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Cortical bone trajectory

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https://www.readbyqxmd.com/read/29433165/considerations-in-meta-analysis-regarding-complications-of-cortical-bone-trajectory-versus-traditional-pedicle-screw-fixation
#1
Kevin Phan, Ralph J Mobbs
No abstract text is available yet for this article.
February 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29394462/sex-ethnic-and-age-specific-centile-curves-for-pqct-and-hr-pqct-derived-measures-of-bone-structure-and-strength-in-adolescents-and-young-adults
#2
Leigh Gabel, Lindsay A Nettlefold, Heather M Macdonald, Heather A McKay
There are presently no adolescent centile curves for bone parameters at the tibial midshaft using peripheral quantitative computed tomography (pQCT) or at the distal radius and tibia using high-resolution pQCT (HR-pQCT). Thus, we aimed to develop sex-, ethnic-, site- and age-specific centile curves for pQCT and HR-pQCT-derived bone outcomes for youth and young adults aged 10-21 years. We acquired pQCT scans (XCT3000) at the tibial midshaft (50% site) and HR-pQCT scans (XtremeCT, Scanco Medical) at the distal radius (7% site) and tibia (8% site) in a convenience sample of participants in the mixed-longitudinal University of British Columbia Healthy Bones III Study...
February 2, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/29354747/systematic-review-of-cortical-bone-trajectory-versus-pedicle-screw-techniques-for-lumbosacral-spine-fusion
#3
REVIEW
Kevin Phan, Vignesh Ramachandran, Tommy M Tran, Kevin P Shah, Matthew Fadhil, Alan Lackey, Nicholas Chang, Ai-Min Wu, Ralph J Mobbs
Fusion of the lumbosacral spine is a common surgical procedure to address a range of spinal pathologies. Fixation in lumbar fusion has traditionally been performed using pedicle screw (PS) augmentation. However, an alternative method of screw insertion via cortical bone trajectory (CBT) has been advocated as a less invasive approach which improves initial fixation and reduces neurovascular injury. There is a paucity of robust clinical evidence to support these claims, particularly in comparison to traditional pedicle screws...
December 2017: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/29319607/longitudinal-resting-state-fmri-in-a-mouse-model-of-metastatic-bone-cancer-reveals-distinct-functional-reorganizations-along-a-developing-chronic-pain-state
#4
David Buehlmann, Joanes Grandjeanc, Jael Xandryd, Markus Rudin
Functional neuroimaging has emerged as attractive option for characterizing pain states complementing behavioral readouts or clinical assessment. In particular resting-state fMRI (rs-fMRI) enables monitoring of functional adaptations across the brain, e.g. in response to chronic nociceptive input. We have used rs-fMRI in a mouse model of chronic pain from breast cancer derived tibial bone metastases to identify pain-induced alterations in functional connectivity (FC). Combined assessment of behavioral readouts allowed defining a trajectory as model function for extracting pain-specific FC changes from the fMRI data reflective of a chronic pain state...
January 9, 2018: Pain
https://www.readbyqxmd.com/read/29287813/pedicle-screw-with-increased-cortical-purchase-can-be-inserted-with-same-accuracy-as-the-screw-in-straightforward-trajectory-using-3d-modeling-landmarks
#5
Michal Szczodry, Giovanni F Solitro, Farid Amirouche, Priyesh Patel
STUDY DESIGN: Comparison, in terms of insertion accuracy and biomechanical performance, between an increased cortical purchase and straightforward pedicle screw trajectory. OBJECTIVE: This study aims to compare a trajectory with increased cortical purchase to the more common straightforward trajectory in terms of strength and insertion accuracy using real-time navigation. SUMMARY OF BACKGROUND DATA: In previous studies, it was suggested that pedicle screw pullout strength is strongly correlated with bone mineral density, and using a more cortical tract allows a greater portion of the denser bone, the cortex, to be in contact with the screw...
