UNDERSTAND THE CERVICAL MECHANICS FROM MRI STUDIES

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The intervertebral motion measures were all interrelated. There was considerable variation in intervertebral motion. Intervertebral level and total gross rotation between C2 and C6 significantly affected all measures of intervertebral motion. Evaluating various aspects of intervertebral motion may improve the clinical efficacy & also will be helpful as the basis for understanding abnormal conditions.
A MRI studies reveal; in 3-D intervertebral motions of the subaxial cervical spine during head rotation; in healthy volunteers, following data

1. The subaxial cervical spine in maximum head rotation
a. Mean axial rotation with Maximum head rotation = 69.5 degrees.
b. C2-C3 = 2.2 degrees
c. C3-C4= 4.5 degrees
d. C4-C5= 4.6 degrees
e. C5-C6= 4.0 degrees
f. C6-C7= 1.6 degree
g. C7-T1= 1.5 degrees
2. Coupled lateral bending with axial rotation was observed in the same direction as axial rotation at all levels
h. C2-C3 = 3.6 degrees
i. C3-C4= 5.4 degrees
j. C4-C5= 5.0 degrees
k. C5-C6= 5.3 degrees
l. C6-C7= 4.9 degree
m. C7-T1= 1.2 degrees
3. Coupled extension with axial rotation occurred in the middle cervical region
n. C2-C3 = 1.4 degrees
o. C3-C4= 2.3 degrees
p. C4-C5= 1.5 degrees
4. Coupled flexion with axial rotation occurred in the lower cervical region
q. C5-C6= 0.9 degrees
r. C6-C7= 2.4 degree
s. C7-T1= 3.0 degrees
5. Mean maximum lateral bending of the cervical spine to one side was 1.6 degrees to 5.7 degrees at each level.
Coupled axial rotation opposite to lateral bending was observed in the upper cervical levels (Oc-C1, 0.2 degrees ; C1-C2, 17.1 degrees ), while in the subaxial cervical levels, it was observed in the same direction as lateral bending except for at C7-T1. Coupled flexion-extension motion was small at all vertebral levels (<1.1>

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