scholarly journals Investigation of in vivo three‐dimensional changes of the spinal canal after corrective surgeries of the idiopathic scoliosis

JOR Spine ◽  
2021 ◽  
Author(s):  
Chaofan Han ◽  
Yong Hai ◽  
Chaochao Zhou ◽  
Peng Yin ◽  
Runsheng Guo ◽  
...  
Keyword(s):  
Idiopathic Scoliosis ◽  
Spinal Canal ◽  
Three Dimensional ◽  
Dimensional Changes

scholarly journals MUSCLE DISORDERS IN ADOLESCENT IDIOPATHIC SCOLIOSIS: LITERATURE REVIEW

2016 ◽  
Vol 15 (1) ◽  
pp. 73-77 ◽  
Author(s):  
Débora Pinheiro Lédio Alves ◽  
Barbara de Araújo
Keyword(s):  
Adolescent Idiopathic Scoliosis ◽  
Literature Review ◽  
Idiopathic Scoliosis ◽  
Three Dimensional ◽  
Emg Activity ◽  
Muscle Disorders ◽  
Dimensional Changes ◽  
Manual Search ◽  
National Databases ◽  
Keywords Scoliosis

ABSTRACT Scoliosis is characterized by three-dimensional changes of the spine and is estimated to be present in 4% of the population worldwide. The most common form is the adolescent idiopathic. The purpose of this study is to identify the major muscle abnormalities found in patients with adolescent idiopathic scoliosis through a literature review. We conducted an electronic search of the national databases PubMed, Lilacs, PEDro, and EMBASE using the keywords "scoliosis", "biomechanics", "exercise", "physical therapy specialty", "idiopathic", and "muscles", from January 2003 to April 2015. The most relevant articles in English, Portuguese and Spanish were selected by title and abstract. It was also performed a manual search of the references of the selected articles. From a total of 4,319 articles, 11 were selected. We conclude that individuals with AIS have changes in the paraspinal muscles, with a difference in activation between the concave and convex sides, suggesting an increase in EMG activity on the convex side, although there is still no consensus among the authors.

A noncontact method for three-dimensional analysis of vascular elasticity in vivo and in vitro

1976 ◽  
Vol 40 (4) ◽  
pp. 634-637 ◽  
Author(s):  
K. Fronek ◽  
G. Schmid-Schoenbein ◽  
Y. C. Fung
Keyword(s):  
Vessel Wall ◽  
Three Dimensional ◽  
Pressure Change ◽  
New Method ◽  
Intraluminal Pressure ◽  
End Effects ◽  
Dimensional Changes ◽  
Analog Voltage

A new method is described to measure the deformation of the blood vessel wall simultaneously in longitudinal and circumferential directions. This information is of paramount importance for further characterization of the elastic properties of the arterial wall. The new method consists of a closed-circuit TV system in conjunction with a video dimension analyzer (VDA). The VDA utilizes the video signal from the TV camera and forms a DC voltage proportional to the distance between two selected points in the scene. The resulting analog voltage, calibrated in dimensional units, is recorded. Dimensional changes in two directions, due to intraluminal pressure oscillations, are tracked continuously. The measurement can be performed in vivo on exposed vessels as well as in vitro on excised specimens. Distortion caused by the end effects is completely eliminated. For further data analysis, the wall thickness of the artery is determined microscopically. Stress and strain relationship in longitudinal and circumferential directions is calculated for every intraluminal pressure change. This approach yields data on mechanical properties of the vessel wall in a far more physiological way than the hitherto used direct-contact techniques.

scholarly journals Comparative Study between a Novel In Vivo Method and CBCT for Assessment of Ridge Alterations after Socket Preservation—Pilot Study

2019 ◽  
Vol 16 (1) ◽  
pp. 127
Author(s):  
Vasilena Ivanova ◽  
Ivan Chenchev ◽  
Stefan Zlatev ◽  
Georgi Iordanov ◽  
Eitan Mijiritsky
Keyword(s):  
Alveolar Bone ◽  
Three Dimensional ◽  
Radiographic Examination ◽  
Ridge Preservation ◽  
Alveolar Ridge ◽  
Socket Preservation ◽  
Dimensional Changes ◽  
Average Value ◽  
Alveolar Ridge Preservation

The aim of this study was to compare two different methods for evaluation of alveolar bone resorption after the socket preservation procedure. In the current study, 9 patients with a total of nine teeth indicated for extraction were included. Patients received alveolar ridge preservation with allograft (BoneAlbumin™, OrthoSera Dental, Gyor, Hungary) or Platelet-Rich fibrin (PRF). CBCT (Planmeca ProMax 3D, Helsinki, Finland), was taken at 1 week and 4 months after the socket preservation procedure. A 3D scan, obtained with Trios (3Shape, Copenhagen, Denmark) of the alveolar bone of the surgical site and the adjacent teeth at the place of extraction was performed during the surgical procedure, immediately after the graft placement in the alveolar socket, and after 4 months. Virtual study models were generated using the three-dimensional file processing software “Meshlab” (ISTI—CNR Rome Italy). The changes of alveolar height and width were measured and analyzed. Results were taken from both methods. Radiographic examination revealed that the average value of horizontal resorption is 0.6–2.4 mm, and vertical resorption is 0.46–2.8 mm. On virtual models, the average value for horizontal resorption is 1.92–3.64 mm, the vertical resorption value is 0.95–2.10 mm. The Trios intraoral scan can provide non-invasive and more accurate quantitative insights into the dimensional changes in the alveolar ridge after the bone remodeling process. More research is needed for verification of these results.

