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Cortical bone trajectory

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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
#1
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...
July 14, 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
#2
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
#3
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
https://www.readbyqxmd.com/read/28497667/midline-lumbar-fusion-with-cortical-bone-trajectory-as-first-line-treatment-in-a-selected-series-of-patients-with-lumbar-instability
#4
Mattia Bruzzo, Paolo Severi, Susanna Bacigaluppi
OBJECT: Aim of the present study was to proof that for certain complex spinal conditions, MIDLIF technique is very convenient in terms of length of hospitalization, functional recovery and pain relief and time to back to work. METHODS: MIDLF indications were set for patients with not more than 3 unstable levels, presence of osteoporosis (alternative to cemented screws), or cardiomyopathy with anticoagulation with or without spinal stenosis, and or discopathy. Surgical difficulties, operative time, hemoglobin loss and postoperative 45 days, 6 months and one-year follow- up data are shown...
May 11, 2017: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/28323704/minimizing-pedicle-screw-pullout-risks-a-detailed-biomechanical-analysis-of-screw-design-and-placement
#5
Rohan-Jean Bianco, Pierre-Jean Arnoux, Eric Wagnac, Jean-Marc Mac-Thiong, Carl-Éric Aubin
STUDY DESIGN: Detailed biomechanical analysis of the anchorage performance provided by different pedicle screw designs and placement strategies under pullout loading. OBJECTIVE: To biomechanically characterize the specific effects of surgeon-specific pedicle screw design parameters on anchorage performance using a finite element model. SUMMARY OF BACKGROUND DATA: Pedicle screw fixation is commonly used in the treatment of spinal pathologies...
April 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28266955/clinical-outcomes-after-posterior-lumbar-interbody-fusion-comparison-of-cortical-bone-trajectory-and-conventional-pedicle-screw-insertion
#6
Shota Takenaka, Yoshihiro Mukai, Kosuke Tateishi, Noboru Hosono, Takeshi Fuji, Takashi Kaito
STUDY DESIGN: This study is a retrospective cohort study using prospectively collected data. OBJECTIVE: To compare the effectiveness of posterior lumbar interbody fusion (PLIF) using the cortical bone trajectory (CBT) and conventional pedicle screw (PS) techniques. SUMMARY OF BACKGROUND DATA: There are few published studies to date comparing PLIF using CBT technique with PLIF using the conventional PS technique. METHODS: We studied 119 consecutive patients who underwent single-level PLIF between 2010 and 2014 with a minimum 12-month follow-up...
March 6, 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/28175405/128%C3%A2-application-of-cortical-bone-trajectory-instrumentation-for-juvenile-and-adolescent-idiopathic-scoliosis
#7
Vishal J Patel, Sohum K Desai, Ken Maynard, Randall Zain Allison, Thomas Frank, Daniel Branch, Aaron Mohanty
No abstract text is available yet for this article.
August 1, 2016: Neurosurgery
https://www.readbyqxmd.com/read/28151859/cortical-bone-trajectory-screws-placement-via-pedicle-or-pedicle-rib-unit-in-the-pediatric-thoracic-spine-t9-t12-a-2-dimensional-multiplanar-reconstruction-study-using-computed-tomography
#8
Jun Xuan, Jian Chen, Hui He, Hai-Ming Jin, Di Zhang, Yao-Sen Wu, Nai-Feng Tian, Xiang-Yang Wang
Thoracic cortical bone trajectory (CBT) screw fixation can maximize the thread contact with cortical bone, and it is 53.8% higher than that of the traditional pedicle screws. Moreover, it can also enable less tissue dissection and retraction for reduced muscle disruption.Eighty pediatric patients are divided into 4 age groups and their thoracic vertebrae are analyzed on computed tomography (CT) images. The maximal screw length, maximal screw diameter, screw diameter, and the cephalad angle are measured. The statistical analysis is performed using the Student's t-test and Pearson's correlation analysis...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28028646/first-clinical-results-of-minimally-invasive-vector-lumbar-interbody-fusion-mis-vlif-in-spondylodiscitis-and-concomitant-osteoporosis-a-technical-note
#9
Bernhard Rieger, Hongzhen Jiang, Daniel Ruess, Clemens Reinshagen, Marek Molcanyi, Jozef Zivcak, Huaiyu Tong, Gabriele Schackert
PURPOSE: First description of MIS-VLIF, a minimally invasive lumbar stabilization, to evaluate its safety and feasibility in patients suffering from weak bony conditions (lumbar spondylodiscitis and/or osteoporosis). METHODS: After informed consent, 12 patients suffering from lumbar spondylodiscitis underwent single level MIS-VLIF. Eight of them had a manifest osteoporosis, either. Pre- and postoperative clinical status was documented using numeric rating scale (NRS) for leg and back pain...
