The Study On The Correlation Between SLRT And CT,MRI Imaging In LDH

Lumbar intervertebral disc herniation(LDH) is a common clinical disease. Straight leg raising test has always been one of the most important physical examination in the process of clinical diagnosis of LDH and important diagnostic basis. The mechanism of the SLRT is stretching the sciatic nerve to cause sciatica. With the CT, MRI's appearance and development of medical imaging, imaging diagnosis of LDH has become the main diagnosis.At present, CT,MRI are two most commonly used imaging exzminations and because of their good tissue resolution and multiplanar imaging,the size, location, shape of the disc herniation can be well examined. However,it is found that radicular pain symptoms and signs of many patients are inconsistent with their imaging result. Thus, studies on the correlation between SLRT and imaging size and location of prominent disc are highly concerned by international researchers. Whether it's related to the location and the size of the disc herniation is still controversial.Objective: To investigate the correlation between SLRT and CT,MRI imaging through analysis of clinical information of patients with LDH in order to improve the diagnostic standard of LDH.Methods: 26 patients who were diagnosed of LDH from December 2010 to March 2011 in our hospital were selected. By application of spss17.0, statistical data of 26 LDH cases have been analyzed. In addition to the rachicele rate of salient intercalated disc and position of salient intercalated disc from the iconography (CT MRI), the correlation between the three elements has also been studied. In the end, the research is also involved with analysis of differences among groups of positions of salient intercalated disc and the rachicele rate of single disc herniation and multi disc herniation. Results: Low correlation was found between SLRT and location of hernia in transverse and vertical plane(r横=0.45,P<0.05,r矢=0.41,P<0.05,n=24). The patients with hernias located laterally and latero-centrally were significantly different from hernias located centrally and extro-laterally in SLRT; Axillary root and root-type disc herniation were significantly different from root shoulder-type in SLRT (P<0.05, n=24).Between negative and positive group on the size of the outstanding rate in SLRT of normal side was no differences(P>0.05,n=26). SLRT in degree was different between abnormal and normal side(P<0.05, n=14).No significant was found between SLRT and rachicele rate(r=0.275,P >0.05,n=26). Outstanding rate of spinal canal between the groups which grouped according to the limitation degree of limb elevation was no significant differences(P >0.05,n=26).There was no significant differences between single disc herniation and multi disc herniation(P>0.05, n=24).Conclusion: SLRT associated with the location of disc herniation but there was no relationship with it's size.There was great impact on the SLRT of patients with hernias located laterally and latero-centrally disc herniation. Axillary root and root-type were the same. Meanwhile there was also no significant difference between single disc herniation and multi disc herniation. The relationship between SLR in normal side and negative SLR had some differences, which should be considered. History, clinical manifestation, physical examination, imaging findings and differential diagnosis should be analyzed comprehensively in diagnosis of LDH, which is useful to improve accuracy, avoid missed diagnosis and misdiagnosis, and choose the appropriate therapy.