January 2018: Spine Deformity
https://www.readbyqxmd.com/read/29260301/regional-hounsfield-unit-measurement-of-screw-trajectory-for-predicting-pedicle-screw-fixation-using-cortical-bone-trajectory-a-retrospective-cohort-study
#6
Keitaro Matsukawa, Yuichiro Abe, Yoshihide Yanai, Yoshiyuki Yato
BACKGROUND: The sufficiency of screw anchoring is a critical factor for achieving successful spinal fusion; however, no reliable method for predicting pedicle screw fixation has been established. Recently, Hounsfield units (HU) obtained from computed tomography (CT) was developed as a new reliable tool to determine the bone quality. The purpose of the present study was to demonstrate the utility of regional HU measurement of the screw trajectory to predict the primary and long-term fixation strength of pedicle screws...
February 2018: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29208475/cortical-bone-trajectory-screws-fixation-in-lumbar-adjacent-segment-disease-a-technique-note-with-case-series
#7
Chao-Hsuan Chen, Hsieng-Ming Huang, Der-Cherng Chen, Chih-Ying Wu, Han-Chun Lee, Der-Yang Cho
Lumbar adjacent segment disease after lumbar fusion surgery often requires surgical intervention. However, subsequent surgical treatment often needs to expose and remove all of the previous instruments. This additional surgery leads to significant post-operative pain, muscular fibrosis, poor wound healing and infection, etc. From October 2015 to March 2016, we collected six cases underwent cortical bone trajectory screws fixation with minimal invasive inter-body cage fusion for lumbar adjacent segment disease...
February 2018: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29155112/posterior-lumbar-interbody-fusion-with-3d-navigation-guided-cortical-bone-trajectory-screws-for-l4-5-degenerative-spondylolisthesis-1-year-clinical-and-radiographic-outcomes
#8
Ibrahim Hussain, Michael S Virk, Thomas W Link, Apostolos J Tsiouris, Eric Elowitz
OBJECTIVE: We describe our technique and evaluate clinical and radiographic outcomes for patients undergoing L4/5 posterior lumbar interbody fusion with 3D-navigation guided cortical bone trajectory screws (PLIF-CBT) for grade 1 or 2 degenerative spondylolisthesis with a minimum follow-up time of 12 months. METHODS: A single-institution series of 18 patients was evaluated with data prospectively collected and retrospectively analyzed. Pain and disability scores were collected preoperatively and at a minimum of 12 months postoperatively, including back and bilateral leg pain visual analog scores (VAS) and Oswestry Disability Index (ODI) scores...
November 16, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29148922/feasibility-and-safety-of-using-thoracic-and-lumbar-cortical-bone-trajectory-pedicle-screws-in-spinal-constructs-in-children-technical-note
#9
Jonathan N Sellin, Jeffrey S Raskin, Kristen A Staggers, Alison Brayton, Valentina Briceño, Amee J Moreno, Andrew Jea
Thoracic and lumbar cortical bone trajectory pedicle screws have been described in adult spine surgery. They have likewise been described in pediatric CT-based morphometric studies; however, clinical experience in the pediatric age group is limited. The authors here describe the use of cortical bone trajectory pedicle screws in posterior instrumented spinal fusions from the upper thoracic to the lumbar spine in 12 children. This dedicated study represents the initial use of cortical screws in pediatric spine surgery...
November 17, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29125430/cortical-bone-trajectory-screw-fixation-versus-traditional-pedicle-screw-fixation-for-2-level-posterior-lumbar-interbody-fusion-comparison-of-surgical-outcomes-for-2-level-degenerative-lumbar-spondylolisthesis
#10
Hironobu Sakaura, Toshitada Miwa, Tomoya Yamashita, Yusuke Kuroda, Tetsuo Ohwada
OBJECTIVE The cortical bone trajectory (CBT) screw technique is a new nontraditional pedicle screw (PS) insertion method. However, the biomechanical behavior of multilevel CBT screw/rod fixation remains unclear, and surgical outcomes in patients after 2-level posterior lumbar interbody fusion (PLIF) using CBT screw fixation have not been reported. Thus, the purposes of this study were to examine the clinical and radiological outcomes after 2-level PLIF using CBT screw fixation for 2-level degenerative lumbar spondylolisthesis (DS) and to compare these outcomes with those after 2-level PLIF using traditional PS fixation...
