scholarly journals Locating the Instant Center of Rotation in the Subaxial Cervical Spine with Biplanar Fluoroscopy during In Vivo Dynamic Flexion-Extension

2019 ◽  
Vol 11 (4) ◽  
pp. 482
Author(s):  
Seong Hwan Kim ◽  
Dae Woong Ham ◽  
Jeong Ik Lee ◽  
Seung Won Park ◽  
Myeong Jin Ko ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Center Of Rotation ◽  
Subaxial Cervical Spine ◽  
Flexion Extension ◽  
Biplanar Fluoroscopy

scholarly journals Motion Path of the Instant Center of Rotation in the Cervical Spine During In Vivo Dynamic Flexion-Extension

Spine ◽  
2013 ◽  
Vol 38 (10) ◽  
pp. E594-E601 ◽  
Author(s):  
William Anderst ◽  
Emma Baillargeon ◽  
William Donaldson ◽  
Joon Lee ◽  
James Kang
Keyword(s):  
Cervical Spine ◽  
Motion Path ◽  
Center Of Rotation ◽  
Flexion Extension

Comparison of the Kinematic Features Between the in vivo Active and Passive Flexion-Extension of the Subaxial Cervical Spine and Their Biomechanical Implications

Spine ◽  
2011 ◽  
Vol 36 (8) ◽  
pp. 630-638 ◽  
Author(s):  
Wen-Hsing Hsu ◽  
Yao-Liang Chen ◽  
Tai-Ngar Lui ◽  
Tzu-Yung Chen ◽  
Yung-Hsin Hsu ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Subaxial Cervical Spine ◽  
Flexion Extension ◽  
Passive Flexion

Canal Volume Changes in the Subaxial Cervical Spine during In Vivo Dynamic Flexion-Extension

2015 ◽  
Vol 15 (10) ◽  
pp. S184
Author(s):  
Haiqing Mao ◽  
Sean J. Driscoll ◽  
Shaobai Wang ◽  
Weiye Zhong ◽  
Guoan Li ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Volume Changes ◽  
Subaxial Cervical Spine ◽  
Flexion Extension

scholarly journals Dimensional changes of the neuroforamina in subaxial cervical spine during in vivo dynamic flexion-extension

2016 ◽  
Vol 16 (4) ◽  
pp. 540-546 ◽  
Author(s):  
Haiqing Mao ◽  
Sean J. Driscoll ◽  
Jing-Sheng Li ◽  
Guoan Li ◽  
Kirkham B. Wood ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Dimensional Changes ◽  
Subaxial Cervical Spine ◽  
Flexion Extension

In Vivo Motion Characteristics of the Lower Cervical Spine During Dynamic Weight-Bearing Flexion-Extension

2015 ◽  
Vol 15 (10) ◽  
pp. S183-S184
Author(s):  
Sean J. Driscoll ◽  
Haiqing Mao ◽  
Shaobai Wang ◽  
Weiye Zhong ◽  
Guoan Li ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Weight Bearing ◽  
Lower Cervical Spine ◽  
Dynamic Weight ◽  
Flexion Extension ◽  
Motion Characteristics

scholarly journals Continuous cervical spine kinematics during in vivo dynamic flexion-extension

2014 ◽  
Vol 14 (7) ◽  
pp. 1221-1227 ◽  
Author(s):  
William J. Anderst ◽  
William F. Donaldson ◽  
Joon Y. Lee ◽  
James D. Kang
Keyword(s):  
Cervical Spine ◽  
Spine Kinematics ◽  
Flexion Extension

Analysis of adjacent-segment cervical kinematics: the role of construct length and the dorsal ligamentous complex

2020 ◽  
Vol 32 (1) ◽  
pp. 15-22
Author(s):  
Daniel Lubelski ◽  
Andrew T. Healy ◽  
Prasath Mageswaran ◽  
Robb Colbrunn ◽  
Richard P. Schlenk
Keyword(s):  
Cervical Spine ◽  
Industrial Robot ◽  
Adjacent Segment ◽  
Segmental Motion ◽  
Lateral Mass ◽  
Subaxial Cervical Spine ◽  
Flexion Extension ◽  
Cervical Kinematics

OBJECTIVELateral mass fixation stabilizes the cervical spine while causing minimal morbidity and resulting in high fusion rates. Still, with 2 years of follow-up, approximately 6% of patients who have undergone posterior cervical fusion have worsening kyphosis or symptomatic adjacent-segment disease. Based on the length of the construct, the question of whether to extend the fixation system to undisrupted levels has not been answered for the cervical spine. The authors conducted a study to quantify the role of construct length and the terminal dorsal ligamentous complex in the adjacent-segment kinematics of the subaxial cervical spine.METHODSIn vitro flexibility testing was performed using 6 human cadaveric specimens (C2–T8), with the upper thoracic rib cage and osseous and ligamentous integrity intact. An industrial robot was used to apply pure moments and to measure segmental motion at each level. The authors tested the intact state, followed by 9 postsurgical permutations of laminectomy and lateral mass fixation spanning C2 to C7.RESULTSConstructs spanning a single level exerted no significant effects on immediate adjacent-segment motion. The addition of a second immobilized segment, however, created significant changes in flexion-extension range of motion at the supradjacent level (+164%). Regardless of construct length, resection of the terminal dorsal ligaments did not greatly affect adjacent-level motion except at C2–3 and C7–T1 (increasing by +794% and +607%, respectively).CONCLUSIONSDorsal ligamentous support was found to contribute significant stability to the C2–3 and C7–T1 segments only. Construct length was found to play a significant role when fixating two or more segments. The addition of a fused segment to support an undisrupted cervical level is not suggested by the present data, except potentially at C2–3 and C7–T1. The study findings emphasize the importance of the C2–3 segment and its dorsal support.

scholarly journals Ranges of Cervical Intervertebral Disc Deformation During an In Vivo Dynamic Flexion–Extension of the Neck

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Yan Yu ◽  
Haiqing Mao ◽  
Jing-Sheng Li ◽  
Tsung-Yuan Tsai ◽  
Liming Cheng ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Imaging System ◽  
Human Subjects ◽  
Three Dimensional ◽  
Cervical Disc ◽  
Significant Difference ◽  
Flexion Extension ◽  
Fluoroscopic Imaging ◽  
Magnetic Resonance Imaging Mri

While abnormal loading is widely believed to cause cervical spine disc diseases, in vivo cervical disc deformation during dynamic neck motion has not been well delineated. This study investigated the range of cervical disc deformation during an in vivo functional flexion–extension of the neck. Ten asymptomatic human subjects were tested using a combined dual fluoroscopic imaging system (DFIS) and magnetic resonance imaging (MRI)-based three-dimensional (3D) modeling technique. Overall disc deformation was determined using the changes of the space geometry between upper and lower endplates of each intervertebral segment (C3/4, C4/5, C5/6, and C6/7). Five points (anterior, center, posterior, left, and right) of each disc were analyzed to examine the disc deformation distributions. The data indicated that between the functional maximum flexion and extension of the neck, the anterior points of the discs experienced large changes of distraction/compression deformation and shear deformation. The higher level discs experienced higher ranges of disc deformation. No significant difference was found in deformation ranges at posterior points of all the discs. The data indicated that the range of disc deformation is disc level dependent and the anterior region experienced larger changes of deformation than the center and posterior regions, except for the C6/7 disc. The data obtained from this study could serve as baseline knowledge for the understanding of the cervical spine disc biomechanics and for investigation of the biomechanical etiology of disc diseases. These data could also provide insights for development of motion preservation surgeries for cervical spine.

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