A Database for Estimating Normal Spinal Motion Derived From Noninvasive Measurements

Spine ◽  
1995 ◽  
Vol 20 (9) ◽  
pp. 1036-1046 ◽  
Author(s):  
Serge Gracovetsky ◽  
Nicholas Newman ◽  
Marc Pawlowsky ◽  
Victor Lanzo ◽  
Bruce Davey ◽  
...  
Keyword(s):  
Spinal Motion ◽  
Noninvasive Measurements

scholarly journals Noninvasive Assessment of Neuromechanical Coupling and Mechanical Efficiency of Parasternal Intercostal Muscle during Inspiratory Threshold Loading

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1781
Author(s):  
Manuel Lozano-García ◽  
Luis Estrada-Petrocelli ◽  
Abel Torres ◽  
Gerrard F. Rafferty ◽  
John Moxham ◽  
...  
Keyword(s):  
Mechanical Efficiency ◽  
Intercostal Muscle ◽  
Wireless Devices ◽  
Clinical Value ◽  
Intercostal Muscles ◽  
Noninvasive Measurements ◽  
Standard Assessment ◽  
Mouth Pressure ◽  
Invasive Techniques ◽  
Increasing Load

This study aims to investigate noninvasive indices of neuromechanical coupling (NMC) and mechanical efficiency (MEff) of parasternal intercostal muscles. Gold standard assessment of diaphragm NMC requires using invasive techniques, limiting the utility of this procedure. Noninvasive NMC indices of parasternal intercostal muscles can be calculated using surface mechanomyography (sMMGpara) and electromyography (sEMGpara). However, the use of sMMGpara as an inspiratory muscle mechanical output measure, and the relationships between sMMGpara, sEMGpara, and simultaneous invasive and noninvasive pressure measurements have not previously been evaluated. sEMGpara, sMMGpara, and both invasive and noninvasive measurements of pressures were recorded in twelve healthy subjects during an inspiratory loading protocol. The ratios of sMMGpara to sEMGpara, which provided muscle-specific noninvasive NMC indices of parasternal intercostal muscles, showed nonsignificant changes with increasing load, since the relationships between sMMGpara and sEMGpara were linear (R2 = 0.85 (0.75–0.9)). The ratios of mouth pressure (Pmo) to sEMGpara and sMMGpara were also proposed as noninvasive indices of parasternal intercostal muscle NMC and MEff, respectively. These indices, similar to the analogous indices calculated using invasive transdiaphragmatic and esophageal pressures, showed nonsignificant changes during threshold loading, since the relationships between Pmo and both sEMGpara (R2 = 0.84 (0.77–0.93)) and sMMGpara (R2 = 0.89 (0.85–0.91)) were linear. The proposed noninvasive NMC and MEff indices of parasternal intercostal muscles may be of potential clinical value, particularly for the regular assessment of patients with disordered respiratory mechanics using noninvasive wearable and wireless devices.

scholarly journals Minimally invasive techniques in spinal surgery: current practice

1998 ◽  
Vol 4 (2) ◽  
pp. E10 ◽  
Author(s):  
Parviz Kambin ◽  
Thomas Gennarelli ◽  
Frank Hermantin
Keyword(s):  
Minimally Invasive ◽  
Spinal Surgery ◽  
Current Practice ◽  
Herniated Disc ◽  
Operative Techniques ◽  
Spinal Motion ◽  
Minimally Invasive Spinal Surgery ◽  
Epidural Steroid ◽  
Visual Diagnosis ◽  
Invasive Techniques

Minimally invasive spinal surgery under arthroscopic or endoscopic magnification and illumination is emerging as an alternative, reliable method of treatment in a variety of spinal disorders. The operative techniques being used for discectomy and retrieval of herniated disc fragments or stabilization of unstable spinal motion segments are being utilized for visual diagnosis and debridement of infectious discitis and osteomyelitis transpedicular and transforaminal vertebral body biopsy, temporary diagnostic fixation of unstable lumbar motion segments, and transforaminal epidural steroid therapy.

scholarly journals Intuitive assessment of modeled lumbar spinal motion by clustering and visualization of finite helical axes

