scholarly journals Comparison of three approaches for defining nucleus pulposus and annulus fibrosus on sagittal magnetic resonance images of the lumbar spine

2016 ◽  
Vol 6 ◽  
pp. 34-41 ◽  
Author(s):  
Greta S.P. Mok ◽  
Duo Zhang ◽  
Shu-Zhong Chen ◽  
Jing Yuan ◽  
James F. Griffith ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Magnetic Resonance ◽  
Nucleus Pulposus ◽  
Annulus Fibrosus ◽  
Magnetic Resonance Images

3D segmentation of annulus fibrosus and nucleus pulposus from T2-weighted magnetic resonance images

2014 ◽  
Vol 59 (24) ◽  
pp. 7847-7864 ◽  
Author(s):  
Isaac Castro-Mateos ◽  
Jose M Pozo ◽  
Peter E Eltes ◽  
Luis Del Rio ◽  
Aron Lazary ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Nucleus Pulposus ◽  
Annulus Fibrosus ◽  
Magnetic Resonance Images ◽  
3D Segmentation

Disc Mechanics With Trans-Endplate Partial Nucleotomy are not Fully Restored Following Cyclic Compressive Loading and Unloaded Recovery

2006 ◽  
Vol 128 (6) ◽  
pp. 823-829 ◽  
Author(s):  
Edward J. Vresilovic ◽  
Wade Johannessen ◽  
Dawn M. Elliott
Keyword(s):  
Cyclic Loading ◽  
Stress Relaxation ◽  
Nucleus Pulposus ◽  
Time Constant ◽  
Annulus Fibrosus ◽  
Compressive Loading ◽  
Magnetic Resonance Images ◽  
Mechanical Behaviors ◽  
Short Time

Mechanical function of the intervertebral disc is maintained through the interaction between the hydrated nucleus pulposus, the surrounding annulus fibrosus, and the superior and inferior endplates. In disc degeneration the normal transfer of load between disc substructures is compromised. The objective of this study was to explore the mechanical role of the nucleus pulposus in support of axial compressive loads over time. This was achieved by measuring the elastic slow ramp and viscoelastic stress-relaxation mechanical behaviors of cadaveric sheep motion segments before and after partial nucleotomy through the endplate (keeping the annulus fibrosus intact). Mechanics were evaluated at five conditions: Intact, intact after 10,000cycles of compression, acutely after nucleotomy, following nucleotomy and 10,000cycles of compression, and following unloaded recovery. Radiographs and magnetic resonance images were obtained to examine structure. Only the short time constant of the stress relaxation was altered due to nucleotomy. In contrast, cyclic loading resulted in significant and large changes to both the stiffness and stress relaxation behaviors. Moreover, the nucleotomy had little to no effect on the disc mechanics after cyclic loading, as there were no significant differences comparing mechanics after cyclic loading with or without the nucleotomy. Following unloaded recovery the mechanical changes that had occurred as a consequence of cyclic loading were restored, leaving only a sustained change in the short time constant due to the trans-endplate nucleotomy. Thus the swelling and redistribution of the remaining nucleus pulposus was not able to fully restore mechanical behaviors. This study reveals insights into the role of the nucleus pulposus in disc function, and provides new information toward the potential role of altered nucleus pulpous function in the degenerative cascade.

Intertester Reliability and Validity of Motion Assessments During Lumbar Spine Accessory Motion Testing

2008 ◽  
Vol 88 (1) ◽  
pp. 43-49 ◽  
Author(s):  
Rob Landel ◽  
Kornelia Kulig ◽  
Michael Fredericson ◽  
Bernard Li ◽  
Christopher M Powers
Keyword(s):  
Lumbar Spine ◽  
Magnetic Resonance ◽  
Sagittal Plane ◽  
Magnetic Resonance Images ◽  
Segmental Motion ◽  
Segmental Mobility ◽  
Spine Motion ◽  
Mobile Segment ◽  
Good Agreement

Background and PurposePosterior-anterior (PA) assessment of the lumbar spine correlates with radiographic signs of instability and can guide treatment choices, yet studies of the validity of lumbar PA assessments have not been conducted in vivo. The purposes of this study were to determine the intertester reliability of the PA examination in assessing intersegmental lumbar spine motion and to evaluate the validity of this procedure in vivo with dynamic magnetic resonance imaging (MRI).SubjectsTwenty-nine subjects with central lumbar pain participated in this study.MethodsTwo physical therapists independently identified each subject's most and least mobile lumbar segments using the PA procedure. Midsagittal lumbar images were obtained simultaneously during one examiner's assessment. Lumbar segmental mobility was quantified from magnetic resonance images as the change in the intervertebral angle between the resting position and the end range of the PA force application. For each vertebral level tested, maximal sagittal-plane segmental motion was determined.ResultsThe intertester reliability for identifying the least mobile segment was good (agreement=82.8%, kappa=.71, 95% confidence interval [CI]=.48 to .94), but it was poor for identifying the most mobile segment (kappa=.29, 95% CI=−.13 to .71), despite good agreement (79.3%). The level of agreement between the PA assessments and intervertebral motion measured by MRI was poor (kappa=.04, 95% CI=−.16 to .24, and kappa=.00, 95% CI=−.09 to .08, for the least and most mobile segments, respectively).Discussion and ConclusionDespite good intertester reliability for identifying the least mobile segment, PA assessments of lumbar segmental mobility did not agree with sagittal-plane motion measured by dynamic MRI. This finding calls into question the validity of the PA procedure for assessing intervertebral lumbar spine motion.

