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Spinal deformity

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https://www.readbyqxmd.com/read/28087395/lumbar-spinal-muscles-and-spinal-canal-study-by-mri-three-dimensional-reconstruction-in-adult-lumbar-spinal-stenosis
#1
Louis Boissière, Bertrand Moal, Olivier Gille, Elise De-Roquefeuil, Muriel Durieux, Ibrahim Obeid, Vincent Dousset, Jean-Marc Vital, Wafa Skalli
BACKGROUND: Lumbar spinal stenosis is degenerative disc disease most common manifestation. If stenosis degree seems poorly related to symptom severity, lumbar muscles role is recognized. Many studies report imaging methods, to analyze muscle volumes and fat infiltration (FI), but remain limited due to the difficulty to represent entire muscle volume variability. Recently a 3D muscle reconstruction protocol (using the deformation of a parametric specific object method (DPSO) and three point Dixon images) was reported...
January 10, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28079273/abnormal-fetal-muscle-forces-result-in-defects-in-spinal-curvature-and-alterations-in-vertebral-segmentation-and-shape
#2
Rebecca A Rolfe, James H Bezer, Tyler Kim, Ahmed Z Zaidon, Michelle L Oyen, James C Iatridis, Niamh C Nowlan
The incidence of congenital spine deformities, including congenital scoliosis, kyphosis and lordosis, may be influenced by the in utero mechanical environment, and particularly by fetal movements at critical time-points. There is a limited understanding of the influence of fetal movements on spinal development, despite the fact that mechanical forces have been shown to play an essential role in skeletal development of the limb. This study investigates the effects of muscle forces on spinal curvature, vertebral segmentation and vertebral shape by inducing rigid or flaccid paralysis in the embryonic chick...
January 12, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28072705/posterior-only-vertebral-column-resection-for-revision-surgery-in-post-laminectomy-rotokyphoscoliosis-associated-with-late-onset-paraplegia-a-case-report-and-literature-review
#3
Youping Tao, Jigong Wu, Huasong Ma
RATIONALE: Severe post-laminectomy spinal deformity associated with late-onset paraplegia is a complex and rare disorder. Little is known about revision surgery in post-laminectomy rotokyphoscoliosis associated with late-onset paraplegia treated by the single stage posterior-only vertebral column resection (VCR) procedure. PATIENT CONCERNS AND DIAGNOSES: The patient was a 14-year-old male diagnosed as post-laminectomy rotokyphoscoliosis associated with late-onset paraplegia...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28067697/national-administrative-databases-in-adult-spinal-deformity-surgery-a-cautionary-tale
#4
Aaron J Buckland, Gregory Poorman, Robert Freitag, Cyrus Jalai, Eric O Klineberg, Michael Kelly, Peter G Passias
STUDY DESIGN: Comparison between national administrative databases and a prospective multicenter physician managed database. OBJECTIVES: This study aims to assess the applicability of National Administrative Databases (NADs) in Adult Spinal Deformity (ASD). Our hypothesis is that NADs do not include comparable patients as in a physician-managed database (PMD) for surgical outcomes in adult spinal deformity. SUMMARY OF BACKGROUND DATA: NADs such as National Inpatient Sample (NIS) and National Surgical Quality Improvement Program (NSQIP) provide large numbers of publications owing to ease of data access and lack of IRB approval requirement...
January 6, 2017: Spine
https://www.readbyqxmd.com/read/28065817/reproducibility-of-sagittal-radiographic-parameters-in-adolescent-idiopathic-scoliosis-a-guide-to-reference-values-using-serial-imaging
#5
Hwee Weng Dennis Hey, Gordon Chengyuan Wong, Chloe Chan Xiaoyun, Leok-Lim Lau, Naresh Kumar, Joseph Shantakumar Thambiah, John Nathaniel Ruiz, Ka-Po Gabriel Liu, Hee-Kit Wong
BACKGROUND CONTEXT: Knowledge of sagittal radiographical parameters in AIS patients has not yet caught up with our understanding of their roles in patients with adult spinal deformity. It is likely that more emphasis will be placed in restoring sagittal parameters for AIS patients in the future. Therefore we need to understand how these parameters may vary in AIS to facilitate management plans. PURPOSE: To determine the reproducibility of sagittal spinal parameters on lateral film radiographs in patients with AIS...
