The Study Of Related Parametric Measurements During Cervical Dynamic X-ray Examination And Its Significance

Objective:To analyze the angular displacement and activity changes of each cervical segment in the young and old man, measuring and comparing the cervical curvature angle and intervertebral space height ratio with the method of dynamic X-ray examination.Then discuss the diagnostic value of dynamic X-ray imaging for early cervical disease.Subjects and methods:The subjects were divided into two groups,group A, young group (<35years old),20case,10cases of each sex, with an average age of28.3±4.41; group B, The old group (>60years old):20Cases,10cases of each sex, with an average age of65.4±3.58.Frame grabber was put into the computer, the computer system was windows XP system.The image output of the Shimadzu digital gastrointestinal machine was connected to the computer, and then record the consequence images from flexion to extension under the conditions of fluoroscopy and then uptake of cervical lateral as standard,The recorded image is stored within the computer. Method as follows①Select six images from the neck flexion and neck extension respectively and measuring the angular displacement of each segment of the cervical spine, the dynamic changes of angular displacement in each cervical segment are observed and the the range of motion of each cervical segment is compared②Calculating the average total activity of each cervical segment in1/2flexion to the neutral position,and the neutral position to1/2hyperextension,then compared between the two groups.③Measuring the cervical curvature angle in the standard lateral position and then compared between the two groups④Measure the intervertebral frontal height、middle height and hindered height of C5/6and C4/5in the1/2flexion, neutral position and1/2hyperextension and the height of the fifth and sixth cervical vertebrae height, calculate the ratio of C4/5intervertebral height with the fifth cervical vertebrae height, the ratio of C5/6intervertebral height with the sixth cervical vertebrae height,and the compare the ratio.Results:①The angular displacement of each cervical segment are gradually decreasing during1/2flexion to neutral position,The angular displacement of each cervical segment are gradually increasing during neutral position to1/2extension. ②The angular displacement of each cervical segment in the young group is greater than in the old group during the observed cervical range of motion(ROM);the angular displacement of each cervical segment in extension position is higher than in flexion position.③The cervical segment average activity and the average total activity present significance during1/2flexion to neutral position in the young group,the cervical4/5segment has the maximum activity.④The average activity and average total activity in the young group is greater than in the old group only in the cervical4/5segment.⑤The difference exits only in the intervertebral frontal height、middle space height ratio in1/2extension of cervical4/5segment and in the segment of C5/6,the difference exits in all except for the intervertebral frontal height、middle space height ratio in neutral position.⑥Cervical curvature angle exit statistical difference between the two groups,which is greater in the young group than in the old group.Conclusion:①Dynamic X-ray examination of the cervical spine can be a good assessment of each cervical segment movement.②Extension position can be more meaningful when observed the cervical spine instability by angular displacement.③The angular displacement of each cervical segment in the young man is greater than in the old man, to determine the cervical spine instability by White method,age factor should be considered.④The cervical4/5segment has the maximum activity in the young group,which exits statistical difference compared with the old group,the cervical4/5segment should be concerned when evaluating early cervical disc degeneration by cervical activity.⑤Dynamic measurement of the5/6intervertebral space has a great value to assess the cervical degenerative changes.⑥Cervical curvature angle can be used to assess early degenerative changes in the cervical spine.