Correlation Analysis Among Cervical Disc Height,Cervical Disc Angle And Cervical Lordosis

Objective: To investigate the correlation between the cervical disc height and cervical disc angle of patients with cervical spondylosis myelopathy(CSM)and their cervical lordosis.Methods: Retrospective analysis was carried out targeting on 212 cases of CSM patients(133 men and 79 women)who received surgery in The First Hospital of China Medical University from 2007 to 2016,with an average age of 54.46±10.029 years.“Surgimap”was used to measure the cervical disc height and cervical disc angle.The experimental data was divided into two groups in light of the quantitative indicator of cervical lordosis,namely the C2-C7 cobb angle.With the mean value being calculated,differences between cervical disc height and cervical disc angle of the intra-group and those of the inter-group were compared.Pearson correlation analysis was adopted to reveal the correlation between variables(including gender and age)like cervical disc height and cervical disc angle and the C2-C7 cobb angle.Multiple linear regression was utilized to analyze the influence of each variable upon the C2-C7 cobb angle.Results: The cervical disc angle of all levels were higher in Group 2 that in Group 1;in both groups,the cervical disc height and cervical disc angle gradually increased from the upper level to the lower level,while narrowed at the level C5-C6.The cervical disc height of each group of is smaller than the normal value.The cervical disc angles of the three fractures of C4-5,C5-6 and C6-7 are also compared with the normal values.Subscribe comprehensive data of each group and compared with the normal value,which are found that cervical spondylotic myelopathy in each segment of the cervical disc has a certain degree of degenerative changes,but the C5-6 disc degeneration is the most serious.The cervical disc height of the level C6-C7 showed no correlation between the C2-C7 cobb angle(p>0.05),but the cervical disc heights and cervical disc angles of levels C2-C3,C3-C4,C4-C5 and C5-C6 and the cervical disc angle of the level C6-C7 formed certain correlation between the C2-C7 cobb angle(p<0.05),among which the cervical disc angles of the level C3-C4(r=0.460,p<0.05)and the level C4-C5(r=0.420,p<0.05)had the most correlation between the C2-C7 cobb angle.In addition,there was certain correlation between variables like the age and the cervical lordosis.When the C2-C7 cobb angle was less than or equal to 10°,the cervical disc angle at the C4-C5 level made the greatest contribution to the C2-C7 cobb angle(p?0.003);when the C2-C7 cobb angle was more than 10°,the cervical disc angle at the C3-C4 level had the most contribution to the C2-C7 cobb angle(p?0.006).Conclusion: Cervical Disc Angle contributed more to cervical curvature than Cervical Disc height in patients with cervical spondylotic myelopathy,among which intervertebral Angle formation in c3-4 and c4-5 segments contributed the most to cervical curvature.Age was associated with cervical curvature in patients with cervical spondylotic myelopathy.