January 5, 2017: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/28061495/effectiveness-and-safety-of-tranexamic-acid-in-spinal-deformity-surgery
#6
Ho Yong Choi, Seung-Jae Hyun, Ki-Jeong Kim, Tae-Ahn Jahng, Hyun-Jib Kim
OBJECTIVE: Spinal deformity surgery has the potential risk of massive blood loss. To reduce surgical bleeding, the use of tranexamic acid (TXA) became popular in spinal surgery, recently. The purpose of this study was to determine the effectiveness of intra-operative TXA use to reduce surgical bleeding and transfusion requirements in spinal deformity surgery. METHODS: A total of 132 consecutive patients undergoing multi-level posterior spinal segmental instrumented fusion (≥5 levels) were analyzed retrospectively...
January 1, 2017: Journal of Korean Neurosurgical Society
https://www.readbyqxmd.com/read/28060179/uniplanar-versus-fixed-pedicle-screws-in-the-correction-of-thoracic-kyphosis-in-the-treatment-of-adolescent-idiopathic-scoliosis-ais
#7
Siddharth A Badve, Ryan C Goodwin, David Gurd, Thomas Kuivila, Swamy Kurra, William F Lavelle
BACKGROUND: The aim of surgical treatment of scoliosis is to obtain fusion of the spinal column, balanced in the coronal and sagittal planes. Great success has been attained with coronal correction; however, the sagittal profile has received less attention, resulting in little correction of sagittal plane alignment. The purpose of this study was to compare uniplanar and fixed pedicle screws in the correction of the thoracic sagittal alignment in the treatment of adolescent idiopathic scoliosis (AIS)...
January 5, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28059982/morbidity-of-adult-spinal-deformity-surgery-in-elderly-has-declined-over-time
#8
Peter G Passias, Gregory W Poorman, Cyrus M Jalai, Brian Neuman, Rafael de la Garza-Ramos, Emily Miller, Amit Jain, Daniel Sciubba, Shearwood McClelland, Louis Day, Subbu Ramachadran, Shaleen Vira, Bassel Diebo, Evan Isaacs, Olivia Bono, Shay Bess, Michael Gerling, Virginie Lafage
STUDY DESIGN: A retrospective review of a prospectively collected database, the Nationwide Inpatient Sample (NIS), years 2003 to 2012. OBJECTIVES: The aim of this study was to examine trends in the management of scoliosis in elderly (age >75 yrs) patients from 2003 to 2012. SUMMARY OF BACKGROUND DATA: Scoliosis incidence rises with increasing age, and age has been shown to be an independent risk factor for surgical complications in scoliosis surgery...
January 4, 2017: Spine
https://www.readbyqxmd.com/read/28054655/unique-local-bone-tissue-characteristics-in-iliac-crest-bone-biopsy-from-adolescent-idiopathic-scoliosis-with-severe-spinal-deformity
#9
Zhiwei Wang, Huanxiong Chen, Y Eric Yu, Jiajun Zhang, Ka-Yee Cheuk, Bobby K W Ng, Yong Qiu, X Edward Guo, Jack C Y Cheng, Wayne Y W Lee
Adolescent idiopathic scoliosis is a complex disease with unclear etiopathogenesis. Systemic and persistent low bone mineral density is an independent prognostic factor for curve progression. The fundamental question of how bone quality is affected in AIS remains controversy because there is lack of site-matched control for detailed analysis on bone-related parameters. In this case-control study, trabecular bone biopsies from iliac crest were collected intra-operatively from 28 severe AIS patients and 10 matched controls with similar skeletal and sexual maturity, anthropometry and femoral neck BMD Z-score to control confounding effects...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28050455/outcomes-of-short-segment-posterior-instrumentation-in-unstable-thoracolumbar-fractures
#10
Sharvil H Gajjar, Hari J Menon, Nitin Chaudhari, Vipul Chaudhari
INTRODUCTION: The spinal traumas are common and leading problem in orthopaedics practice. The individuals are at a risk of high energy trauma in modern era. Unstable thoracolumbar burst fractures are serious injuries of concern, if left untreated may result in marked morbidity and disability to the patient. Thoracolumbar is the second most common segment involved in the spinal cord following spinal injuries followed by cervical segment. The goal of treatment of any spinal injury is restoration of the patient to maximum possible function with disability free life...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28048824/su-f-t-123-the-simulated-effect-of-the-breath-hold-reproducibility-treating-locally-advanced-lung-cancer-with-pencil-beam-scanned-proton-therapy