scholarly journals Frequency-dependent shear properties of annulus fibrosus and nucleus pulposus by magnetic resonance elastography

2018 ◽  
Vol 31 (10) ◽  
pp. e3918 ◽  
Author(s):  
P.F. Beauchemin ◽  
P.V. Bayly ◽  
J.R. Garbow ◽  
J.L.S. Schmidt ◽  
R.J. Okamoto ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Nucleus Pulposus ◽  
Annulus Fibrosus ◽  
Magnetic Resonance Elastography ◽  
Shear Properties ◽  
Frequency Dependent

Agreement in the interpretation of magnetic resonance images of the lumbar spine

2009 ◽  
Vol 50 (5) ◽  
pp. 497-506 ◽  
Author(s):  
F. M. Kovacs ◽  
A. Royuela ◽  
T. S. Jensen ◽  
A. Estremera ◽  
G. Amengual ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Magnetic Resonance ◽  
Magnetic Resonance Images

Characterization of normal lumbar spine in Sudanese population using magnetic resonance images

2016 ◽  
Vol 11 (1) ◽  
pp. 19
Author(s):  
Mazin BabikirAbdullah Hassib ◽  
Mohammad ElfadilMohamed Garelnabi ◽  
Aida Abd ElkareemB Haraz
Keyword(s):  
Lumbar Spine ◽  
Magnetic Resonance ◽  
Magnetic Resonance Images

scholarly journals Deep Learning-Based Correlation Analysis between Spine Surgery Lumbar Facet Joint and Lumbar Disc Herniation Using Magnetic Resonance Images

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Chao Wang ◽  
Jiabin Yuan ◽  
Zebin Huang ◽  
Zhicai Shi
Keyword(s):  
Lumbar Spine ◽  
Magnetic Resonance ◽  
Lumbar Disc Herniation ◽  
Facet Joint ◽  
Lumbar Disc ◽  
Magnetic Resonance Images ◽  
Control Group ◽  
Lumbar Facet Joint ◽  
Lumbar Facet ◽  
Experimental Group

The research aimed at discussing the analytic function of convolutional neural network (CNN) algorithm-based magnetic resonance images (MRI) in the correlation between lumbar disc herniation (LDH) and angle and irregular variation of joint (IVJ) of lumbar facet-joint (LFJ). First, CNN-based MRI (CNNM) algorithm was constructed, and Markov random field (MRF) and fuzzy C-means (FCM) algorithms were introduced for comparison. Meanwhile, all patients received MRI examination of lumbar, and CNNM algorithm was adopted in MRI images. The results showed that the sensitivity, specificity, accuracy, and precision (98.53%, 93.65%, 99.56%, and 98.74%, respectively) of the CNNM algorithm were all superior to those of MRF algorithm (90.41%, 81.11%, 91.18%, and 91.13%, respectively) and of FCM algorithm (93.14%, 82.86%, 93.23%, and 93.08%, respectively) ( P < 0.05 ). Besides, the lumbar spine angles of L3-L4, L4-L5, and L5-S1 (6.03 ± 1.34°, 7.14 ± 1.18°, and 8.96 ± 3.26°, respectively) in the experimental group was obviously less than those in the control group (6.84 ± 1.15°, 9.85 ± 1.25°, and 17.34 ± 4.79°, respectively) ( P < 0.05 ). In the experimental group, there was irregular mutation of LFJ in 78 cases, while 8 cases suffered from irregular mutation of LFJ in the control group. The proportions of protrusion in L3/4, L4/5, and L5/S1 segments (11 cases, 53 cases, and 14 cases, respectively) was higher than that in the control group (1 case, 5 cases, and 2 cases, respectively) ( P < 0.05 ). In short, the constructed CNNM algorithm had excellent performance in diagnosing lumbar MRI images and had clinical research and promotion value. Moreover, the IVJ of patients with LDH was notably increased, most of the physiological angle of the lumbar spine changed, and facet joint was correlated with the occurrence of LDH.

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