December 27, 2016: European Spine Journal
https://www.readbyqxmd.com/read/27829938/midline-lumbar-fusion-using-cortical-bone-trajectory-screws-preliminary-report
#10
Mateusz Bielecki, Przemysław Kunert, Marek Prokopienko, Arkadiusz Nowak, Tomasz Czernicki, Andrzej Marchel
INTRODUCTION: Midline lumbar fusion (MIDLF) using cortical bone trajectory is an alternative method of transpedicular spinal fusion for degenerative disease. The new entry points' location and screwdriving direction allow the approach-related morbidity to be reduced. AIM: To present our preliminary experience with the MIDLF technique on the first 5 patients with lumbar degenerative disease and with follow-up of at least 6 months. MATERIAL AND METHODS: Retrospective analysis was performed on the first 5 patients with foraminal (4) or central (1) stenosis operated on between December 2014 and February 2015...
2016: Wideochirurgia i Inne Techniki Mało Inwazyjne, Videosurgery and Other Miniinvasive Techniques
https://www.readbyqxmd.com/read/27790318/significance-of-the-pars-interarticularis-in-the-cortical-bone-trajectory-screw-technique-an-in-vivo-insertional-torque-study
#11
Koshi Ninomiya, Koichi Iwatsuki, Yu-Ichiro Ohnishi, Toshika Ohkawa, Toshiki Yoshimine
STUDY DESIGN: Retrospective study. PURPOSE: Cortical bone trajectory (CBT), a more medial-to-lateral and shorter path than the traditional one for spinal fusion, is thought to be effective for severely degenerated vertebrae because screws are primarily stabilized at the posterior elements. We evaluated the efficacy of this approach through in vivo insertional torque measurement. OVERVIEW OF LITERATURE: There has been only one prior in vivo study on CBT insertional torque...
October 2016: Asian Spine Journal
https://www.readbyqxmd.com/read/27755261/cortical-bone-trajectory-technique-for-posterior-spinal-instrumentation
#12
Paul Justin Tortolani, D Alexander Stroh
No abstract text is available yet for this article.
November 2016: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/27642816/clinical-outcomes-with-midline-cortical-bone-trajectory-pedicle-screws-versus-traditional-pedicle-screws-in-moving-lumbar-fusions-from-hospitals-to-outpatient-surgery-centers
#13
Kingsley R Chin, Fabio J R Pencle, André V Coombs, Mohamed Elsharkawy, Corrine F Packer, Elijah A Hothem, Jason A Seale
STUDY DESIGN: Level III. OBJECTIVE: To report on the outcomes of midline cortical bone trajectory (CBT) pedicle screw surgical technique for posterior lumbar fixation in the outpatient surgery center (OSC) compared with traditional pedicle screws in the hospital. SUMMARY OF BACKGROUND DATA: Traditional pedicle screws have been the gold standard for posterior lumbar fusion. Advances in spine surgery, including less invasive procedures have propelled the design of instruments and implants to achieve greater posterior spinal fixation, with decreased tissue destruction and higher safety margins...
July 2017: Clinical Spine Surgery
https://www.readbyqxmd.com/read/27628459/computed-tomography-based-three-dimensional-visualisation-of-bone-corridors-and-trajectories-for-screws-in-open-reduction-and-internal-fixation-of-symphysis-diastasis-a-retrospective-radiological-study
#14
Christian Michelitsch, Thi Dan Linh Nguyen-Kim, Thorsten Jentzsch, Hans-Peter Simmen, Clément M L Werner
INTRODUCTION: Typical stabilisation of pelvic open book injuries consists of plate fixation of the symphysis. No previous literature has been published about the evaluation of screw placement and their trajectory with four oblique 4.5 mm screws using a four-hole plate in symphysis diastasis. The aim of this study was to define insertion points and angles of trajectory for crossed screw placement regardless of any plate design based on an analysis of three-dimensional computed tomography data sets...
December 2016: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/27610286/minimally-invasive-lumbar-pedicle-screw-fixation-using-cortical-bone-trajectory-a-prospective-cohort-study-on-postoperative-pain-outcomes
#15
Yi-Ren Chen, Sayantan Deb, Lan Pham, Harminder Singh
OBJECTIVE: Our study aims to evaluate the clinical outcomes of cortical screws in regards to postoperative pain. BACKGROUND: Pedicle screw fixation is the current mainstay technique for posterior spinal fusion. Over the past decade, a new technique called cortical screw fixation has been developed, which allows for medialized screw placement through stronger cortical bone. There have been several studies that showed either biomechanical equivalence or superiority of cortical screws...
