The Value Of The Ratio With Cervical Spinal Cord And Cervical Spinal Canal Sagittal Diameter On Cervical Spondylotic Myelopathy

Objective: To explore the application value and clinical significance of thecervical spinal cord and cervical spinal canal sagittal diameter ratio in the cervicalspondylotic myelopathy(CSM) associated with cervical stenosis. Searching for the otherquantitative indicators reflecting spinal stenosis degree of CSM，Provide a reference forclinical evaluation of the degree of spinal canal stenosis reflecting the pathologicalchanges in cervical spondylotic myelopathy.Methods: Recalling and analyzing the patients suffered from cervical spondyloticmyelopathy(CSM) associated with cervical stenosis with the treatment of spinal surgicalward of our hospital in May2011-March2012,to measure cervical spinal cord and spinal canal sagittal diameter of C3-C7onMRI and X-ray and calculate the ratio.The patients with don’t have chief complaint ofCSM were randomly selected from the database of the MRI room as a control group.The patients with cervical spondylotic myelopathy(CSM) associated with cervicalstenosis were collected a total of30cases,20males and10females, age between39-60years old, average56.1years old.The patients in the control group were collected a totalof10cases,6males and4females, aged between20-55years old, average42.1yearsold.To measure the spinal canal sagittal diameter (A) of C3-C7(The points of themost seriously hyperplasia in the lower edge of vertebral body with the correspondinglamina spinous process connection) and the spinal cord sagittal diameter ofcorresponding plane on computer by X-ray and MRI, each segment measured twice andaveraged.The data of sagittal diameter with cervical spinal cord and spinal canal in CSM patients and normal measured in each segment were expressed as mean±S,respectively, calculate the ratio of the sagittal diameter with cervical spinal cord andspinal canal in each segment. Calculate three times, take the average, expressed asmean±S. In order to find the difference of the ratio in the normal group and CSM groupthrough employing two-sample independent t-test statistical processing in theSPSS16.0.Making use of linear bivariate Pearson correlation to analyze the relationshipof JOA score and the ratio of cervical spinal cord/spinal canal sagittal diameter.Results: The ratios of the cervical spinal cord and cervical spinal canal sagittaldiameter of C3-C6segments in CSM patients group respectively were0.51±0.02，0.61±0.04，0.62±0.05，0.59±0.06; The ratios of the cervical spinal cord and cervicalspinal canal sagittal diameter of C3-C6segments in normal control group respectivelywere0.44±0.02,0.44±0.01,0.40±0.26,0.40±0.02;The significant differences can befound through pairwise comparisons of the ratio between the two groups（.P＜0.05）Thecorrelation coefficient R of the ratio of the cervical spinal cord with cervical spinalcanal sagittal diameter of C3-C6segments and the JOA score in CSM patients grouprespectively were-0.710,-0.753,-0.761,-0.734, confirmed the negative correlationbetween the two groups, that is, the larger the ratio, the lower JOA score and the clinicalsymptoms and signs of the heavier.Conclusion:The severity of cervical spondylotic myelopathy can bequantitatively reflected by the ratio of the cervical spinal cord and cervical spinal canalsagittal diameter. The important indicator of surgical timing can be reflected by the ratioof the cervical spinal cord and cervical spinal canal sagittal diameter.