scholarly journals Preoperative and early postoperative three-dimensional changes of the rib cage after posterior instrumentation in adolescent idiopathic scoliosis

2000 ◽  
Vol 10 (2) ◽  
pp. 101-106 ◽  
Author(s):  
Sébastien Delorme ◽  
Philippe Violas ◽  
Jean Dansereau ◽  
Jacques de Guise ◽  
Carl-Éric Aubin ◽  
...  
Keyword(s):  
Adolescent Idiopathic Scoliosis ◽  
Idiopathic Scoliosis ◽  
Posterior Instrumentation ◽  
Three Dimensional ◽  
Rib Cage ◽  
Dimensional Changes

scholarly journals In vivo three-dimensional segmental analysis of adolescent idiopathic scoliosis

2011 ◽  
Vol 20 (10) ◽  
pp. 1745-1750 ◽  
Author(s):  
Takako Hattori ◽  
Hironobu Sakaura ◽  
Motoki Iwasaki ◽  
Yukitaka Nagamoto ◽  
Hideki Yoshikawa ◽  
...  
Keyword(s):  
Adolescent Idiopathic Scoliosis ◽  
Idiopathic Scoliosis ◽  
Three Dimensional ◽  
Segmental Analysis

scholarly journals Reproducibility of Newly Developed Spinal Topography Measurements for Scoliosis

2012 ◽  
Vol 6 (1) ◽  
pp. 226-230 ◽  
Author(s):  
Leah Rankine ◽  
Xue C Liu ◽  
Channing Tassone ◽  
Roger Lyon ◽  
Sergey Tarima ◽  
...  
Keyword(s):  
Idiopathic Scoliosis ◽  
Intraclass Correlation ◽  
Three Dimensional ◽  
Correlation Coefficients ◽  
X Rays ◽  
Contour Analysis ◽  
Rater Reliability ◽  
Dimensional Changes ◽  
Significant Variability ◽  
Q Angle

Objective: In an effort to limit exposure to ionizing radiation and fully characterize three dimensional changes in the spine of patients with scoliosis reliable non-invasive methods of spinal back contour analysis (Milwaukee Topographic Scanner) (MTS) have been developed. Study Design: The current study compares spinal topography measurements among different subject positions and evaluates the reproducibility of the system for both inter-rater and intra-rater reliability. Methods: A dummy cast (plastic cast) of one patient with adolescent idiopathic scoliosis was created in order to test the reliability of the MTS. The dummy cast was positioned and rotated in 3D while scanned by two investigators using the MTS. A total of twelve parameters including Q-angle (an analog to X-ray’s Cobb angle) were extracted. Results: All measurements of intra-rater and inter-rater reliability were excellent (Intraclass Correlation Coefficients ranging from 0.89 to 0.99) with the exception of Pelvic Tilt (intra-rater ICC is 0.61) and lordosis angle (inter-rater ICC is 0.82). No significant variability among investigators was observed for all tested metrics. No significant variability due to position was observed for the majority of back contour measurements but there were significant changes in the T1-S1 angle, T1-S1 deviation, T1-NC angle, T1-NC deviation, and Back Height metric (p< 0.05). Conclusions: The MTS is a reliable method of raster stereography in the measurement of the back contour, which will help monitor the progression of children with idiopathic scoliosis and reduce the use of X-rays.

scholarly journals In vivo deformation of anatomically pre-bent rods in thoracic adolescent idiopathic scoliosis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hideki Sudo ◽  
Hiroyuki Tachi ◽  
Terufumi Kokabu ◽  
Katsuhisa Yamada ◽  
Akira Iwata ◽  
...  
Keyword(s):  
Adolescent Idiopathic Scoliosis ◽  
Idiopathic Scoliosis ◽  
Demographic Data ◽  
Three Dimensional ◽  
Anatomical Reconstruction ◽  
Consecutive Series ◽  
Radiographic Measurements ◽  
Patient Demographic Data ◽  
Posterior Correction

AbstractSome surgical strategies can maintain or restore thoracic kyphosis (TK); however, next-generation surgical schemes for adolescent idiopathic scoliosis (AIS) should consider anatomical corrections. A four-dimensional correction could be actively achieved by curving the rod. Thus, anatomically designed rods have been developed as notch-free, pre-bent rods for easier anatomical reconstruction. This study aimed to compare the initial curve corrections obtained using notch-free rods and manually bent, notched rods for the anatomical reconstruction of thoracic AIS. Two consecutive series of 60 patients who underwent anatomical posterior correction for main thoracic AIS curves were prospectively followed up. After multilevel facetectomy, except for the lowest instrumented segment, either notch-free or notched rods were used. Patient demographic data, radiographic measurements, and sagittal rod angles were analyzed within 1 week after surgery. Patients with notch-free rods had significantly higher postoperative TK than patients with notched rods (P < .001), but both groups achieved three-dimensional spinal corrections and significantly increased postoperative rates of patients with T6–T8 TK apex (P = .006 for notch-free rods and P = .008 for notched rods). The rod deformation angle at the concave side was significantly lower in the notch-free rods than in the notched rods (P < .001). The notch-free, pre-bent rod can maintain its curvature, leading to better correction or maintenance of TK after anatomical spinal correction surgery than the conventional notched rod. These results suggest the potential benefits of anatomically designed notch-free, pre-bent rods over conventional, manually bent rods.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

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