2021 ◽  
pp. 104528
Author(s):  
Robert RockenfellerCor ◽  
Maria Hammer ◽  
Julia Riede ◽  
Syn Schmitt ◽  
Kai Lawonn
Keyword(s):  
Spinal Motion ◽  
Lumbar Spinal

Is intervertebral disc degeneration related to segmental instability? An evaluation with two different grading systems based on clinical imaging

2017 ◽  
Vol 59 (3) ◽  
pp. 327-335 ◽  
Author(s):  
David Volkheimer ◽  
Fabio Galbusera ◽  
Christian Liebsch ◽  
Sabine Schlegel ◽  
Friederike Rohlmann ◽  
...  
Keyword(s):  
Intervertebral Disc Degeneration ◽  
Statistical Significance ◽  
Axial Rotation ◽  
Spinal Motion ◽  
X Ray ◽  
Grading Systems ◽  
Flexion Extension ◽  
The Difference ◽  
Magnetic Resonance Imaging Mri

Background Several in vitro studies investigated how degeneration affects spinal motion. However, no consensus has emerged from these studies. Purpose To investigate how degeneration grading systems influence the kinematic output of spinal specimens. Material and Methods Flexibility testing was performed with ten human T12-S1 specimens. Degeneration was graded using two different classifications, one based on X-ray and the other one on magnetic resonance imaging (MRI). Intersegmental rotation (expressed by range of motion [ROM] and neutral zone [NZ]) was determined in all principal motion directions. Further, shear translation was measured during flexion/extension motion. Results The X-ray grading system yielded systematically lesser degeneration. In flexion/extension, only small differences in ROM and NZ were found between moderately degenerated motion segments, with only NZ for the MRI grading reaching statistical significance. In axial rotation, a significant increase in NZ for moderately degenerated segments was found for both grading systems, whereas the difference in ROM was significant only for the MRI scheme. Generally, the relative increases were more pronounced for the MRI classification compared to the X-ray grading scheme. In lateral bending, only relatively small differences between the degeneration groups were found. When evaluating shear translations, a non-significant increase was found for moderately degenerated segments. Motion segment segments tended to regain stability as degeneration progressed without reaching the level of statistical significance. Conclusion We found a fair agreement between the grading schemes which, nonetheless, yielded similar degeneration-related effects on intersegmental kinematics. However, as the trends were more pronounced using the Pfirrmann classification, this grading scheme appears superior for degeneration assessment.

Comparison of supine and prone noninvasive measurements of breathing patterns in fullterm newborns

1994 ◽  
Vol 18 (1) ◽  
pp. 8-12 ◽  
Author(s):  
Jose A. Adams ◽  
Ignacio A. Zabaleta ◽  
Marvin A. Sackner
Keyword(s):  
Breathing Patterns ◽  
Noninvasive Measurements

Quantificationofwallshearstressinlargebloodvesselsusingmagneticresonanceimaging

2019 ◽  
Author(s):  
  Нина Юрьевна Шокина ◽  
  Габриэль Тешнер ◽  
  Андреас Бауэр ◽  
  Камерон Тропеа ◽  
  Херберт Эггер ◽  
...  
Keyword(s):  
Cardiovascular Mri ◽  
Resonance Imaging ◽  
Noninvasive Measurements ◽  
Potential Biomarker ◽  
Flowing Blood ◽  
Fully Automatic ◽  
Nonlinear Regression Method ◽  
Magnetic Resonance Imaging Mri ◽  
Blood Flow Velocities