#11
J Dueck, R Perrin, G F Persson, A Lomax, M Josipovic, S A Engelholm, D C Weber, P Munck, A F Rosenschöld
PURPOSE: The breath-hold (BH) technique has been suggested to mitigate motion and reduce target coverage degradation due to motion effects. The aim of this study was to investigate the effect of inter-BH residual motion on the dose distribution for pencil beam scanned (PBS) proton therapy of locally-advanced lung cancer patients. METHODS: A dataset of visually-guided BH CT scans was acquired (10 scans per patient) taken from five lung cancer patients: three intra-fractionally repeated CT scans on treatment days 2,16 and 31, in addition to the day 0 planning CT scan...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048629/tu-h-campus-jep2-04-deriving-delivered-doses-to-assess-the-viability-of-2-5-mm-margins-in-head-and-neck-sbrt
#12
S Lin, Q Shang, S Pirozzi, A Godley
PURPOSE: To calculate the delivered dose for head and neck SBRT patients using pre-treatment images. This delivered dose was then used to determine the viability of 2.5 mm margins. METHODS: Daily cone beam CTs (CBCTs) were collected for 20 patients along with a planning CT, planned dose, and planning structures. The day 1 CBCT was aligned to the planning CT using the treatment shifts (six degrees of freedom) and then the dose and contours were transferred to the CBCT...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048554/th-ab-202-03-a-novel-tool-for-computing-deliverable-doses-in-dynamic-mlc-tracking-treatments
#13
M Fast, C Kamerling, S Crijns, M Menten, S Nill, B Raaymakers, U Oelfke
PURPOSE: In tracked dynamic multi-leaf collimator (MLC) treatments, segments are continuously adapted to the target centroid motion in beams-eye-view. On-the-fly segment adaptation, however, potentially induces dosimetric errors due to the finite MLC leaf width and non-rigid target motion. In this study, we outline a novel tool for computing the 4d dose of lung SBRT plans delivered with MLC tracking. METHODS: The following automated workflow was developed: A) centroid tracking, where the initial segments are morphed to each 4dCT phase based on the beams-eye-view GTV shift (followed by a dose calculation on each phase); B) re-optimized tracking, in which all morphed initial plans from (A) are further optimised ("warm-started") in each 4dCT phase using the initial optimisation parameters but phase-specific volume definitions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048532/su-f-t-396-impact-of-shoulder-deformation-for-head-and-neck-vmat
#14
Y Uchida, H Tachibana
PURPOSE: For head and neck VMAT (HN-VMAT), variations of position and deformation of patient's shoulders is a concern to affect inaccuracy of dose distribution. It has been reported that the setup error of the shoulders was variable from 5 mm - 1 cm. The beams of the HN-VMAT pass through the shoulders. We assessed the impact of shoulder deformation to dose distribution for HN-VMAT. METHODS: One HN-VMAT plan was generated using a patient's CT. The patient's CT was deformed using ImSimQA (Oncology Systems Limited, Shrewsbury, Shropshire, UK) to generate several patterns of the shoulders' deformations when the right and left humeral heads were shifted with 3, 6, and 15 mm in the superior and inferior directions (SI), 3, 5, and 15 mm in the anterior and posterior directions (AP), and 5 and 15 mm in the right or left direction (LR)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048300/th-cd-206-10-clinical-application-of-the-mind-demons-algorithm-for-symmetric-diffeomorphic-deformable-mr-to-ct-image-registration-in-spinal-interventions
#15
S Reaungamornrat, T De Silva, A Uneri, J Wolinsky, A Khanna, G Kleinszig, S Vogt, J Prince, J Siewerdsen
