastian A Ahmadi, Jan Vesper, Stefan Schu, Philipp J Slotty
INTRODUCTION: A multitude of evidence supporting the beneficial effects of spinal cord stimulation (SCS) in patients suffering from chronic pain syndromes following spinal surgery has been published in the last decade. Evidence is scarce, however, for the use of high frequency SCS (HF-SCS) in the treatment of surgery naïve patients suffering from lower back pain (LBP). METHODS: From June 2014 to April 2015, we prospectively enrolled patients suffering from LBP alone or in conjunction with leg pain in a trial of HF-SCS...
March 7, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28261429/radiological-parameters-of-undegenerated-cervical-vertebral-segments-in-a-korean-population
#15
Sung Hoon Choi, HeeSang Lee, Jae Hwan Cho, Jin Il Jung, Dong-Ho Lee
BACKGROUND: Several scoring systems for cervical disc and facet joint degeneration, using radiography or computed tomography, have been developed and tested for reliability. However, definitions of disc height and facet joint space narrowing vary. To our knowledge, no study has reported quantitative data for normal radiologic values of the cervical spine in the Korean population. The purpose of this study is to determine normal cervical disc height, disc height ratio, and facet joint space values, and investigate the correlation between demographic data and these values...
March 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28261427/causes-of-aseptic-persistent-pain-after-total-knee-arthroplasty
#16
Hong-An Lim, Eun-Kyoo Song, Jong-Keun Seon, Kyung-Soon Park, Young-Joo Shin, Hong-Yeol Yang
BACKGROUND: Persistent pain after total knee arthroplasty (TKA) is dissatisfying to the patient and frustrating to the surgeon. The purpose of this study is to evaluate the aseptic causes and clinical course of intractable pain following TKA. METHODS: Of the total 2,534 cases of primary TKA reviewed, 178 cases were classified as having aseptic persistent pain that was not resolved within 1 year after surgery. Except for the cases with periprosthetic fracture (56 knees), 122 cases of aseptic painful TKA were divided into two groups: intra-articular group (83 knees) and extra-articular group (39 knees)...
March 2017: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/28260125/pull-out-strength-of-patient-specific-template-guided-vs-free-hand-fluoroscopically-controlled-thoracolumbar-pedicle-screws-a-biomechanical-analysis-of-a-randomized-cadaveric-study
#17
A Aichmair, M Moser, M R Bauer, E Bachmann, J G Snedeker, M Betz, M Farshad
PURPOSE: To assess the pull-out strength of thoracolumbar pedicle screws implanted via either a patient-specific template-guided or conventional free-hand fluoroscopically controlled technique in a randomized cadaveric study, and to evaluate the influence of local vertebral bone density, quantified by Hounsfield units (HU), on pedicle screw pull-out strength. METHODS: Thoracolumbar pedicles of three spine cadavers were instrumented using either a free-hand fluoroscopically controlled or a patient-specific template-guided technique...
March 4, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28258287/-trisegmental-fusion-by-vertebral-body-replacement-outcome-following-traumatic-multisegmental-fractures-of-the-thoracic-and-lumbar-spine
#18
Michael Kreinest, Dorothee Schmahl, Paul A Grützner, Stefan Matschke
BACKGROUND: Around 5% of all trauma patients suffer from spinal trauma. Spinal fractures are mainly located in the thoracic and lumbar spine. For multisegmental vertebral fractures categorized as instable, combined dorsal instrumentation and ventral stabilization is recommended. Numerous vertebral body replacement systems are available for ventral stabilization. OBJECTIVES: The aim of the current study was to analyze radiological results following the implantation of a hydraulic expandable vertebral body replacement and the evaluation of patients' outcome three years after implantation...
March 3, 2017: Der Unfallchirurg
https://www.readbyqxmd.com/read/28254672/is-the-use-of-minimally-invasive-fusion-technologies-associated-with-improved-outcomes-after-elective-interbody-lumbar-fusion-analysis-of-a-nationwide-prospective-patient-reported-outcomes-registry
#19
Matthew J McGirt, Scott L Parker, Praveen Mummaneni, John Knightly, Deborah Pfortmiller, Kevin Foley, Anthony L Asher
BACKGROUND CONTEXT: Over the last decade, clinical investigators and biomedical industry groups have used significant resources to develop advanced technologies that enable less invasive spine fusions. These minimally invasive surgery (MIS) technologies often require increased expenditures by hospitals and payers. While several small single center studies have suggested MIS technologies decrease surgical morbidity and reduce hospital stay, evidence documenting benefit from a patient perspective remains limited...
February 27, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28252933/lightweight-open-cell-scaffolds-from-sea-urchin-spines-with-superior-material-properties-for-bone-defect-repair
#20
Lei Cao, Xiaokang Li, Xiaoshu Zhou, Yong Li, Kenneth S Vecchio, Lina Yang, Wei Cui, Rui Yang, Yue Zhu, Zheng Guo, Xing Zhang
Sea urchin spines (Heterocentrotus mammillatus), with a hierarchical open-cell structure similar to that of human trabecular bone and superior mechanical property (compressive strength ∼43.4 MPa) suitable for machining to shape, were explored for potential applications of bone defect repair. Finite element analyses reveal that the compressive stress concentrates along the dense growth rings and dissipates through strut structures of the stereoms, indicating that the exquisite mesostructures play an important role in high strength-to-weight ratios...
March 22, 2017: ACS Applied Materials & Interfaces
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