Напряжение сдвига на стенке количественно определяет силу трения течения крови о стенки сосудов. Магнитнорезонансная томография (МРТ) позволяет проводить неинвазивные измерения скорости течения крови, которая требуется для вычисления напряжения сдвига на стенке. В статье представлено введение в квантификацию напряжения сдвига на стенках больших кровеносных сосудов с помощью МРТ. Рассмотрены роль напряжения сдвига на стенке как потенциального биомаркера сердечнососудистых заболеваний, сердечнососудистая МРТ, методы квантификации напряжения на стенке с помощью МРТ, их точность и валидация. В качестве примера представлен универсальный метод нелинейной регрессии для квантификации напряжения сдвига на стенке с помощью МРТ для полностью развившихся турбулентных течений в трубах. Новый, полностью автоматический и быстрый локальный метод даёт точные оценки независимо от пространственного разрешения и может служить надёжным эталонным методом для валидации более обобщённых методов оценки напряжения сдвига на стенке перед их клиническим применением. Wall shear stress (WSS) quantifies the frictional force that flowing blood exerts on a vessel wall. Magnetic Resonance Imaging (MRI) enables noninvasive measurements of blood flow velocities that are needed for WSS computation. An introduction into MRIbased WSS quantification in large blood vessels is presented. The possible role of WSS as a potential biomarker in cardiovascular diseases, cardiovascular MRI, MRbased WSS quantification methods, and their accuracy and validation are considered. As an example, the generic nonlinear regression method for MRIderived WSS quantification in fully developed turbulent stationary pipe flows is presented. The new method is a fully automatic and fast local WSS estimator, which produces accurate estimates independent from the spatial resolution of the measurement and may serve as a reliable reference for validation of more generic WSS estimators prior to their clinical applications.

Wednesday, September 26, 2018 3:35 PM – 5:05 PM Preserving Spinal Motion

2018 ◽  
Vol 18 (8) ◽  
pp. S44-S45
Author(s):  
Justin V. Bundy ◽  
Mir H. Ali ◽  
Todd M. Chapman ◽  
Isaac O. Karikari ◽  
Eric B. Laxer ◽  
...  
Keyword(s):  
Spinal Motion

Wednesday, September 26, 2018 3:35 PM – 5:05 PM Preserving Spinal Motion

2018 ◽  
Vol 18 (8) ◽  
pp. S43
Author(s):  
Scott L. Blumenthal ◽  
Donna D. Ohnmeiss
Keyword(s):  
Spinal Motion

scholarly journals Multiscale modelling of the human lumbar facet capsular ligament: analysing spinal motion from the joint to the neurons

2018 ◽  
Vol 15 (148) ◽  
pp. 20180550
Author(s):  
Vahhab Zarei ◽  
Rohit Y. Dhume ◽  
Arin M. Ellingson ◽  
Victor H. Barocas
Keyword(s):  
Axial Rotation ◽  
Fe Model ◽  
Spinal Motion ◽  
Capsular Ligament ◽  
Segment Model ◽  
Motion Segment ◽  
Flexion Extension ◽  
Vertebral Kinematics ◽  
High Level ◽  
Lumbar Facet

Due to its high level of innervation, the lumbar facet capsular ligament (FCL) is suspected to play a role in low back pain (LBP). The nociceptors in the lumbar FCL may experience excessive deformation and generate pain signals. As such, understanding the mechanical behaviour of the FCL, as well as that of its underlying nerves, is critical if one hopes to understand its role in LBP. In this work, we constructed a multiscale structure-based finite-element (FE) model of a lumbar FCL on a spinal motion segment undergoing physiological motions of flexion, extension, ipsilateral and contralateral bending, and ipsilateral axial rotation. Our FE model was created for a generic FCL geometry by morphing a previously imaged FCL anatomy onto an existing generic motion segment model. The fibre organization of the FCL in our models was subject-specific based on previous analysis of six dissected specimens. The fibre structures from those specimens were mapped onto the FCL geometry on the motion segment. A motion segment model was used to determine vertebral kinematics under specified spinal loading conditions, providing boundary conditions for the FCL-only multiscale FE model. The solution of the FE model then provided detailed stress and strain fields within the tissue. Lastly, we used this computed strain field and our previous studies of deformation of nerves embedded in fibrous networks during simple deformations (e.g. uniaxial stretch, shear) to estimate the nerve deformation based on the local tissue strain and fibre alignment. Our results show that extension and ipsilateral bending result in largest strains of the lumbar FCL, while contralateral bending and flexion experience lowest strain values. Similar to strain trends, we calculated that the stretch of the microtubules of the nerves, as well as the forces exerted on the nerves' membrane are maximal for extension and ipsilateral bending, but the location within the FCL of peak microtubule stretch differed from that of peak membrane force.

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