November 10, 2017: Journal of Neurosurgery. Spine
https://www.readbyqxmd.com/read/29093793/review-of-cortical-bone-trajectory-evidence-of-a-new-technique
#11
REVIEW
Juan Delgado-Fernandez, Maria Ángeles García-Pallero, Guillermo Blasco, Paloma Pulido-Rivas, Rafael G Sola
This article summarizes recent evidence on the cortical bone trajectory (CBT) obtained from published anatomical, biomechanical, and clinical studies. CBT was proposed by Santoni in 2009 as a new trajectory that can improve the fixation of pedicle screws in response to screw loosening in osteoporotic patients. Recently, research interest has been growing with increasing numbers of published series and frequent reports of new applications. We performed an online database search using the terms "cortical bone trajectory," "pedicle screw," "CBT spine," "CBT fixation," "MISS CBT," and "traditional trajectory...
October 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/29074318/pedicle-screws-with-modular-head-vs-preassembled-head-used-in-cortical-bone-trajectory-can-pars-and-pedicle-fractures-be-prevented-in-osteoporotic-bone
#12
Wayne K Cheng, Yusuf T Akpolat, Serkan İnceoğlu, Olumide A Danisa
Pars and pedicle fractures as a result of CBT (cortical bone trajectory) during pedicle screw placement have been reported. The primary aim of the study is to compare the fracture rate between screws with modular heads to screws with standard pre-assembled tulip heads. The secondary aim of the study is to determine the potential variables that can be identified prior to instrumentation in order to predict risk of fractures. Twenty-four fresh frozen lumbar vertebrae were obtained from five different cadavers...
October 23, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29061616/transforaminal-lumbar-interbody-fusion-with-cortical-bone-trajectory-screws-versus-traditional-pedicle-screws-fixation-a-study-protocol-of-randomised-controlled-trial
#13
Zhenhua Feng, Xiaobin Li, Qian Tang, Chenggui Wang, Wenhao Zheng, Hui Zhang, Ai-Min Wu, Naifeng Tian, Yaosen Wu, Wenfei Ni
INTRODUCTION: Transforaminal lumbar interbody fusion (TLIF) has been widely used in the treatment of lumbar degenerative disc disorders and shows favourable clinical results. Recently, cortical bone trajectory (CBT) has become a new trajectory for screw insertion in the lumbar spine. Several biomechanical studies have demonstrated that the CBT technique achieves screw purchase and strength greater than the traditional method. Currently, the available data on the clinical effectiveness of the two performed surgeries, TLIF with CBT screws (CBT-TLIF) and TLIF with traditional pedicle screws (PS-TLIF), are insufficient...
October 22, 2017: BMJ Open
https://www.readbyqxmd.com/read/28966154/comparative-study-of-cortical-bone-trajectory-pedicle-screw-cortical-screw-versus-conventional-pedicle-screw-in-single-level-posterior-lumbar-interbody-fusion-a-2-year-post-hoc-analysis-from-prospectively-randomized-data
#14
Gun Woo Lee
OBJECTIVE: The aim of this study was to report 2-year follow-up outcomes of posterior lumbar interbody fusion (PLIF) with cortical bone trajectory-pedicle screw (CS), in terms of fusion rates, clinical outcomes, surgical outcomes, and complications, and to compare these outcomes with outcomes for PLIF with conventional pedicle screw (PS). METHODS: We enrolled 79 patients and randomly assigned them to 2 groups (group A with PS, 39 patients; group B with CS, 40 patients), and finally 37 and 35 in group A and B were analyzed in the study...
September 28, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28875092/thoracolumbar-cortical-screw-placement-with-interbody-fusion-technique-and-considerations
#15
Michael Karsy, Michael R Jensen, Kyril Cole, Jian Guan, Andrea Brock, Chad Cole
A surge in interest in cortical bone trajectory (CBT), first described by Santoni in 2009, may be a result of its numerous advantages, including reduced surgical incision length and lateral dissection, limited disruption of the facet joints, and decreased blood loss. In addition, CBT offers improved screw pullout strength and the ability to perform hybrid constructs with pedicle screws using minimally invasive approaches. However, one of the main limitations of the technique involves the small screw size, which limits the potential for long-segment constructs...