PURPOSE: Accurate intraoperative localization of target anatomy (e.g., tumors and vertebral levels) and critical structures (e.g., nerves and vessels) is essential to safe, effective surgery. Preoperative CT/MR images can be used to identify such vital anatomy in intraoperative images through multimodality deformable registration. We proposed a deformable registration method to align preoperative MR to intraoperative CT using modality-independent neighborhood descriptors (MIND) and a Huber metric for robust registration...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048063/su-f-j-85-evaluation-of-the-velocity-deformable-image-registration-algorithm
#16
D Polan, J Kamp, J Y Lee, C Chapman, M Green, S Payal, M Kessler, K Brock
PURPOSE: To perform validation and commissioning of a commercial deformable image registration (DIR) algorithm (Velocity, Varian Medical Systems) for numerous clinical sites using single and multi-modality images. METHODS: In this retrospective study, the DIR algorithm was evaluated for 10 patients in each of the following body sites: head and neck (HN), prostate, liver, and gynecological (GYN). HN DIRs were evaluated from planning (p)CT to re-pCT and pCTs to daily CBCTs using dice similarity coefficients (DSC) of corresponding anatomical structures...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047580/su-f-p-27-the-study-of-actual-dvh-for-target-and-oars-during-the-radiotherapy-of-non-small-cell-lung-cancer
#17
C Ma, Y Yin
PURPOSE: To analyze the changes of the volume and dosimetry of target and organs at risk (OARs) by comparing the daily CBCT images and planning CT images of the patients with Non-Small Cell Lung Cancer (NSCLC) and analyze the difference between planned dose and accumulated dose. METHODS: This study retrospectively analyzed eight cases of non-small cell lung cancer patients who accepted CRT or IMRT treatment and KV-CBCT. For each patient, the prescription dose was 60Gy and the fraction dose was 2Gy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047350/su-f-t-256-4d-imrt-planning-using-an-early-prototype-gpu-enabled-eclipse-workstation
#18
A Hagan, A Modiri, M Svatos, A Sawant
PURPOSE: True 4D IMRT planning, based on simultaneous spatiotemporal optimization has been shown to significantly improve plan quality in lung radiotherapy. However, the high computational complexity associated with such planning represents a significant barrier to widespread clinical deployment. We introduce an early prototype GPU-enabled Eclipse workstation for inverse planning. To our knowledge, this is the first GPUintegrated Eclipse system demonstrating the potential for clinical translation of GPU computing on a major commercially-available TPS...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047301/tu-ab-202-10-how-effective-are-current-atlas-selection-methods-for-atlas-based-auto-contouring-in-radiotherapy-planning
#19
D Peressutti, B Schipaanboord, J van Soest, T Lustberg, W van Elmpt, T Kadir, A Dekker, M Gooding
PURPOSE: To investigate the effectiveness of atlas selection methods for improving atlas-based auto-contouring in radiotherapy planning. METHODS: 275 H&N clinically delineated cases were employed as an atlas database from which atlases would be selected. A further 40 previously contoured cases were used as test patients against which atlas selection could be performed and evaluated. 26 variations of selection methods proposed in the literature and used in commercial systems were investigated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047182/su-f-t-421-dosimetry-change-during-radiotherapy-and-dosimetry-difference-for-rigid-and-deformed-registration-in-the-mid-thoracic-esophageal-carcinoma
#20
C Tao, T Liu, J Chen, J Zhu, Y Yin
PURPOSE: This study aimed to analyze dosimetry changes during radiotherapy for the mid-thoracic esophageal carcinoma, and investigate dosimetry difference between rigid and deformed registration. METHODS: Twelve patients with primary middle thoracic esophageal carcinoma were selected randomly. Based on first CT scanning of each patient, plans-o were generated by experience physicists. After 20 fractions treatment, the corresponding plans-re were created with second CT scanning...
June 2016: Medical Physics
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