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Spine implants

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https://www.readbyqxmd.com/read/29355744/iatrogenic-peritonitis-following-an-incident-during-ablation-of-a-pedicle-screw
#1
P Cottin, N Mebtouche, G Pourcher, N Devaquet, T Bégué, P Trouiller, B Sztrymf
Immediate complications can arise due to faulty implantation of material during fusion procedures, but none have been reported in connection with ablation of material in the spine. We report a case of intraperitoneal migration of a pedicle screw during attempted removal. It crossed the psoas muscle and perforated a small-intestine loop, triggering hemorrhagic shock and peritonitis by perforation. We analyze the causes and mechanisms underlying this exceptional case of migration, with a view to sharing preventive measures...
January 16, 2018: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/29354749/focal-hypermobility-observed-in-cervical-arthroplasty-with-mobi-c
#2
Jack William Kerferd, David Abi-Hanna, Kevin Phan, Prashanth Rao, Ralph J Mobbs
In recent decades cervical arthroplasty, or cervical disc replacement, has been steadily increasing in popularity as a procedure for the treatment of degenerative pathologies of the cervical spine. This is based on an evolving body of literature that documents superior outcomes in cervical disc replacement over fusion, for both single and double level pathologies, in well selected patients. One of the more recent and popular implants currently on the market is the Mobi-C cervical artificial disc (LDR Medical; Troyes, France)...
December 2017: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/29354745/percutaneous-screw-placement-in-the-lumbar-spine-with-a-modified-guidance-technique-based-on-3d-ct-navigation-system
#3
REVIEW
Ioannis D Siasios, John Pollina, Asham Khan, Vassilios George Dimopoulos
Several guidance techniques have been employed to increase accuracy and reduce surgical time during percutaneous placement of pedicle screws (PS). The purpose of our study was to present a modified technique for percutaneous placement of lumbar PS that reduces surgical time. We reviewed 23 cases of percutaneous PS placement using our technique for minimally invasive lumbar surgeries and 24 control cases where lumbar PS placement was done via common technique using Jamshidi needles (Becton, Dickinson and Company, Franklin Lakes, NJ, USA)...
December 2017: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/29354727/does-the-law-of-diminishing-returns-apply-to-the-lengthening-of-the-mcgr-rod-in-early-onset-scoliosis-with-reference-to-growth-velocity
#4
Adrian Gardner, Alistair Beaven, David Marks, Jonathan Spilsbury, Jwalant Mehta, Matthew Newton Ede
Background: This study is a single centre retrospective review of prospectively collected data. The 'law of diminishing returns' describes the number of lengthening episodes that a traditional growth rod (TGR) can undergo before stiffness across the construct prevents further increases in overall length. It is unclear whether this will affect MCGR when used in the management of early onset scoliosis (EOS). Methods: A retrospective review of prospectively collected data on the experience of MCGR lengthening in a heterogenous cohort of children with EOS from a single centre...
December 2017: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/29351870/de-novo-generation-in-an-in-vivo-rat-model-and-biomechanical-characterization-of-autologous-transplants-for-ligament-and-tendon-reconstruction
#5
Marc Soubeyrand, Elisabeth Laemmel, Nathalie Maurel, Amadou Diop, Thierry Lazure, Jacques Duranteau, Eric Vicaut
BACKGROUND: Surgical reconstruction of ligaments and tendons is frequently required in clinical practice. The commonly used autografts, allografts, or synthetic transplants present limitations in terms of availability, biocompatibility, cost, and mechanical properties that tissue bioengineering aims to overcome. It classically combines an exogenous extracellular matrix with cells, but this approach remains complex and expensive. Using a rat model, we tested a new bioengineering strategy for the in vivo and de novo generation of autologous grafts without the addition of extracellular matrix or cells, and analyzed their biomechanical and structural properties...
December 14, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29350015/-application-of-finite-element-method-in-spinal-biomechanics
#6
REVIEW
Qiang Liu, Jun Zhang, Shu-Chun Sun, Fei Wang
The finite element model is one of the most important methods in study of modern spinal biomechanics, according to the needs to simulate the various states of the spine, calculate the stress force and strain distribution of the different groups in the state, and explore its principle of mechanics, mechanism of injury, and treatment effectiveness. In addition, in the study of the pathological state of the spine, the finite element is mainly used in the understanding the mechanism of lesion location, evaluating the effects of different therapeutic tool, assisting and completing the selection and improvement of therapeutic tool, in order to provide a theoretical basis for the rehabilitation of spinal lesions...