July 2, 2017: Curēus
https://www.readbyqxmd.com/read/28857932/the-cortical-bone-trajectory-for-pedicle-screw-insertion
#16
I David Kaye, Srinivas K Prasad, Alex R Vaccaro, Alan S Hilibrand
No abstract text is available yet for this article.
August 2017: JBJS Reviews
https://www.readbyqxmd.com/read/28834567/ethnic-differences-in-peripheral-skeletal-development-among-urban-south-african-adolescents-a-ten-year-longitudinal-pqct-study
#17
S M Schoenbuchner, J M Pettifor, S A Norris, L K Micklesfield, A Prentice, K A Ward
There are no longitudinal pQCT data of bone growth and development from sub-Saharan Africa, where rapid environmental, societal and economic transitions are occurring, and where fracture rates are predicted to rise. The aim of this study was to compare skeletal development in black and white South African adolescents using longitudinal data from the Birth to Twenty study. The Birth to Twenty Bone Health sub-cohort consisted of 543 adolescents (261[178 black] girls, 282[201 black] boys). Annual pQCT measurements of the radial and tibial metaphysis and diaphysis were obtained between ages 12 and 22 years (distal metaphysis: cross-sectional area [CSA] and trabecular bone mineral density [BMD]; diaphysis: total and cortical CSA, cortical BMD and polar stress-strain index [SSIp])...
August 23, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28716680/three-dimensional-adiabatic-inversion-recovery-prepared-ultrashort-echo-time-cones-3d-ir-ute-cones-imaging-of-cortical-bone-in-the-hip
#18
Amin Nazaran, Michael Carl, Yajun Ma, Saeed Jerban, Yanchun Zhu, Xing Lu, Jiang Du, Eric Y Chang
PURPOSE: We present three-dimensional adiabatic inversion recovery prepared ultrashort echo time Cones (3D IR-UTE-Cones) imaging of cortical bone in the hip of healthy volunteers using a clinical 3T scanner. METHODS: A 3D IR-UTE-Cones sequence, based on a short pulse excitation followed by a 3D Cones trajectory, with a nominal TE of 32μs, was employed for high contrast morphological imaging of cortical bone in the hip of heathy volunteers. Signals from soft tissues such as muscle and marrow fat were suppressed via adiabatic inversion and signal nulling...
December 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28621468/characteristics-of-regional-bone-quality-in-cervical-vertebrae-considering-bmd-determining-a-safe-trajectory-for-cervical-pedicle-screw-fixation
#19
Moon-Kyu Kim, Ho-Jung Cho, Dai-Soon Kwak, Seung-Hoon You
This study aimed to report the mechanical strength and characteristics of the lateral mass and pedicle considering BMD for the safe insertion of pedicle screws in the subaxial cervical level. We evaluated BMD and Hounsfield unit (HU) values of cortical bones at the lateral mass and pedicle of C3-7 from CT images in 99 patients. Patients were divided into three groups (Group A, T-score ≥ -1; Group B, -2.5 < T-score < -1.0; Group C, T-score ≤ -2.5). The HU numbers of cortical bone in the vertebral canal (medial wall of the lateral mass; cHU), posterior wall of the transverse foramen (fHU), and medial wall, lateral wall, and trabecular area of the pedicle (mHU, lHU, and pHU, respectively) were measured on the CT images in the middle of the pedicle...
June 16, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28525468/cortical-bone-trajectory-for-thoracic-pedicle-screws-a-technical-note
#20
Keitaro Matsukawa, Yoshiyuki Yato, Richard A Hynes, Hideaki Imabayashi, Naobumi Hosogane, Takashi Asazuma, Toshiyasu Matsui, Yasushi Kobayashi, Koichi Nemoto
STUDY DESIGN: A morphometric measurement of new thoracic pedicle screw trajectory using computed tomography and a biomechanical study on cadaveric thoracic vertebrae using insertional torque. OBJECTIVE: To introduce a new thoracic pedicle screw trajectory which maximizes engagement with denser bone. SUMMARY OF BACKGROUND DATA: Cortical bone trajectory (CBT) which maximizes the thread contact with cortical bone provides enhanced screw purchase...
June 2017: Clinical Spine Surgery
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