Lumber Intervertebral Discs Protrusion And When It Happen

ObjectivesLumber intervertebral discs protrusion has a high incidence rate. It can be caused by injury. The person concerned often hide the truth of the history of lumber intervertebral discs protrusion and become a handicap of forensic medicine evaluation. To identification when lumber intervertebral discs protrusion happen and how it happen is more and more important and urgentent. we will study clinical situation and MRI of lumber intervertebral discs protrusion , recording percentage changes of MRI signal intensity and other image characteristic. We will study MRI signal intensity of protruded nucleus pulposus , the size of protruded nucleus pulposus , discs hight, neural root compression degree ,thicken ligamenta flava ,discs degeneration degree, protrusion type and their relation with incident time.MethodsDivide the 70 pations into two groups: less than 2 monthes is one group, exceed 4 monthes is other group, record the evalue of MRI signal intensity the size of protruded nucleus pulposus , protrusion type, discs hight,dies degeneration degree, neural root compression degree thicken fligamenta flava. Do statistic analysis with SPSS11.0.1. Contrast the clinical situation between the two groups.2. Contrast the MRI between the two groups.(1) Do the correction analy between incident time and below entry: MRI signal intensity of protruded nucleus pulposus , the size of protroed nucleus pulposus ,the discs hight.(2)Do t - test between the two groups in the below entry: MRI signal intensity of protruded nucleus pulposus , the size of protruded nucleus pulposus ,the discs hight.(3)Do x2 - test between the two groups about the below entry: degeneration degree,neural root compression degree ,thicken ligamen-ta flava ,the type of the protrusion.Result1. The clinical situation difference between the two groups:(1) Between the two groups has a sharp difference in the positive of straight raise leg test, tendon reflect weaken and muscle strength weaken, the group of less than 2 monthes has a high positive rate in straight raise leg test. The group of exceed 4 monthes has a high positive rate in tendon reflect weaken and muscle strength weaken.(2) there is no difference between the two groups in the positive of sciatica, spine curvature, lumber spine tenderness, sensation abnormality.(3) All cases of less than 2 monthes has lumbag and hasnt mic-tion abnormality.2. The MRI difference between the two groups;(1) there is correlation between incident time and MRI signal intensity of protruded nucleus pulposus . There is no correlation between incident time and the size of protruded nucleus pulposus , protrusiondiscs hight, totle sum of degenerate discs.(2) Between the two groups has a sharp difference in the MRI signal intensity of protruded nucleus pulposus . the group of less than 2 monthes has a lower evalue than the group of exceed 4 monthes . There is less significant between the two groups in the totle sum of degenerate discs.(3)Between the two groups has a sharp difference in the neural root compression degree , thicken ligamenta flava . The group of less than 2 monthes has a high positive rate in neural root compression , thicken ligamenta flava . There is no correlation between the two groups in degeneration degree.Conclusion1. there is correlation between incident time and clinical situation.2. there is correlation between incident time and MRI signal intensity of protruded nucleus pulposus .3. There is no correlation between incident time and the size of protruded nucleus pulposus , protruded discs hight.4. MRI will mae a role in identifying the range of incident time of lumber intervertebral discs protrusion in clinical forensic.