February 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29343756/radiological-and-clinical-differences-among-three-assisted-technologies-in-pedicle-screw-fixation-of-adult-degenerative-scoliosis
#7
Yong Fan, Jin Peng Du, Ji Jun Liu, Jia Nan Zhang, Shi Chang Liu, Ding Jun Hao
The purpose of this study was to compare the clinical and radiological differences among three advanced guided technologies in adult degenerative scoliosis. A total of 1012 pedicle screws were inserted in 83 patients using a spine robot (group A), 886 screws were implanted in 75 patients using a drill guide template (group B), and 1276 screws were inserted in 109 patients using CT-based navigation (group C). Screw positions were evaluated using postoperative CT scans according to the Gertzbein and Robbins classification...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29336820/micro-ct-and-micro-fe-analysis-of-pedicle-screw-fixation-under-different-loading-conditions
#8
Y Chevalier, M Matsuura, S Krüger, C Fleege, M Rickert, M Rauschmann, C Schilling
Anchorage of pedicle screw instrumentation in the elderly spine with poor bone quality remains challenging. In this study, micro finite element (µFE) models were used to assess the specific influence of screw design and the relative contribution of local bone density to fixation mechanics. These were created from micro computer tomography (µCT) scans of vertebras implanted with two types of pedicle screws, including a full region-or-interest of 10 mm radius around each screw, as well as submodels for the pedicle and inner trabecular bone of the vertebral body...
December 26, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/29331289/titanium-scaffolding-an-innovative-modality-for-salvage-of-failed-first-ray-procedures
#9
Natalie Coriaty, Katherine Pettibone, Nicholas Todd, Shannon Rush, Ryan Carter, Colin Zdenek
Shortening of the first ray is a potential complication associated with first metatarsal procedures. Correction of this deformity conventionally has required the use of a tricortical bone graft to lengthen the bone. Graft complications, including donor site morbidity, poor graft stability, and graft resorption, have revealed a need for an alternative procedure. The present report shows that titanium cage scaffolding has lower extremity applications beyond its previous uses in the ankle and spine. Two patients underwent surgical correction for failed first ray procedures using a titanium cage apparatus with a calcaneal autograft and other biologic agents...
January 11, 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29315128/parallel-proximal-fixation-in-rib-based-growing-rod-system-a-novel-approach-to-deal-with-proximal-anchor-migration
#10
John Heflin, Michelle Welborn, Norman Ramirez-Lluch, Ivan Iriarte, Ron El-Hawary, Graham T Fedorak, John T Smith
STUDY DESIGN: Retrospective case control OBJECTIVE.: To report on differences in implant failure rates and complications requiring reoperation in children with early-onset scoliosis (EOS) treated with rib-based distraction utilizing four proximal fixation points in either a parallel or in-line configuration. SUMMARY OF BACKGROUND DATA: Proximal anchor failure continues to be a significant problem in growth-friendly surgery using rib-based distraction to treat children with EOS...
January 8, 2018: Spine
https://www.readbyqxmd.com/read/29310670/the-comparison-of-clinical-outcome-of-fresh-type-ii-odontoid-fracture-treatment-between-anterior-cannulated-screws-fixation-and-posterior-instrumentation-of-c1-2-without-fusion-a-retrospective-cohort-study
#11
Suomao Yuan, Bin Wei, Yonghao Tian, Jun Yan, Wanlong Xu, Lianlei Wang, Xinyu Liu
BACKGROUND: Recently, the excellent outcomes of temporary fixation of C1-2 without fusion in the treatment of odontoid fracture had been reported. It is still unclear if this technique could achieve the equivalent outcomes as the golden standard technique of anterior screw fixation. The objective of this study is to compare the clinical outcome of two treatments of fresh type II odontoid fracture: anterior cannulated screws fixation (ACSF) versus posterior instrumentation of C1-2 without fusion (PIWF)...
January 8, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29307048/biomechanical-analysis-of-a-new-lumbar-interspinous-device-with-optimized-topology
#12
Chen-Sheng Chen, Shih-Liang Shih
Interspinous spacers used stand-alone preserve joint movement but provide little protection for diseased segments of the spine. Used as adjuncts with fusion, interspinous spacers offer rigid stability but may accelerate degeneration on adjacent levels. Our new device is intended to balance the stability and preserves motion provided by the implant. A new interspinous spacer was devised according to the results of topology optimization studies. Four finite element (FE) spine models were created that consisted of an intact spine without an implant, implantation of the novel, the device for intervertebral assisted motion (DIAM system), and the Dynesys system...
January 6, 2018: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/29303472/biomechanics-of-unilateral-and-bilateral-sacroiliac-joint-stabilization-laboratory-investigation
#13
Derek P Lindsey, Robin Parrish, Mukund Gundanna, Jeremi Leasure, Scott A Yerby, Dimitriy Kondrashov
OBJECTIVE Bilateral symptoms have been reported in 8%-35% of patients with sacroiliac (SI) joint dysfunction. Stabilization of a single SI joint may significantly alter the stresses on the contralateral SI joint. If the contralateral SI joint stresses are significantly increased, degeneration may occur; alternatively, if the stresses are significantly reduced, bilateral stabilization may be unnecessary for patients with bilateral symptoms. The biomechanical effects of 1) unilateral stabilization on the contralateral SI joint and 2) bilateral stabilization on both SI joints are currently unknown...