July 26, 2016: Curēus
https://www.readbyqxmd.com/read/27583893/cortical-bone-trajectory-screws-for-the-middle-upper-thorax-an-anatomico-radiological-study
#16
Sun-Ren Sheng, Jiao-Xiang Chen, Wei Chen, En-Xing Xue, Xiang-Yang Wang, Qing-An Zhu
To quantify the reference data concerning the morphometrics of the middle-upper thorax to guide the placement of cortical bone trajectory (CBT) screws.Eighty patients were studied on computed tomography (CT) scans. The reference anatomical parameters were measured. Next, 20 cadaveric specimens were implanted with CBT screws based on CT measurements. These specimens were then judged directly from the cadaveric vertebrae and X-ray.The maximum length of the trajectory, the maximum diameter, and the cephaled angle exhibited a slight increase trend while the transverse and sagittal angles of the pedicle tended to decrease from T3 to T8...
August 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27569519/difference-in-the-trajectory-of-change-in-bone-geometry-as-measured-by-hip-structural-analysis-in-the-narrow-neck-intertrochanteric-region-and-femoral-shaft-between-men-and-women-following-hip-fracture
#17
Alan M Rathbun, Michelle Shardell, Denise Orwig, J Richard Hebel, Gregory E Hicks, Thomas J Beck, Jay Magaziner, Marc C Hochberg
Prior studies have shown that women have declines in bone structure and strength after hip fracture, but it is unclear whether men sustain similar changes. Therefore, the objective was to examine sex differences in proximal femur geometry following hip fracture. Hip structural analysis was used to derive metrics of bone structure and strength: aerial bone mineral density, cross-sectional bone area (CSA), cortical outer diameter, section modulus (SM), and buckling ratio (BR) from dual-energy x-ray absorptiometry scans performed at baseline (within 22days of hospital admission), two, six, or twelve months after hip fracture in men and women (n=282) enrolled in the Baltimore Hip Studies 7th cohort...
November 2016: Bone
https://www.readbyqxmd.com/read/27559442/fixation-strength-of-caudal-pedicle-screws-after-posterior-lumbar-interbody-fusion-with-the-modified-cortical-bone-trajectory-screw-method
#18
Hironobu Sakaura, Toshitada Miwa, Tomoya Yamashita, Yusuke Kuroda, Tetsuo Ohwada
STUDY DESIGN: Clinical case series. PURPOSE: In the posterior lumbar interbody fusion (PLIF) procedure in our institute, the cephalad screw trajectory follows a mediolateral and caudocephalad directed path according to the original cortical bone trajectory (CBT) method. However, the starting point of the caudal screw is at the medial border of the pedicle on an articular surface of the superior articular process, and the trajectory takes a mediolateral path parallel to the cephalad endplate...
August 2016: Asian Spine Journal
https://www.readbyqxmd.com/read/27554355/minimally-invasive-cortical-bone-trajectory-screws-placement-via-pedicle-or-pedicle-rib-unit-in-the-lower-thoracic-spine-a-cadaveric-and-radiographic-study
#19
Jun Xuan, Di Zhang, Hai-Ming Jin, Jiao-Xiang Chen, Dao-Liang Xu, Hong-Ming Xu, Yao-Sen Wu, Xiang-Yang Wang
PURPOSE: To evaluate the feasibility of cortical bone trajectory (CBT) screws fixation via pedicle or pedicle rib unit in the cadaveric thoracic spine (T9-T12). METHODS: Computed tomography (CT) images of 100 patients are analyzed by multiplanar reconstruction. Ten cadaveric thoracic spines are used to insert 4.5 × 35.0 mm CBT screws at all levels from T9 to T12. RESULTS: Maximal screw length obtained by CT has a tendency to gradually increase from T9 (29...
August 23, 2016: European Spine Journal
https://www.readbyqxmd.com/read/27496335/fast-volumetric-imaging-of-bound-and-pore-water-in-cortical-bone-using-three-dimensional-ultrashort-te-ute-and-inversion-recovery-ute-sequences
#20
Jun Chen, Michael Carl, Yajun Ma, Hongda Shao, Xing Lu, Bimin Chen, Eric Y Chang, Zhihong Wu, Jiang Du
We report the three-dimensional ultrashort-TE (3D UTE) and adiabatic inversion recovery UTE (IR-UTE) sequences employing a radial trajectory with conical view ordering for bi-component T2 * analysis of bound water (T2 *(BW) ) and pore water (T2 *(PW) ) in cortical bone. An interleaved dual-echo 3D UTE acquisition scheme was developed for fast bi-component analysis of bound and pore water in cortical bone. A 3D IR-UTE acquisition scheme employing multiple spokes per IR was developed for bound water imaging. Two-dimensional UTE (2D UTE) and IR-UTE sequences were employed for comparison...
October 2016: NMR in Biomedicine
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