January 5, 2018: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29299474/improvement-in-hamstring-and-quadriceps-muscle-strength-following-cruciate-retaining-single-radius-total-knee-arthroplasty
#14
Jennifer Kurowicki, Anton Khlopas, Assem A Sultan, Nipun Sodhi, Linsen T Samuel, Morad Chughtai, Martin Roche, Peter M Bonutti, Michael A Mont
Background: The ability to reach full functional capacity following total knee arthroplasty (TKA) is reliant on the strength of the quadriceps and hamstring muscles. Weakness of these muscles can persist anywhere from 1 to 3 years post-operatively. There remains considerable controversy as to what factors influence restoration of muscle strength after TKA. Implant designs have been implicated in the ability of patients to recover. Currently there is a paucity of literature available describing the influence of patient characteristics, surgical factors, and clinical outcomes on quadriceps and hamstring muscle strength following TKA with a cruciate-retaining, single radius (SR) implant...
December 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29298959/lumbar-model-generator-a-tool-for-the-automated-generation-of-a-parametric-scalable-model-of-the-lumbar-spine
#15
C E Lavecchia, D M Espino, K M Moerman, K M Tse, D Robinson, P V S Lee, D E T Shepherd
Low back pain is a major cause of disability and requires the development of new devices to treat pathologies and improve prognosis following surgery. Understanding the effects of new devices on the biomechanics of the spine is crucial in the development of new effective and functional devices. The aim of this study was to develop a preliminary parametric, scalable and anatomically accurate finite-element model of the lumbar spine allowing for the evaluation of the performance of spinal devices. The principal anatomical surfaces of the lumbar spine were first identified, and then accurately fitted from a previous model supplied by S14 Implants (Bordeaux, France)...
January 2018: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29295647/prophylactic-riluzole-attenuates-oxidative-stress-damage-in-spinal-cord-distraction
#16
Eileen Nicole Shimizu, Jennifer L Seifert, Kevin J Johnson, Mario Romero-Ortega
Spinal cord injury (SCI) without radiographic abnormalities (SCIWORA) presents a significant challenge due the loss of function despite an apparent normal anatomy. The cause of dysfunction is not understood and specific treatment options are lacking. Some scoliosis corrective surgeries result in SCIWORA, where stretching of the spinal cord can lead to vascular compromise and hypoxia. This procedure allows for the implantation of neuroprotective strategies designed to prevent iatrogenic SCI. We utilized a model of atraumatic SCI to evaluate the efficacy of the sodium channel blocker Riluzole, as a prophylactic neuroprotectant...
January 2, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29287816/comparison-of-percentile-weight-gain-of-growth-friendly-constructs-in-early-onset-scoliosis
#17
Liam R Harris, Lindsay M Andras, Paul D Sponseller, Charles E Johnston, John B Emans, David L Skaggs
STUDY DESIGN: Multicenter retrospective cohort. OBJECTIVE: To compare improvement in nutritional status seen in early-onset scoliosis (EOS) patients following treatment with various growth-friendly techniques, especially in underweight patients (<20th weight percentile). BACKGROUND: Thoracic insufficiency resulting from EOS can lead to severe cardiopulmonary disease. In this age group, pulmonary function tests are often difficult or impossible to perform...
January 2018: Spine Deformity
https://www.readbyqxmd.com/read/29285413/minimally-invasive-repair-of-a-pseudomeningocele-caused-by-a-sheared-intrathecal-catheter-following-implantation-of-a-drug-delivery-system
#18
S Raju, P O Champagne, L Walsh, Daniel J Denis
Background: Shearing of an intrathecal catheter during implantation of a drug delivery system is an underreported complication that can be challenging to manage. Case Description: A 53-year-old man with refractory cancer pain had an intrathecal pump system implanted. The procedure was complicated with catheter shear and retention in the intrathecal space. A second catheter was successfully placed but formation of a painful pseudomeningocele and ineffective pain relief complicated the outcome...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/29283901/vertebroplasty-and-kyphoplasty-for-metastatic-spinal-lesions-a-systematic-review
#19
Mohsen Sadeghi-Naini, Shahram Aarabi, Farhad Shokraneh, Leila Janani, Alexander R Vaccaro, Vafa Rahimi-Movaghar
INTRODUCTION: The spine is the most common site of bone metastases. Vertebroplasty (VP) and kyphoplasty (KP) have been proposed as potential minimally invasive therapeutic options for metastatic spinal lesion (MSL) pain. However, the efficacy of VP and KP on MSL pain is currently unclear. OBJECTIVE: The aim of this study was to assess the effects of VP and KP compared with each other, usual care, or other treatments on pain, disability, and quality of life following MSL...
December 27, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/29279998/modified-anterior-only-reduction-and-fixation-for-traumatic-cervical-facet-dislocation-ao-type-c-injuries
#20
Rishi M Kanna, Ajoy P Shetty, S Rajasekaran
PURPOSE: Surgical reduction of uni and bi-facetal dislocations of the cervical spine (AO type C injuries) can be performed by posterior, anterior or combined approaches. Ease of access, low infection rates and less risks of neurological worsening has popularized anterior approach. However, the reduction of locked cervical facets can be intricate through anterior approach. We analyzed the safety, efficacy and outcomes at a minimum 1 year, of a novel anterior reduction technique for consecutively treated cervical facet dislocations...
December 26, 2017: European Spine Journal
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